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Castronovo P, Reale M, Rigter SA, Kagan CR, Murray CB, Lorenzo S, Garnett EC, Schall P, Marino E, Sciortino A, Messina F. Ultrafast Switching of Whispering Gallery Modes in Quantum Dot Superparticles. NANO LETTERS 2025; 25:5828-5835. [PMID: 39991862 DOI: 10.1021/acs.nanolett.5c00643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/25/2025]
Abstract
Microscopic dielectric structures can leverage geometry and photophysics to confine light, acting as microresonators. However, the use of light to reversibly manipulate the spectral pattern of photonic resonances on ultrafast time scales has hardly been explored. Here, we use femtosecond light pulses to drive reversible changes in the photonic resonances of optical microresonators over a broad spectral range. We employ pump-probe microscopy to investigate the dynamic modulation of the photonic response of whispering-gallery microresonator superparticles self-assembled from colloidal quantum dots. Our findings provide crucial insight into the photophysics of semiconductor superstructures, paving the way to their prospective application as ultrafast optical switches for photonics, optoelectronics, and communication technologies. In particular, we demonstrate that ultrafast photoexcitation can initiate ultrafast excitation transfer between neighboring superparticles, forming a dimer, and induce electronically and thermally driven changes in the refractive index of individual superparticles, dynamically modulating their resonances on distinctive time scales.
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Affiliation(s)
- Pietro Castronovo
- Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Marco Reale
- Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Susan A Rigter
- Center for Nanophotonics, AMOLF, Science Park 104, 1098XG Amsterdam, The Netherlands
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Cherie R Kagan
- Department of Chemistry, University of Pennsylvania, 231 S. 34th St., Philadelphia, Pennsylvania 19104, United States
- Department of Materials Science and Engineering, University of Pennsylvania, 220 S 33rd St., Philadelphia, Pennsylvania 19104, United States
- Department of Electrical and Systems Engineering, University of Pennsylvania, 200 S. 33rd Street, Philadelphia, Pennsylvania 19104, United States
| | - Christopher B Murray
- Department of Chemistry, University of Pennsylvania, 231 S. 34th St., Philadelphia, Pennsylvania 19104, United States
- Department of Materials Science and Engineering, University of Pennsylvania, 220 S 33rd St., Philadelphia, Pennsylvania 19104, United States
| | - Salvatore Lorenzo
- Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Erik C Garnett
- Center for Nanophotonics, AMOLF, Science Park 104, 1098XG Amsterdam, The Netherlands
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Peter Schall
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Emanuele Marino
- Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Alice Sciortino
- Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
- ATeN Center - Università degli Studi di Palermo, Viale delle Scienze, Edificio 18, 90128 Palermo, Italy
| | - Fabrizio Messina
- Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
- ATeN Center - Università degli Studi di Palermo, Viale delle Scienze, Edificio 18, 90128 Palermo, Italy
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2
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Barman BK, Yamada H, Watanabe K, Deguchi K, Ohki S, Hashi K, Goto A, Nagao T. Rare-Earth-Metal-Free Solid-State Fluorescent Carbonized-Polymer Microspheres for Unclonable Anti-Counterfeit Whispering-Gallery Emissions from Red to Near-Infrared Wavelengths. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2400693. [PMID: 38867440 PMCID: PMC11321640 DOI: 10.1002/advs.202400693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 04/05/2024] [Indexed: 06/14/2024]
Abstract
Colloidal carbon dots (CDs) have garnered much attention as metal-free photoluminescent nanomaterials, yet creation of solid-state fluorescent (SSF) materials emitting in the deep red (DR) to near-infrared (NIR) range poses a significant challenge with practical implications. To address this challenge and to engineer photonic functionalities, a micro-resonator architecture is developed using carbonized polymer microspheres (CPMs), evolved from conventional colloidal nanodots. Gram-scale production of CPMs utilizes controlled microscopic phase separation facilitated by natural peptide cross-linking during hydrothermal processing. The resulting microstructure effectively suppresses aggregation-induced quenching (AIQ), enabling strong solid-state light emission. Both experimental and theoretical analysis support a role for extended π-conjugated polycyclic aromatic hydrocarbons (PAHs) trapped within these microstructures, which exhibit a progressive red shift in light absorption/emission toward the NIR range. Moreover, the highly spherical shape of CPMs endows them with innate photonic functionalities in combination with their intrinsic CD-based attributes. Harnessing their excitation wavelength-dependent photoluminescent (PL) property, a single CPM exhibits whispering-gallery modes (WGMs) that are emission-tunable from the DR to the NIR. This type of newly developed microresonator can serve as, for example, unclonable anti-counterfeiting labels. This innovative cross-cutting approach, combining photonics and chemistry, offers robust, bottom-up, built-in photonic functionality with diverse NIR applications.
