Charge Carrier Localization in Doped Perovskite Nanocrystals Enhances Radiative Recombination,Journal of the American Chemical Society

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Charge Carrier Localization in Doped Perovskite Nanocrystals Enhances Radiative Recombination
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-05-16 , DOI: 10.1021/jacs.1c01567
Sascha Feldmann ₁ , Mahesh K Gangishetty _{2,

3} , Ivona Bravić ₁ , Timo Neumann _{1,

4} , Bo Peng ₁ , Thomas Winkler ₁ , Richard H Friend ₁ , Bartomeu Monserrat _{1,

5} , Daniel N Congreve ₂ , Felix Deschler _{1,

4}

Affiliation

Nanocrystals based on halide perovskites offer a promising material platform for highly efficient lighting. Using transient optical spectroscopy, we study excitation recombination dynamics in manganese-doped CsPb(Cl,Br)₃ perovskite nanocrystals. We find an increase in the intrinsic excitonic radiative recombination rate upon doping, which is typically a challenging material property to tailor. Supported by ab initio calculations, we can attribute the enhanced emission rates to increased charge carrier localization through lattice periodicity breaking from Mn dopants, which increases the overlap of electron and hole wave functions locally and thus the oscillator strength of excitons in their vicinity. Our report of a fundamental strategy for improving luminescence efficiencies in perovskite nanocrystals will be valuable for maximizing efficiencies in light-emitting applications.

中文翻译：

掺杂钙钛矿纳米晶体中的电荷载流子局域化增强了辐射复合

基于卤化物钙钛矿的纳米晶体为高效照明提供了一个有前景的材料平台。利用瞬态光谱，我们研究了锰掺杂 CsPb(Cl,Br) ₃钙钛矿纳米晶体中的激发复合动力学。我们发现掺杂后本征激子辐射复合率有所增加，这通常是一种具有挑战性的材料特性。在从头计算的支持下，我们可以将发射速率的增强归因于通过锰掺杂剂的晶格周期性断裂增加了电荷载流子局域化，这增加了电子和空穴波函数局部的重叠，从而增加了其附近激子的振荡强度。我们关于提高钙钛矿纳米晶体发光效率的基本策略的报告对于最大限度地提高发光应用的效率非常有价值。

更新日期：2021-06-17

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