Exciton Character and High‐Performance Stimulated Emission of Hybrid Lead Bromide Perovskite Polycrystalline Film,Advanced Optical Materials

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Exciton Character and High‐Performance Stimulated Emission of Hybrid Lead Bromide Perovskite Polycrystalline Film
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-03-11 , DOI: 10.1002/adom.201902026
Jiangjian Shi ₁ , Yiming Li _{1,

2} , Jionghua Wu _{1,

2} , Huijue Wu ₁ , Yanhong Luo _{1,

2} , Dongmei Li _{1,

2} , Jacek J. Jasieniak ₃ , Qingbo Meng _{1,

4}

Affiliation

Electronic states of hybrid perovskites enable their exceptional optoelectronic applications. Herein, through heterojunction enhanced exciton dissociation and global tracing of multiple radiative electronic states across wide temperature regions, it has been found that excitons while not free carriers dominate the bandedge photoelectric properties of hybrid lead bromide perovskite (MAPbBr₃). MAPbBr₃ has exhibited two types of excitons with giant binding energies and superior phase stability. A bound exciton (BE) has been clearly confirmed according to a saturated photo‐induced bleaching behavior and a correlation of the exciton to the perovskite deep trap state. By stabilizing the excitonic phase of polycrystalline MAPbBr₃, impressively low‐threshold and high‐gain stimulated emission from the BE has been realized at room temperature. Overall, this work provides new insight into the photophysics characteristics of the hybrid perovskite and more importantly brings huge opportunities for exploiting perovskite excitonic mechanism to realize more abundant optoelectronic applications.

中文翻译：

混合溴化钙钛矿多晶薄膜的激子特性和高性能激发发射

混合钙钛矿的电子状态使其具有出色的光电应用。在本文中，通过异质结增强的激子离解和在宽温度范围内的多个辐射电子态的全局跟踪，已经发现，激子而不是自由载流子主导着混合溴化钙钛矿（MAPbBr ₃）的带隙光电性能。MAPbBr ₃表现出两种类型的激子，它们具有巨大的结合能和出色的相稳定性。根据饱和的光致漂白行为以及激子与钙钛矿深阱状态的相关性，已明确确定了束缚激子（BE）。通过稳定多晶MAPbBr ₃的激子相因此，在室温下实现了令人印象深刻的低阈值和高增益的BE激发发射。总体而言，这项工作为杂化钙钛矿的光物理特性提供了新的见解，更重要的是，为利用钙钛矿激子机制实现更丰富的光电应用带来了巨大的机会。

更新日期：2020-03-11

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