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Affiliation(s)
- Barun Kumar Barman
- Research Center for Materials Nanoarchitectonics (WPI‐MANA)National Institute for Materials Science (NIMS)TsukubaIbaraki305‐0044Japan
| | - Hiroyuki Yamada
- Research Center for Materials Nanoarchitectonics (WPI‐MANA)National Institute for Materials Science (NIMS)TsukubaIbaraki305‐0044Japan
| | - Keisuke Watanabe
- Research Center for Materials Nanoarchitectonics (WPI‐MANA)National Institute for Materials Science (NIMS)TsukubaIbaraki305‐0044Japan
| | - Kenzo Deguchi
- Research Network and Facility Services DivisionNational Institute for Materials Science (NIMS)3‐13 SakuraTsukubaIbaraki305‐0003Japan
| | - Shinobu Ohki
- Research Network and Facility Services DivisionNational Institute for Materials Science (NIMS)3‐13 SakuraTsukubaIbaraki305‐0003Japan
| | - Kenjiro Hashi
- Center for Basic Research on MaterialsNational Institute for Materials Science (NIMS)3‐13 SakuraTsukubaIbaraki305‐0003Japan
| | - Atsushi Goto
- Center for Basic Research on MaterialsNational Institute for Materials Science (NIMS)3‐13 SakuraTsukubaIbaraki305‐0003Japan
| | - Tadaaki Nagao
- Research Center for Materials Nanoarchitectonics (WPI‐MANA)National Institute for Materials Science (NIMS)TsukubaIbaraki305‐0044Japan
- Department of Condensed Matter Physics Graduate School of ScienceHokkaido UniversitySapporoHokkaido060‐0810Japan
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3
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Marino E, LaCour RA, Kodger TE. Emergent Properties from Three-Dimensional Assemblies of (Nano)particles in Confined Spaces. CRYSTAL GROWTH & DESIGN 2024; 24:6060-6080. [PMID: 39044735 PMCID: PMC11261636 DOI: 10.1021/acs.cgd.4c00260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/05/2024] [Accepted: 04/05/2024] [Indexed: 07/25/2024]
Abstract
The assembly of (nano)particles into compact hierarchical structures yields emergent properties not found in the individual constituents. The formation of these structures relies on a profound knowledge of the nanoscale interactions between (nano)particles, which are often designed by researchers aided by computational studies. These interactions have an effect when the (nano)particles are brought into close proximity, yet relying only on diffusion to reach these closer distances may be inefficient. Recently, physical confinement has emerged as an efficient methodology to increase the volume fraction of (nano)particles, rapidly accelerating the time scale of assembly. Specifically, the high surface area of droplets of one immiscible fluid into another facilitates the controlled removal of the dispersed phase, resulting in spherical, often ordered, (nano)particle assemblies. In this review, we discuss the design strategies, computational approaches, and assembly methods for (nano)particles in confined spaces and the emergent properties therein, such as trigger-directed assembly, lasing behavior, and structural photonic color. Finally, we provide a brief outlook on the current challenges, both experimental and computational, and farther afield application possibilities.
