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Temperature-Dependent Photoluminescence of CH3NH3PbBr3 Perovskite Quantum Dots and Bulk Counterparts
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acs.jpclett.8b01593 Hee Chul Woo 1 , Jin Woo Choi 1 , Jisoo Shin 1 , Sang-Hyun Chin 1, 2 , Myung Hyun Ann 1 , Chang-Lyoul Lee 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-07-05 00:00:00 , DOI: 10.1021/acs.jpclett.8b01593 Hee Chul Woo 1 , Jin Woo Choi 1 , Jisoo Shin 1 , Sang-Hyun Chin 1, 2 , Myung Hyun Ann 1 , Chang-Lyoul Lee 1
Affiliation
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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.
中文翻译：
CH 3 NH 3 PbBr 3钙钛矿量子点和本体对应物的温度依赖性光致发光
有机-无机卤化铅钙钛矿正在成为发光器件的潜在发光材料，例如发光二极管（LED）和激光器，它强调了了解其基本光物理特性的必要性。在这项工作中，CH 3 NH 3 PbBr 3的温度依赖性光致发光已经研究了钙钛矿量子点（QDs），多晶薄膜（TF）和单晶（SC）。研究了光物理性质，例如激子-声子散射，激子结合能和激子衰减动力学。研究了钙钛矿的激子-声子散射，这既引起了PL线宽度的加宽，又引起了激子的非辐射衰减。QD，TF和SC的激子结合能分别估计为388.2、124.3和40.6 meV。量子点的主要激子衰变途径是声子辅助的热逸散，而TF和SC的主要激子衰变途径是由于低激子结合能而引起的热解离。
更新日期：2018-07-05
中文翻译：
CH 3 NH 3 PbBr 3钙钛矿量子点和本体对应物的温度依赖性光致发光
有机-无机卤化铅钙钛矿正在成为发光器件的潜在发光材料，例如发光二极管（LED）和激光器，它强调了了解其基本光物理特性的必要性。在这项工作中，CH 3 NH 3 PbBr 3的温度依赖性光致发光已经研究了钙钛矿量子点（QDs），多晶薄膜（TF）和单晶（SC）。研究了光物理性质，例如激子-声子散射，激子结合能和激子衰减动力学。研究了钙钛矿的激子-声子散射，这既引起了PL线宽度的加宽，又引起了激子的非辐射衰减。QD，TF和SC的激子结合能分别估计为388.2、124.3和40.6 meV。量子点的主要激子衰变途径是声子辅助的热逸散，而TF和SC的主要激子衰变途径是由于低激子结合能而引起的热解离。
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