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Wang S, Dyksik M, Lampe C, Gramlich M, Maude DK, Baranowski M, Urban AS, Plochocka P, Surrente A. Thickness-Dependent Dark-Bright Exciton Splitting and Phonon Bottleneck in CsPbBr 3-Based Nanoplatelets Revealed via Magneto-Optical Spectroscopy. Nano Lett 2022; 22:7011-7019. [PMID: 36036573 PMCID: PMC9479212 DOI: 10.1021/acs.nanolett.2c01826] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The optimized exploitation of perovskite nanocrystals and nanoplatelets as highly efficient light sources requires a detailed understanding of the energy spacing within the exciton manifold. Dark exciton states are particularly relevant because they represent a channel that reduces radiative efficiency. Here, we apply large in-plane magnetic fields to brighten optically inactive states of CsPbBr3-based nanoplatelets for the first time. This approach allows us to access the dark states and directly determine the dark-bright splitting, which reaches 22 meV for the thinnest nanoplatelets. The splitting is significantly less for thicker nanoplatelets due to reduced exciton confinement. Additionally, the form of the magneto-PL spectrum suggests that dark and bright state populations are nonthermalized, which is indicative of a phonon bottleneck in the exciton relaxation process.
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Affiliation(s)
- Shuli Wang
- Laboratoire
National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228,
Université Grenoble Alpes, Université
Toulouse, Université Toulouse 3, INSA-T, 38042 Grenoble
and 31400 Toulouse, France
| | - Mateusz Dyksik
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Carola Lampe
- Nanospectroscopy
Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München (LMU), Munich 80539 Germany
| | - Moritz Gramlich
- Nanospectroscopy
Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München (LMU), Munich 80539 Germany
| | - Duncan K. Maude
- Laboratoire
National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228,
Université Grenoble Alpes, Université
Toulouse, Université Toulouse 3, INSA-T, 38042 Grenoble
and 31400 Toulouse, France
| | - Michał Baranowski
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Alexander S. Urban
- Nanospectroscopy
Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München (LMU), Munich 80539 Germany
| | - Paulina Plochocka
- Laboratoire
National des Champs Magnétiques Intenses, EMFL, CNRS UPR 3228,
Université Grenoble Alpes, Université
Toulouse, Université Toulouse 3, INSA-T, 38042 Grenoble
and 31400 Toulouse, France
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Alessandro Surrente
- Department
of Experimental Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
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2
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Greiner MG, Singldinger A, Henke NA, Lampe C, Leo U, Gramlich M, Urban AS. Energy Transfer in Stability-Optimized Perovskite Nanocrystals. Nano Lett 2022; 22:6709-6715. [PMID: 35939043 DOI: 10.1021/acs.nanolett.2c02108] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Outstanding optoelectronic properties and a facile synthesis render halide perovskite nanocrystals (NCs) a promising material for nanostructure-based devices. However, the commercialization is hindered mainly by the lack of NC stability under ambient conditions and inefficient charge carrier injection. Here, we investigate solutions to both problems, employing methylammonium lead bromide (MAPbBr3) NCs encapsulated in diblock copolymer core-shell micelles of tunable size. We confirm that the shell does not prohibit energy transfer, as FRET efficiencies between these NCs and 2D CsPbBr3 nanoplatelets (NPLs) reach 73.6%. This value strongly correlates to the micelle size, with thicker shells displaying significantly reduced FRET efficiencies. Those high efficiencies come with a price, as the thinnest shells protect the encapsulated NCs less from environmentally induced degradation. Finding the sweet spot between efficiency and protection could lead to the realization of tailored energy funnels with enhanced carrier densities for high-power perovskite NC-based optoelectronic applications.
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Affiliation(s)
- Michèle G Greiner
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
| | - Andreas Singldinger
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
| | - Nina A Henke
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
| | - Carola Lampe
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
| | - Ulrich Leo
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
| | - Moritz Gramlich
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
| | - Alexander S Urban
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstraße 10, 80539 Munich, Germany
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3
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Zink MD, Hermans B, Gramlich M, Philippens SAM, Vernooy K, Van Hunnik A, Linz DK, Zeemering S, Schotten U. BMP10 level helps to stratify risk of atrial fibrillation recurrence within one year after catheter ablation. Europace 2022. [DOI: 10.1093/europace/euac053.171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: Public Institution(s). Main funding source(s): DGK Electrophysiology grant
Background
Freedom of atrial fibrillation (AF) is the main purpose of catheter ablation. However, AF recurrence is commonly seen after catheter ablation. Cardiovascular biomarkers may help to identify patients at risk for AF recurrence.