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Affiliation(s)
- Emanuele Marino
- Department
of Physics and Chemistry, Università
degli Studi di Palermo, Via Archirafi 36, Palermo 90123, Italy
| | - R. Allen LaCour
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Thomas E. Kodger
- Physical
Chemistry and Soft Matter, Wageningen University
and Research, Stippeneng 4, 6708WE Wageningen, The Netherlands
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4
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Barman BK, Hernández-Pinilla D, Dao TD, Deguchi K, Ohki S, Hashi K, Goto A, Miyazaki T, Nanda KK, Nagao T. Bioinspired Carbonized Polymer Microspheres for Full-Color Whispering Gallery Mode Emission for White Light Emission, Unclonable Anticounterfeiting, and Chemical Sensing Applications. ACS APPLIED MATERIALS & INTERFACES 2024; 16:22312-22325. [PMID: 38651800 DOI: 10.1021/acsami.3c18035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Light-element-based fluorescent materials, colloidal graphene quantum dots, and carbon dots (CDs) have sparked an immense amount of scientific interest in the past decade. However, a significant challenge in practical applications has emerged concerning the development of solid-state fluorescence (SSF) materials. This study addresses this knowledge gap by exploring the unexplored photonic facets of C-based solid-state microphotonic emitters. The proposed synthesis approach focuses on carbonized polymer microspheres (CPMs) instead of conventional nanodots. These microspheres exhibit remarkable SSF spanning the entire visible spectrum from blue to red. The highly spherical shape of CPMs imparts built-in photonic properties in addition to its intrinsic CD-based attributes. Leveraging their excitation-dependent photoluminescence property, these microspheres exhibit amplified spontaneous emission, assisted by the whispering gallery mode resonance across the visible spectral region. Remarkably, unlike conventional semiconductor quantum dots or dye-doped microresonators, this single microstructure showcases adaptable resonant emission without structural/chemical modifications. This distinctive attribute enables a plethora of applications, including microcavity-assisted energy transfer for white light emission, highly sensitive chemical sensing, and secure encrypted anticounterfeiting measures. This interdisciplinary approach, integrating photonics and chemistry, provides a robust solution for light-element-based SSF with inherent photonic functionality and wide-ranging applications.
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Affiliation(s)
- Barun Kumar Barman
- Research Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - David Hernández-Pinilla
- Research Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Thang Duy Dao
- Integrated Photonics Technologies Unit, Microsystems Division, Silicon Austria Laboratories (SAL), Europastraße 12, 9524 Villach, Austria
| | - Kenzo Deguchi
- Research Network and Facility Services Division, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Shinobu Ohki
- Research Network and Facility Services Division, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Kenjiro Hashi
- Center for Basic Research on Materials, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Atsushi Goto
- Center for Basic Research on Materials, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
| | - Tsuyoshi Miyazaki
- Research Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Karuna Kar Nanda
- Institute of Physics, P. O. Sainik School, Bhubaneswar 751005, India
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
| | - Tadaaki Nagao
- Research Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
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5
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Charlton BK, Downie DH, Noman I, Alves PU, Eling CJ, Laurand N. Surface Functionalisation of Self-Assembled Quantum Dot Microlasers with a DNA Aptamer. Int J Mol Sci 2023; 24:14416. [PMID: 37833863 PMCID: PMC10572750 DOI: 10.3390/ijms241914416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 09/18/2023] [Accepted: 09/20/2023] [Indexed: 10/15/2023] Open
Abstract
The surface functionalisation of self-assembled colloidal quantum dot supraparticle lasers with a thrombin binding aptamer (TBA-15) has been demonstrated. The self-assembly of CdSSe/ZnS alloyed core/shell microsphere-shape CQD supraparticles emitting at 630 nm was carried out using an oil-in-water emulsion technique, yielding microspheres with an oleic acid surface and an average diameter of 7.3 ± 5.3 µm. Surface modification of the microspheres was achieved through a ligand exchange with mercaptopropionic acid and the subsequent attachment of TBA-15 using EDC/NHS coupling, confirmed by zeta potential and Fourier transform IR spectroscopy. Lasing functionality between 627 nm and 635 nm was retained post-functionalisation, with oleic acid- and TBA-coated microspheres exhibiting laser oscillation with thresholds as low as 4.10 ± 0.37 mJ·cm-2 and 7.23 ± 0.78 mJ·cm-2, respectively.
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Affiliation(s)
| | | | | | | | | | - Nicolas Laurand
- Technology & Innovation Centre, Institute of Photonics, University of Strathclyde, 99 George Street, Glasgow G1 1RD, UK; (B.K.C.); (D.H.D.); (I.N.); (P.U.A.); (C.J.E.)
