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Duan L, Zhang Y, Zhao J, Zhang J, Li Q, Lu Q, Fu L, Liu J, Liu Q. Unique Surface Fluorescence Induced from the Core-Shell Structure of Gallium-Based Liquid Metals Prepared by Thermal Oxidation Processing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:39654-39664. [PMID: 35979950 DOI: 10.1021/acsami.2c12420] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Liquid metals (LMs) have emerged as promising functional materials that combine the properties of both liquid and metal. These characteristics enabled them to find applications in many fields. However, the LMs usually can only display a silver-white physical appearance, which limits their further applications in the fields with the imposition of stringent requirements for color and aesthetics. Herein, we report that the surface of LMs was transformed directly from metal to fluorescent semiconductor layer by an example of eutectic GaInSn (eGaInSn) induced by thermal oxidation. Specifically, a core-shell structure is formed from the fluorescent layer and the LMs. The shell endows the LMs with fluorescence without affecting their interior fluidity and conductivity. In particular, the formation process as well as the degree of crystallization, phase transformation, and light emission of the fluorescent oxide shell on the surface of LMs is regulated by the component content. A thorough analysis of surface morphology, composition, structure, and properties of the fluorescent shell suggests that the Ga2O3 layer is formed on the surface of gallium-based LMs after their immersion in deionized water. Subsequently, thermal oxidation results in the formation of the β-Ga2O3 shell on the surface of liquid metals. Importantly, abundant oxygen vacancies (VO) in β-Ga2O3 as the donors and the gallium vacancies (VGa), gallium-oxygen vacancy pairs (VO-VGa), defect energy levels, and intrinsic defects as the acceptors enabled the light emission. The fluorescent LMs have promising potential for flexible lighting and displays, anticounterfeiting measures, sensing, and chameleon robots.
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Affiliation(s)
- Liangfei Duan
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Yumin Zhang
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Jianhong Zhao
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Jin Zhang
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Qian Li
- CAS Key Laboratory of Cryogenics and Beijing Key Laboratory of Cryo- Biomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Qingjie Lu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Li Fu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Jing Liu
- CAS Key Laboratory of Cryogenics and Beijing Key Laboratory of Cryo- Biomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Department of Biomedical Engineering School of Medicine Tsinghua University, Beijing 100084, China
| | - Qingju Liu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
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2
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Pradhan P, Priya S, Rajendran M, Singh K, Vaidyanathan S. Efficient and ultra-thermally stable Eu 3+ and Sm 3+-activated narrow-band red/deep red-emitting phosphors and their versatile applications. Dalton Trans 2021; 51:715-730. [PMID: 34918724 DOI: 10.1039/d1dt04036g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A succession of Eu3+-activated Na2Y4(WO4)7 (NYW) red phosphors were synthesised and their optical properties were studied in detail for white LED, latent fingerprint and plant growth applications. The phosphors crystallised in a tetragonal system with space group I41/a. The NYW:Eu3+ red phosphors demonstrated a line-like emission at 616 nm owing to electric dipole transition, and a systematic concentration-dependent PL study revealed that concentration quenching occurs at x = 1.8 with a color purity of 96.06%. The thermal stability and internal quantum efficiency of the phosphor were found to be ∼75.54% (at 423 K) and 88%, respectively. Furthermore, solid solution phosphors were synthesized to increase QE, which was found to be 91.27%. Specifically, the hybrid white LED exhibits warm white light with high CRI (80) and low CCT (5730 K) values, and these values are further improved (CRI-81, CCT-4274 K) when the WLED is fabricated using the most efficient solid solution phosphor Na2Y2.2Eu1.8(WO4)3(MoO4)4. The currently synthesized phosphors can be potential candidates for security applications. The selected phosphor compositions can be used for the detection of latent fingerprints. Besides, a succession of Eu3+ and Sm3+ co-doped phosphors were synthesized and their photophysical properties were studied systematically. The deep red LED was fabricated using the same and this could be a possible light source for plant growth usage.
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Affiliation(s)
| | - Savita Priya
- Department of Chemistry, National Institute of Technology, Rourkela, India.
| | | | - Kasturi Singh
- Department of Chemistry, National Institute of Technology, Rourkela, India.