Purpose
We investigated the association of preprocedural known and novel cardiovascular biomarker level with AF recurrence within one year after catheter ablation.
Methods
In 187 patients of the AFAB registry (University Maastricht, the Netherlands) clinical recurrence of AF after catheter ablation was investigated using Holter ECGs at 3- and 12-months follow-up. Blood samples taken before AF catheter ablation were analyzed for prediction of AF recurrence by known or novel cardiovascular biomarkers (FGF23, BMP10, Ang2, IGFBP7, CA125, NT-proBNP, TNT_hs, sFlt_1, ESM1_7F89A5, DKK3). Recurrence of AF was defined as any symptomatic, or ECG documented episode of AF within one year after catheter ablation. A logistic regression model adjusted for typical risk factors of AF recurrence (Sex, age, type of AF (paroxysmal or persistent), ongoing rhythm, LA diameter, heart failure, body mass index and hypertension) was calculated and receiver-operating analysis was performed for prediction of AF recurrence.
Results
AF recurrence was found in 86 patients within one year after catheter ablation. Elevated biomarker level in patients with AF recurrence were found for BMP10, Ang2, and NT-proBNP in univariate analysis (table 1). In the logistic regression BMP10 (Odds ratio 2.94, 95%CI 1.089-7.939, P=0.033) indicated a high probability of AF recurrence within one year. A model including factors of AF recurrence showed a predictability for AF recurrence of an area under the curve (AUC) of 0.68 (sensitivity 60%, specificity 64%). By adding each of the univariate significant biomarker the predictability of the model increases further Ang2 (AUC 0.69, sensitivity 69%, specificity 60%), NT-proBNP (AUC 0.69, sensitivity 65%, specificity 60%), and BMP10 (AUC 0.71, sensitivity 60%, specificity 73%).
Conclusions
Based on our data, Ang2, BMP10, NT-proBNP showed elevated values for patients with recurrence of AF within one year before catheter ablation. BMP10, which is likely associated with trabeculation of the heart, outperformed the other investigated known and novel biomarker indicating a higher probability of AF recurrence within one year after ablation.
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Affiliation(s)
- MD Zink
- RWTH University Hospital Aachen, Internal Medicine I, Cardiology, Pulmonology & Vascular Medicine, Aachen, Germany
| | - B Hermans
- Cardiovascular Research Institute Maastricht (CARIM), Physiology, Maastricht, Netherlands (The)
| | - M Gramlich
- RWTH University Hospital Aachen, Internal Medicine I, Cardiology, Pulmonology & Vascular Medicine, Aachen, Germany
| | - SAM Philippens
- Maastricht University Medical Centre (MUMC), Cardiology, Maastricht, Netherlands (The)
| | - K Vernooy
- Maastricht University Medical Centre (MUMC), Cardiology, Maastricht, Netherlands (The)
| | - A Van Hunnik
- Cardiovascular Research Institute Maastricht (CARIM), Physiology, Maastricht, Netherlands (The)
| | - DK Linz
- Cardiovascular Research Institute Maastricht (CARIM), Physiology, Maastricht, Netherlands (The)
| | - S Zeemering
- Cardiovascular Research Institute Maastricht (CARIM), Physiology, Maastricht, Netherlands (The)
| | - U Schotten
- Cardiovascular Research Institute Maastricht (CARIM), Physiology, Maastricht, Netherlands (The)
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4
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Gramlich M, Swift MW, Lampe C, Lyons JL, Döblinger M, Efros AL, Sercel PC, Urban AS. Dark and Bright Excitons in Halide Perovskite Nanoplatelets. Adv Sci (Weinh) 2022; 9:e2103013. [PMID: 34939751 PMCID: PMC8844578 DOI: 10.1002/advs.202103013] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 10/13/2021] [Indexed: 05/22/2023]
Abstract
Semiconductor nanoplatelets (NPLs), with their large exciton binding energy, narrow photoluminescence (PL), and absence of dielectric screening for photons emitted normal to the NPL surface, could be expected to become the fastest luminophores amongst all colloidal nanostructures. However, super-fast emission is suppressed by a dark (optically passive) exciton ground state, substantially split from a higher-lying bright (optically active) state. Here, the exciton fine structure in 2-8 monolayer (ML) thick Csn - 1 Pbn Br3n + 1 NPLs is revealed by merging temperature-resolved PL spectra and time-resolved PL decay with an effective mass model taking quantum confinement and dielectric confinement anisotropy into account. This approach exposes a thickness-dependent bright-dark exciton splitting reaching 32.3 meV for the 2 ML NPLs. The model also reveals a 5-16 meV splitting of the bright exciton states with transition dipoles polarized parallel and perpendicular to the NPL surfaces, the order of which is reversed for the thinnest NPLs, as confirmed by TR-PL measurements. Accordingly, the individual bright states must be taken into account, while the dark exciton state strongly affects the optical properties of the thinnest NPLs even at room temperature. Significantly, the derived model can be generalized for any isotropically or anisotropically confined nanostructure.