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6
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Marino E, Jiang Z, Kodger TE, Murray CB, Schall P. Controlled Assembly of CdSe Nanoplatelet Thin Films and Nanowires. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:12533-12540. [PMID: 37561597 PMCID: PMC10501200 DOI: 10.1021/acs.langmuir.3c00933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/03/2023] [Indexed: 08/12/2023]
Abstract
We assemble semiconductor CdSe nanoplatelets (NPs) at the air/liquid interface into 2D monolayers several micrometers wide, distinctly displaying nematic order. We show that this configuration is the most favorable energetically and that the edge-to-edge distance between neighboring NPs can be tuned by ligand exchange without disrupting film topology and nanoparticle orientation. We explore the rich assembly phase space by using depletion interactions to direct the formation of 1D nanowires from stacks of NPs. The improved control and understanding of the assembly of semiconductor NPs offers opportunities for the development of cheaper optoelectronic devices that rely on 1D or 2D charge delocalization throughout the assembled monolayers and nanowires.
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Affiliation(s)
- Emanuele Marino
- Van
der Waals−Zeeman Institute, University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
- Department
of Chemistry, University of Pennsylvania, 231 S. 34th St., 19104 Philadelphia, (Pennsylvania), United States
- Dipartimento
di Fisica e Chimica, Università degli
Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Zhiqiao Jiang
- Department
of Chemistry, University of Pennsylvania, 231 S. 34th St., 19104 Philadelphia, (Pennsylvania), United States
- Department
of Materials Science and Engineering, University
of Pennsylvania, 3231 Walnut Street, 19104 Philadelphia (Pennsylvania), United States
| | - Thomas E. Kodger
- Van
der Waals−Zeeman Institute, University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
- Physical
Chemistry and Soft Matter, Wageningen University
and Research, Stippeneng 4, 6708WE Wageningen, The Netherlands
| | - Christopher B. Murray
- Department
of Chemistry, University of Pennsylvania, 231 S. 34th St., 19104 Philadelphia, (Pennsylvania), United States
- Department
of Materials Science and Engineering, University
of Pennsylvania, 3231 Walnut Street, 19104 Philadelphia (Pennsylvania), United States
| | - Peter Schall
- Van
der Waals−Zeeman Institute, University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
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7
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Marino E, Rosen DJ, Yang S, Tsai EHR, Murray CB. Temperature-Controlled Reversible Formation and Phase Transformation of 3D Nanocrystal Superlattices Through In Situ Small-Angle X-ray Scattering. NANO LETTERS 2023; 23:4250-4257. [PMID: 37184728 DOI: 10.1021/acs.nanolett.3c00299] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
For decades, the spontaneous organization of nanocrystals into superlattices has captivated the scientific community. However, achieving direct control over the formation of the superlattice and its phase transformations has proven to be a grand challenge, often resulting in the generation of multiple symmetries under the same experimental conditions. Here, we achieve direct control over the formation of the superlattice and its phase transformations by modulating the thermal energy of a nanocrystal dispersion without relying on solvent evaporation. We follow the temperature-dependent dynamics of the self-assembly process using synchrotron-based small-angle X-ray scattering. When cooled below -24.5 °C, lead sulfide nanocrystals form micrometer-sized three-dimensional phase-pure body-centered cubic superlattices. When cooled below -35.1 °C, these superlattices undergo a collective diffusionless phase transformation that yields denser body-centered tetragonal phases. These structural changes can be reversed by increasing the temperature of the dispersion and may lead to the direct modulation of the optical properties of these artificial solids.
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Affiliation(s)
- Emanuele Marino
- Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, Pennslvania 19104 United States
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy
| | - Daniel J Rosen
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104 United States
| | - Shengsong Yang
- Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, Pennslvania 19104 United States
| | - Esther H R Tsai
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Building 735, Upton, New York 11973-5000, United States
| | - Christopher B Murray
- Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, Pennslvania 19104 United States
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104 United States
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8
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Neuhaus SJ, Marino E, Murray CB, Kagan CR. Frequency Stabilization and Optically Tunable Lasing in Colloidal Quantum Dot Superparticles. NANO LETTERS 2023; 23:645-651. [PMID: 36602545 DOI: 10.1021/acs.nanolett.2c04498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Self-assembled superparticles composed of colloidal quantum dots establish microsphere cavities that support optically pumped lasing from whispering gallery modes. Here, we report on the time- and excitation fluence-dependent lasing properties of CdSe/CdS quantum dot superparticles. Spectra collected under constant photoexcitation reveal that the lasing modes are not temporally stable but instead blue-shift by more than 30 meV over 15 min. To counter this effect, we establish a high-fluence light-soaking protocol that reduces this blue-shift by more than an order of magnitude to 1.7 ± 0.5 meV, with champion superparticles displaying mode blue-shifts of <0.5 meV. Increasing the pump fluence allows for optically controlled, reversible, color-tunable red-to-green lasing. Combining these two paradigms suggests that quantum dot superparticles could serve in applications as low-cost, robust, solution-processable, tunable microlasers.