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Gomes dos Santos A, Arab M, Pereira de Souza C, Leroux C. New cation deficient scheelites (Sr,Ce)nWO4 (n<1): Structural and optical properties. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.121981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Gupta SK, Kadam R, Pujari P. Lanthanide spectroscopy in probing structure-property correlation in multi-site photoluminescent phosphors. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213405] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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6
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Gupta SK, Mao Y. Recent advances, challenges, and opportunities of inorganic nanoscintillators. FRONTIERS OF OPTOELECTRONICS 2020; 13:156-187. [PMID: 36641550 PMCID: PMC9743955 DOI: 10.1007/s12200-020-1003-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 03/19/2020] [Indexed: 05/11/2023]
Abstract
This review article highlights the exploration of inorganic nanoscintillators for various scientific and technological applications in the fields of radiation detection, bioimaging, and medical theranostics. Various aspects of nanoscintillators pertaining to their fundamental principles, mechanism, structure, applications are briefly discussed. The mechanisms of inorganic nanoscintillators are explained based on the fundamental principles, instrumentation involved, and associated physical and chemical phenomena, etc. Subsequently, the promise of nanoscintillators over the existing single-crystal scintillators and other types of scintillators is presented, enabling their development for multifunctional applications. The processes governing the scintillation mechanisms in nanodomains, such as surface, structure, quantum, and dielectric confinement, are explained to reveal the underlying nanoscale scintillation phenomena. Additionally, suitable examples are provided to explain these processes based on the published data. Furthermore, we attempt to explain the different types of inorganic nanoscintillators in terms of the powder nanoparticles, thin films, nanoceramics, and glasses to ensure that the effect of nanoscience in different nanoscintillator domains can be appreciated. The limitations of nanoscintillators are also highlighted in this review article. The advantages of nanostructured scintillators, including their property-driven applications, are also explained. This review article presents the considerable application potential of nanostructured scintillators with respect to important aspects as well as their physical and application significance in a concise manner.
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Affiliation(s)
- Santosh K Gupta
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Yuanbing Mao
- Department of Chemistry, Illinois Institute of Technology, Chicago, IL, 60616, USA.
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7
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Das D, Gupta SK, Datrik CS, Nandi P, Sudarshan K. Role of alkali charge compensation in the luminescence of CaWO4:Nd3+ and SrWO4:Nd3+ Scheelites. NEW J CHEM 2020. [DOI: 10.1039/d0nj00651c] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work demonstrates the distinct role of alkali metal ion charge compensators on the luminescence of NIR-emitting Nd3+ Scheelite. The unit cell dimensions of the host lattice and excitation wavelength play a very important role.
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Affiliation(s)
- Debarati Das
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - C. S. Datrik
- Product Development Section
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. Nandi
- Glass and Advanced Ceramics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - K. Sudarshan
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
- Homi Bhabha National Institute
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Das D, Gupta SK, Srivastava AP, Utpalla P, Sudarshan K. Probing emission and defects in BaWxMo1–xO4 solid solutions: achieving color tunable luminescence by W/Mo ratio and size manipulation. NEW J CHEM 2020. [DOI: 10.1039/d0nj01824d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
This work highlights the size, structure, and composition manipulation for designing color-tunable phosphors based on doped scheelite micro- and nanocrystals.
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Affiliation(s)
- Debarati Das
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | | | - A. P. Srivastava
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - P. Utpalla
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | - K. Sudarshan
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
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9
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Dirany N, Hallaoui A, Valmalette JC, Arab M. Effect of morphology and temperature treatment control on the photocatalytic and photoluminescence properties of SrWO4 crystals. Photochem Photobiol Sci 2020; 19:235-250. [DOI: 10.1039/c9pp00331b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work reports the combined effect of the morphology and crystallization degree of the strontium tungstate (SrWO4) scheelite structure on its photocatalytic and photoluminescence properties.