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Affiliation(s)
- Moritz Gramlich
- Nanospectroscopy GroupNano‐Institute MunichDepartment of PhysicsLudwig‐Maximilians‐Universität München (LMU)Munich80539Germany
| | - Michael W. Swift
- Center for Computational Materials ScienceU.S. Naval Research LaboratoryWashington D.C.20375USA
| | - Carola Lampe
- Nanospectroscopy GroupNano‐Institute MunichDepartment of PhysicsLudwig‐Maximilians‐Universität München (LMU)Munich80539Germany
| | - John L. Lyons
- Center for Computational Materials ScienceU.S. Naval Research LaboratoryWashington D.C.20375USA
| | - Markus Döblinger
- Department of ChemistryLudwig‐Maximilians‐Universität München (LMU) & Center for NanoScience (CeNS)Munich81377Germany
| | - Alexander L. Efros
- Center for Computational Materials ScienceU.S. Naval Research LaboratoryWashington D.C.20375USA
| | - Peter C. Sercel
- Center for Hybrid Organic Inorganic Semiconductors for EnergyGoldenCO80401USA
| | - Alexander S. Urban
- Nanospectroscopy GroupNano‐Institute MunichDepartment of PhysicsLudwig‐Maximilians‐Universität München (LMU)Munich80539Germany
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5
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Gramlich M, Lampe C, Drewniok J, Urban AS. How Exciton-Phonon Coupling Impacts Photoluminescence in Halide Perovskite Nanoplatelets. J Phys Chem Lett 2021; 12:11371-11377. [PMID: 34791883 DOI: 10.1021/acs.jpclett.1c03437] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Semiconductor nanocrystals are receiving increased interest as narrow-band emitters for display applications. Here, we investigate the underlying photoluminescence (PL) linewidth broadening mechanisms in thickness-tunable 2D halide perovskite (Csn-1PbnBr3n+1) nanoplatelets (NPLs). Temperature-dependent PL spectroscopy on NPL thin films reveals a blue-shift of the PL maximum for thicker NPLs, no shift for three monolayer (ML) thick NPLs, and a red-shift for the thinnest (2 ML) NPLs with increasing temperature. Emission linewidths also strongly depend on NPL thickness, with the thinnest NPLs showing the smallest temperature-induced broadening. We determine the combined interaction of exciton-phonon coupling and thermal lattice expansion to be responsible for both effects. Additionally, the 2 ML NPLs exhibit a significantly larger Fröhlich coupling constant and optical phonon energy, possibly due to an inversion in the exciton fine structure. These results illustrate that ultrathin halide perovskite NPLs could illuminate the next generation of displays, provided a slightly greater sample homogeneity and improved stability.
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Affiliation(s)
- Moritz Gramlich
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstr. 10, 80539 Munich, Germany
| | - Carola Lampe
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstr. 10, 80539 Munich, Germany
| | - Jan Drewniok
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstr. 10, 80539 Munich, Germany
| | - Alexander S Urban
- Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstr. 10, 80539 Munich, Germany
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6
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Gramlich M, Bohn BJ, Tong Y, Polavarapu L, Feldmann J, Urban AS. Thickness-Dependence of Exciton-Exciton Annihilation in Halide Perovskite Nanoplatelets. J Phys Chem Lett 2020; 11:5361-5366. [PMID: 32536167 DOI: 10.1021/acs.jpclett.0c01291] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Exciton-exciton annihilation (EEA) and Auger recombination are detrimental processes occurring in semiconductor optoelectronic devices at high carrier densities. Despite constituting one of the main obstacles for realizing lasing in semiconductor nanocrystals (NCs), the dependencies on NC size are not fully understood, especially for those with both weakly and strongly confined dimensions. Here, we use differential transmission spectroscopy to investigate the dependence of EEA on the physical dimensions of thickness-controlled 2D halide perovskite nanoplatelets (NPls). We find the EEA lifetimes to be extremely short on the order of 7-60 ps. Moreover, they are strongly determined by the NPl thickness with a power law dependence according to τ2 ∝ d5.3. Additional measurements show that the EEA lifetimes also increase for NPls with larger lateral dimensions. These results show that a precise control of the physical dimensions is critical for deciphering the fundamental laws governing the process especially in 1D and 2D NCs.