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Affiliation(s)
- Steven J Neuhaus
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
| | - Emanuele Marino
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Via Archirafi 36, 90123Palermo, Italy
| | - Christopher B Murray
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
| | - Cherie R Kagan
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
- Department of Electrical and System Engineering, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
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Chen W, Wang L, Liu R, Shen H, Du J, Fan F. Self-Assembled and Wavelength-Tunable Quantum Dot Whispering-Gallery-Mode Lasers for Backlight Displays. NANO LETTERS 2023; 23:437-443. [PMID: 36630612 DOI: 10.1021/acs.nanolett.2c03409] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Thanks to the narrow line width and high brightness, colloidal quantum dot (CQD) lasers show promising applications in next-generation displays. However, CQD laser-based displays have yet to be demonstrated because of two challenges in integrating red, green, and blue (RGB) lasers: absorption from red CQDs deteriorates the optical gain of blue and green CQDs, and imbalanced white spectra lack blue lasing due to the high lasing threshold of blue CQDs. Herein, we introduce a facile surfactant-free self-assembly method to assemble RGB CQDs into high-quality whispering-gallery-mode (WGM) RGB lasers with close lasing thresholds among them. Moreover, these RGB lasers can lase nearly independently even when they are closely integrated, and they can construct an ultrawide color space whose color gamut is 105% of that of the BT.2020 standard. These combined strategies allow us to demonstrate the first full-color liquid crystal displays using CQD lasers as the backlight source.
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Affiliation(s)
- Weiguo Chen
- Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, Chinese Academy of Sciences Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Lei Wang
- Key Laboratory for Special Functional Materials of Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Henan University, Kaifeng 475004, China
| | - Ruixiang Liu
- Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, Chinese Academy of Sciences Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Huaibin Shen
- Key Laboratory for Special Functional Materials of Ministry of Education, National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology, Henan University, Kaifeng 475004, China
| | - Jiangfeng Du
- Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, Chinese Academy of Sciences Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Fengjia Fan
- Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, Chinese Academy of Sciences Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
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10
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Montaño-Priede JL, Large N. Photonic band structure calculation of 3D-finite nanostructured supercrystals. NANOSCALE ADVANCES 2022; 4:4589-4596. [PMID: 36341288 PMCID: PMC9595189 DOI: 10.1039/d2na00538g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Computational modeling of plasmonic periodic structures are challenging due to their multiscale nature. On one hand, nanoscale building blocks require very fine spatial discretization of the computation domain to describe the near-field nature of the localized surface plasmons. On the other hand, the microscale supercrystals require large simulation domains. To tackle this challenge, two approaches are generally taken: (i) an effective medium approach, neglecting the nanoscale effects and (ii) the use of a unit cell with periodic boundary conditions, neglecting the overall habit of the supercrystal. The latter, which is used to calculate the photonic band structure of these supercrystals, fails to describe the photonic properties arising from their finite-size such as Fabry-Pérot modes (FPMs), whispering gallery modes (WGMs), and decrease of the photonic mode lifetime. Here, we developed a computational approach, based on the finite-difference time-domain method to accurately calculate the photonic band structures of finite supercrystals. We applied this new approach to 3D periodic microstructures of Au nanoparticles with cubic, spherical, and rhombic dodecahedral habits and discuss how their photonic band structures differ from those of infinite structures. Finally, we compared the photonic band structures to reflectance spectra and describe phenomena such as FPMs, WGMs, and polaritonic bandgaps.
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Affiliation(s)
- José Luis Montaño-Priede
- Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle San Antonio Texas 78249 USA
| | - Nicolas Large
- Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle San Antonio Texas 78249 USA
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