Temperature-Dependent Photoluminescence of CH3NH3PbBr3 Perovskite Quantum Dots and Bulk Counterparts
| Autor: | Myung Hyun Ann, Jisoo Shin, Chang-Lyoul Lee, Hee Chul Woo, Jin Woo Choi, Sang-Hyun Chin |
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| Rok vydání: | 2018 |
| Předmět: |
Photoluminescence
Materials science Condensed Matter::Other Phonon Scattering Exciton 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics 0104 chemical sciences law.invention Condensed Matter::Materials Science law Quantum dot Condensed Matter::Superconductivity General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Single crystal Light-emitting diode Perovskite (structure) |
| Zdroj: | The Journal of Physical Chemistry Letters. 9:4066-4074 |
| ISSN: | 1948-7185 |
| Popis: | Organic–inorganic lead halide perovskite is emerging as a potential emissive material for light emitting devices, such as, light emitting diodes (LEDs) and lasers, which has emphasized the necessity of understanding its fundamental opto-physical properties. In this work, the temperature-dependent photoluminescence of CH3NH3PbBr3 perovskite quantum dots (QDs), polycrystalline thin film (TF), and single crystal (SC) has been studied. The optophysical properties, such as exciton–phonon scattering, exciton binding energy, and exciton decay dynamics, were investigated. The exciton–phonon scattering of perovskite is investigated, which is responsible for both PL line width broadening and nonradiative decay of excitons. The exciton binding energy of QDs, TF, and SC were estimated to be 388.2, 124.3, and 40.6 meV, respectively. The observed main exciton decay pathway for QDs is the phonon assisted thermal escape, while that for TF and SC was the thermal dissociation due to low exciton binding energy. |
| Databáze: | OpenAIRE |
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