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Affiliation(s)
- Nadine Dirany
- Université de Toulon
- Aix Marseille Univ
- CNRS
- IM2NP
- Toulon Cedex 9
| | | | | | - Madjid Arab
- Université de Toulon
- Aix Marseille Univ
- CNRS
- IM2NP
- Toulon Cedex 9
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10
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Gupta S, Abdou M, Ghosh PS, Zuniga JP, Mao Y. Thermally Induced Disorder-Order Phase Transition of Gd 2Hf 2O 7:Eu 3+ Nanoparticles and Its Implication on Photo- and Radioluminescence. ACS OMEGA 2019; 4:2779-2791. [PMID: 31459510 PMCID: PMC6648517 DOI: 10.1021/acsomega.8b03458] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 01/17/2019] [Indexed: 05/23/2023]
Abstract
Crystal structure has a strong influence on the luminescence properties of lanthanide-doped materials. In this work, we have investigated the thermally induced structural transition in Gd2Hf2O7 (GHO) using Eu3+ ions as the spectroscopic probe. It was found that complete phase transition from the disordered fluorite phase (DFP) to the ordered pyrochlore phase (OPP) can be achieved in GHO with the increase of annealing temperature from 650 → 1100 → 1300 °C. OPP is the more stable structural form for the GHOE nanoparticles (NPs) annealed at a higher temperature based on the energy calculation by density functional theory (DFT). The asymmetry ratio of the GHOE-650 NPs was the highest, whereas the quantum yield, luminescence intensity, and lifetime values of the GHOE-1300 NPs were the highest. Emission intensity of Eu3+ ions increases significantly with the phase transition from the DFP to OPP phase and is attributed to the higher radiative transition rate (281 s-1) of the 5D0 level of the Eu3+ ion in the environment with relatively lower symmetry (C 2v ) because of the increase of crystal size. As the structure changes from DFP to OPP, radioluminescence showed tunable color change from red to orange. The Eu3+ local structure obtained from DFT calculation confirmed the absence of inversion symmetry in the DFP structure, which is consistent with the experimental emission spectra and Stark components. We also elucidated the host to dopant optical energy transfer through density of states calculations. Overall, our current studies present important observations for the GHOE NPs: (i) thermally induced order-disorder phase transition, (ii) change of point group symmetry around Eu3+ ions in the two phases, (iii) high thermal stability, and (iv) tunability of radioluminescent color. This work provides fundamental understanding of the relationship between the crystal structure and photophysical properties of lanthanide-doped materials and helps design a strategy for advanced optoelectronic materials.
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Affiliation(s)
- Santosh
K. Gupta
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
- Radiochemistry Division and Materials Science
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Maya Abdou
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
| | - Partha Sarathi Ghosh
- Radiochemistry Division and Materials Science
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Jose P. Zuniga
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
| | - Yuanbing Mao
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
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11
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Huang J, Lu W, Yue D, Wang Y, Wang Z, Jin L, Zhang L, Li Z. Controllable synthesis of multi-morphological SrWO 4:Ln 3+ (Ln = Eu, Tb) hierarchical structures and their luminescence properties. CrystEngComm 2019. [DOI: 10.1039/c9ce01111k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Multi-morphological SrWO4:Ln3+ hierarchical structures including dumbbell-like, nanosheets, rice-like, peanut-like, etc. could be controllably synthesized through readily altering reaction conditions.
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Affiliation(s)
- Jingbin Huang
- Center of Analysis and Testing
- College of Material and Chemical Engineering
- Henan University of Engineering
- Xinzheng 451191
- P. R. China
| | - Wei Lu
- University Research Facility in Materials Characterization and Device Fabrication
- The Hong Kong Polytechnic University
- Hong Kong
- P. R. China
| | - Dan Yue
- Center of Analysis and Testing
- College of Material and Chemical Engineering
- Henan University of Engineering
- Xinzheng 451191
- P. R. China
| | - Yanyan Wang
- Center of Analysis and Testing
- College of Material and Chemical Engineering
- Henan University of Engineering
- Xinzheng 451191
- P. R. China
| | - Zhenling Wang
- Center of Analysis and Testing
- College of Material and Chemical Engineering
- Henan University of Engineering
- Xinzheng 451191
- P. R. China
| | - Lin Jin
- Henan Key Laboratory of Rare Earth Functional Materials
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Lianzhong Zhang
- Henan Provincial People's Hospital
- Zhengzhou University People's Hospital
- Zhengzhou 450003
- P. R. China
| | - Zhongjun Li
- The College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
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12
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Gupta SK, Zuniga JP, Ghosh PS, Abdou M, Mao Y. Correlating Structure and Luminescence Properties of Undoped and Eu 3+-Doped La 2Hf 2O 7 Nanoparticles Prepared with Different Coprecipitating pH Values through Experimental and Theoretical Studies. Inorg Chem 2018; 57:11815-11830. [PMID: 30178662 DOI: 10.1021/acs.inorgchem.8b01983] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the structure-property relationship and optimizing properties of phosphors for use in lighting and scintillation fields is an important materials challenge. In this work, we investigated the effects of the pH value of the coprecipitating solution adjusted by the concentration of NH4OH(aq) on the structure and optical properties of the obtained La2Hf2O7 nanoparticles (NPs). The obtained NPs stabilize in the ideal pyrochlore structure, but the extent of ordering increased with an increase in the pH value used. The NPs prepared at pH = 12.1 displayed the best optical performance owing to the balance of the crystallinity, agglomeration, and surface defects. On the basis of density functional theory (DFT) calculations, the origin of violet-blue emission in undoped La2Hf2O7 NPs was attributed to defect states in the electronic band gap arising due to oxygen defects. For the La2Hf2O7:Eu3+ NPs, the Eu3+ dopants possess low symmetry and their occupancy is more favorable at the LaO8 site. DFT calculations further justify the complete host-to-dopant energy transfer and origin of the most intense red emission observed experimentally. Understanding the interplay of the experimental and theoretical results thus is a very useful general approach for improving the efficiency of luminescent materials.