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Affiliation(s)
- Moritz Gramlich
- Nanospectroscopy Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
| | - Bernhard J Bohn
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
| | - Yu Tong
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
| | - Lakshminarayana Polavarapu
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
| | - Jochen Feldmann
- Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
| | - Alexander S Urban
- Nanospectroscopy Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität, Munich 80539, Germany
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7
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Singldinger A, Gramlich M, Gruber C, Lampe C, Urban AS. Nonradiative Energy Transfer between Thickness-Controlled Halide Perovskite Nanoplatelets. ACS Energy Lett 2020; 5:1380-1385. [PMID: 32421025 PMCID: PMC7216487 DOI: 10.1021/acsenergylett.0c00471] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 04/01/2020] [Indexed: 05/04/2023]
Abstract
Despite showing great promise for optoelectronics, the commercialization of halide perovskite nanostructure-based devices is hampered by inefficient electrical excitation and strong exciton binding energies. While transport of excitons in an energy-tailored system via Förster resonance energy transfer (FRET) could be an efficient alternative, halide ion migration makes the realization of cascaded structures difficult. Here, we show how these could be obtained by exploiting the pronounced quantum confinement effect in two-dimensional CsPbBr3-based nanoplatelets (NPls). In thin films of NPls of two predetermined thicknesses, we observe an enhanced acceptor photoluminescence (PL) emission and a decreased donor PL lifetime. This indicates a FRET-mediated process, benefitted by the structural parameters of the NPls. We determine corresponding transfer rates up to k FRET = 0.99 ns-1 and efficiencies of nearly ηFRET = 70%. We also show FRET to occur between perovskite NPls of other thicknesses. Consequently, this strategy could lead to tailored energy cascade nanostructures for improved optoelectronic devices.
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Affiliation(s)
| | | | | | | | - Alexander S. Urban
- . Website: www.nanospec.de. Twitter: @NanospecGroup. Instagram: @nanospecgroup
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8
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Hintermayr V, Lampe C, Löw M, Roemer J, Vanderlinden W, Gramlich M, Böhm AX, Sattler C, Nickel B, Lohmüller T, Urban AS. Polymer Nanoreactors Shield Perovskite Nanocrystals from Degradation. Nano Lett 2019; 19:4928-4933. [PMID: 31322894 PMCID: PMC6892581 DOI: 10.1021/acs.nanolett.9b00982] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 07/12/2019] [Indexed: 05/20/2023]
Abstract
Halide perovskite nanocrystals (NCs) have shown impressive advances, exhibiting optical properties that outpace conventional semiconductor NCs, such as near-unity quantum yields and ultrafast radiative decay rates. Nevertheless, the NCs suffer even more from stability problems at ambient conditions and due to moisture than their bulk counterparts. Herein, we report a strategy of employing polymer micelles as nanoreactors for the synthesis of methylammonium lead trihalide perovskite NCs. Encapsulated by this polymer shell, the NCs display strong stability against water degradation and halide ion migration. Thin films comprising these NCs exhibit a more than 15-fold increase in lifespan in comparison to unprotected NCs in ambient conditions and even survive over 75 days of complete immersion in water. Furthermore, the NCs, which exhibit quantum yields of up to 63% and tunability of the emission wavelength throughout the visible range, show no signs of halide ion exchange. Additionally, heterostructures of MAPI and MAPBr NC layers exhibit efficient Förster resonance energy transfer (FRET), revealing a strategy for optoelectronic integration.