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13
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Zuniga JP, Gupta SK, Abdou M, Mao Y. Effect of Molten Salt Synthesis Processing Duration on the Photo- and Radioluminescence of UV-, Visible-, and X-ray-Excitable La 2Hf 2O 7:Eu 3+ Nanoparticles. ACS OMEGA 2018; 3:7757-7770. [PMID: 31458923 PMCID: PMC6644486 DOI: 10.1021/acsomega.8b00987] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Accepted: 06/20/2018] [Indexed: 05/06/2023]
Abstract
Ln3+-ion-doped nanomaterials possess excellent properties because of their high color purity, longer excited state lifetime, narrow emission, and large Stokes shifts. In this work, we studied the correlation between the luminescence properties of La2Hf2O7:Eu3+ pyrochlore nanoparticles (NPs) synthesized by a molten salt synthesis (MSS) method at a relatively low temperature and several MSS processing durations (from 1 to 12 h). We synthesized these NPs with different sizes just by changing the MSS processing time without subjecting to high temperature. Raman spectroscopy confirmed the stabilization of the ideal pyrochlore structure of the La2Hf2O7:Eu3+ NPs at various MSS processing durations. The synthesized NPs exhibited bright red emission under UV, visible, and X-ray excitations, highlighting their potential applications as a red phosphor and scintillator. As the MSS processing time was increased from 1 to 12 h, a spectral change in the position of the charge transfer state in the La2Hf2O7:Eu3+ NPs was observed. The sample processed by the MSS with a duration of 3 h exhibited the highest luminescence intensity, which was attributed to its optimum crystals with least surface defects and less agglomeration. The obtained results strongly and unambiguously indicate the brighter side of this new type of pyrochlore-based NPs in the fast growing field of solid-state lighting and scintillator materials.
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Affiliation(s)
- Jose P. Zuniga
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University
Drive, Edinburg, Texas 78539, United States
| | - Santosh K. Gupta
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University
Drive, Edinburg, Texas 78539, United States
- Radiochemistry
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Maya Abdou
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University
Drive, Edinburg, Texas 78539, United States
| | - Yuanbing Mao
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University
Drive, Edinburg, Texas 78539, United States
- E-mail: . Tel: +1-956-665-2986
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14
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Gupta SK, Sudarshan K, Yadav AK, Gupta R, Bhattacharyya D, Jha SN, Kadam RM. Deciphering the Role of Charge Compensator in Optical Properties of SrWO4:Eu3+:A (A = Li+, Na+, K+): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption. Inorg Chem 2018; 57:821-832. [DOI: 10.1021/acs.inorgchem.7b02780] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Santosh Kumar Gupta
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Kathi Sudarshan
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Ashok Kumar Yadav
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Ruma Gupta
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Dibyendu Bhattacharyya
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Shambhu Nath Jha
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Ramakant Mahadeo Kadam
- Radiochemistry
Division, ‡Atomic and Molecular Physics Division, and §Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
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15
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Huang J, Tian B, Wang J, Wang Y, Lu W, Li Q, Jin L, Li C, Wang Z. Controlled synthesis of 3D flower-like MgWO4:Eu3+ hierarchical structures and fluorescence enhancement through introduction of carbon dots. CrystEngComm 2018. [DOI: 10.1039/c7ce02048a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
3D flower-like MgWO4:Eu3+ structures composed of many nanosheets were synthesized and their luminescence can be enhanced through introduction of CDs.