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Affiliation(s)
- Verena
A. Hintermayr
- Chair
for Photonics and Optoelectronics, Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München, Königinstrasse 10, 80539 Munich, Germany
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
| | - Carola Lampe
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Nanospectroscopy
Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
| | - Maximilian Löw
- Chair
for Photonics and Optoelectronics, Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München, Königinstrasse 10, 80539 Munich, Germany
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
| | - Janina Roemer
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Soft
Condensed Matter Group, Department of Physics, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Willem Vanderlinden
- Chair
for Applied Physics, Department of Physics and Center for NanoScience
(CeNS), Ludwig-Maximilians-Universität
München, Amalienstrasse
54, 80799 Munich, Germany
| | - Moritz Gramlich
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Nanospectroscopy
Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
| | - Anton X. Böhm
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Soft
Condensed Matter Group, Department of Physics, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Cornelia Sattler
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Soft
Condensed Matter Group, Department of Physics, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Bert Nickel
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Soft
Condensed Matter Group, Department of Physics, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Theobald Lohmüller
- Chair
for Photonics and Optoelectronics, Nano-Institute Munich, Department
of Physics, Ludwig-Maximilians-Universität
München, Königinstrasse 10, 80539 Munich, Germany
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
| | - Alexander S. Urban
- Nanosystems
Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstrasse 4, 80799 Munich, Germany
- Nanospectroscopy
Group, Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstrasse 10, 80539 Munich, Germany
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9
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Bohn BJ, Tong Y, Gramlich M, Lai ML, Döblinger M, Wang K, Hoye RLZ, Müller-Buschbaum P, Stranks SD, Urban AS, Polavarapu L, Feldmann J. Boosting Tunable Blue Luminescence of Halide Perovskite Nanoplatelets through Postsynthetic Surface Trap Repair. Nano Lett 2018; 18:5231-5238. [PMID: 29990435 DOI: 10.1021/acs.nanolett.8b02190] [Citation(s) in RCA: 169] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The easily tunable emission of halide perovskite nanocrystals throughout the visible spectrum makes them an extremely promising material for light-emitting applications. Whereas high quantum yields and long-term colloidal stability have already been achieved for nanocrystals emitting in the red and green spectral range, the blue region currently lags behind with low quantum yields, broad emission profiles, and insufficient colloidal stability. In this work, we present a facile synthetic approach for obtaining two-dimensional CsPbBr3 nanoplatelets with monolayer-precise control over their thickness, resulting in sharp photoluminescence and electroluminescence peaks with a tunable emission wavelength between 432 and 497 nm due to quantum confinement. Subsequent addition of a PbBr2-ligand solution repairs surface defects likely stemming from bromide and lead vacancies in a subensemble of weakly emissive nanoplatelets. The overall photoluminescence quantum yield of the blue-emissive colloidal dispersions is consequently enhanced up to a value of 73 ± 2%. Transient optical spectroscopy measurements focusing on the excitonic resonances further confirm the proposed repair process. Additionally, the high stability of these nanoplatelets in films and to prolonged ultraviolet light exposure is shown.
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Affiliation(s)
- Bernhard J Bohn
- Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany
- Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany
| | - Yu Tong
- Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany
- Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany
| | - Moritz Gramlich
- Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany
- Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany
| | - May Ling Lai
- Cavendish Laboratory , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Markus Döblinger
- Department of Chemistry , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 (E) , 81377 Munich , Germany
| | - Kun Wang
- Lehrstuhl für Funktionelle Materialien, Physik Department , Technische Universität München , James-Franck-Strasse 1 , 85748 Garching , Germany
| | - Robert L Z Hoye
- Cavendish Laboratory , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien, Physik Department , Technische Universität München , James-Franck-Strasse 1 , 85748 Garching , Germany
| | - Samuel D Stranks
- Cavendish Laboratory , JJ Thomson Avenue , Cambridge CB3 0HE , United Kingdom
| | - Alexander S Urban
- Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany
- Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany
| | - Lakshminarayana Polavarapu
- Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany
- Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany
| | - Jochen Feldmann
- Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany
- Nanosystems Initiative Munich (NIM) , Schellingstrasse 4 , 80799 Munich , Germany
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Mueller K, Heck C, Heinzmann D, Schwille J, Klingel K, Kandolf R, Kramer U, Gramlich M, Geisler T, Gawaz M, Schreieck J, Seizer P. P770Comparison of ventricular inducibility with late gadolinium enhancement and myocardial inflammation in endomyocardial biopsy in patients with dilated cardiomyopathy. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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