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Affiliation(s)
- Jingbin Huang
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Boshi Tian
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Jia Wang
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Yabo Wang
- College of Chemistry and Environmental Engineering
- Pingdingshan University
- Pingdingshan 467000
- P. R. China
| | - Wei Lu
- University Research Facility in Materials Characterization and Device Fabrication
- The Hong Kong Polytechnic University
- Hong Kong
- P. R. China
| | - Qingfeng Li
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Lin Jin
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Chunyang Li
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
| | - Zhenling Wang
- The Henan Key Laboratory of Rare Earth Functional Materials
- The Key Laboratory of Rare Earth Functional Materials and Applications
- Zhoukou Normal University
- Zhoukou 466001
- P. R. China
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Gupta SK, Zuniga JP, Abdou M, Mao Y. Thermal annealing effects on La2Hf2O7:Eu3+ nanoparticles: a curious case study of structural evolution and site-specific photo- and radio-luminescence. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00713f] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High temperature annealed La2Hf2O7:Eu3+ nanoparticles favor tunneling of Eu3+ to symmetric sites showing orange emission, whereas low temperature annealed samples favor red emission.
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Affiliation(s)
- Santosh K. Gupta
- Department of Chemistry
- University of Texas Rio Grande Valley
- Edinburg
- USA
- Radiochemistry Division
| | - Jose P. Zuniga
- Department of Chemistry
- University of Texas Rio Grande Valley
- Edinburg
- USA
| | - Maya Abdou
- Department of Chemistry
- University of Texas Rio Grande Valley
- Edinburg
- USA
| | - Yuanbing Mao
- Department of Chemistry
- University of Texas Rio Grande Valley
- Edinburg
- USA
- School of Earth
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17
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Zhang Y, Ding B, Yin L, Xin J, Zhao R, Zheng S, Yan X. Monoclinic Lu2–xSmxWO6-Based White Light-Emitting Phosphors: From Ground–Excited-States Calculation Prediction to Experiment Realization. Inorg Chem 2017; 57:507-518. [DOI: 10.1021/acs.inorgchem.7b02787] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Luqiao Yin
- Key Laboratory of Advanced Display and System Applications, Shanghai University, Ministry of Education, Shanghai, 200444, China
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19
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Jena P, Gupta SK, Verma NK, Singh AK, Kadam RM. Energy transfer dynamics and time resolved photoluminescence in BaWO4:Eu3+ nanophosphors synthesized by mechanical activation. NEW J CHEM 2017. [DOI: 10.1039/c7nj01249g] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Red purity and high quantum efficiency of BaWO4:Eu3+ projects it as a new red phosphor for application in white LEDs.
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Affiliation(s)
- Paramananda Jena
- School of Materials Science and Technology
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Narendra Kumar Verma
- School of Materials Science and Technology
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - Akhilesh Kumar Singh
- School of Materials Science and Technology
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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20
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Gupta SK, Ghosh PS, Pathak N, Kadam RM. Why host to dopant energy transfer is absent in the MgAl2O4:Eu3+ spinel? And exploring Eu3+ site distribution and local symmetry through its photoluminescence: interplay of experiment and theory. RSC Adv 2016. [DOI: 10.1039/c6ra03369e] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Local site occupancy of Eu3+ in combustion synthesized MgAl2O4 spinel and host → Eu3+ energy transfer dynamics is investigated using photoluminescence and DFT calculations.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. S. Ghosh
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Nimai Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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21
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Gupta SK, Ghosh PS, Reghukumar C, Pathak N, Kadam RM. Experimental and theoretical approach to account for green luminescence from Gd2Zr2O7 pyrochlore: exploring the site occupancy and origin of host-dopant energy transfer in Gd2Zr2O7:Eu3+. RSC Adv 2016. [DOI: 10.1039/c6ra05113h] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Origin of green emission in undoped Gd2Zr2O7 and photophysical characteristics such as local site and energy transfer dynamics of Gd2Zr2O7:Eu3+ is investigated using PL and DFT calculations.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. S. Ghosh
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - C. Reghukumar
- Institute of Science Education and Research Centre
- Santiniketan
- India
| | - N. Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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22
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Gupta SK, Reghukumar C, Kadam RM. Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties. RSC Adv 2016. [DOI: 10.1039/c6ra11698a] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
New Color tunable Nd2Zr2O7:Eu3+ (0–5 mol%) phosphor was synthesized using gel-combustion and its photophysical characteristics such as energy transfer, point group symmetry and Judd–Ofelt parameter were investigated using time resolved photoluminescence.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - C. Reghukumar
- Institute of Science Education and Research Centre
- Santiniketan
- India
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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