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Tunable Dual-Emission in Monodispersed Sb3+ /Mn2+ Codoped Cs2 NaInCl6 Perovskite Nanocrystals through an Energy Transfer Process.
Small ( IF 13.0 ) Pub Date : 2020-06-30 , DOI: 10.1002/smll.202002547
Xingyi Liu 1 , Xi Xu 1 , Ben Li 1 , Lanlan Yang 1 , Qi Li 1 , Hong Jiang 1 , Dongsheng Xu 1
Affiliation  

Double halide perovskites are a class of promising semiconductors applied in photocatalysis, photovoltaic devices, and emitters to replace lead halide perovskites, owing to their nontoxicity and chemical stability. However, most double perovskites always exhibit low photoluminescence quantum efficiency (PLQE) due to the indirect bandgap structure or parity‐forbidden transition problem, limiting their further applications. Herein, the self‐trapped excitons emission of Cs2NaInCl6 by Sb‐doping, showing a blue emission with high PLQE of 84%, is improved. Further, Sb/Mn codoped Cs2NaInCl6 nanocrystals are successfully synthesized by the hot‐injection method, showing a tunable dual‐emission covering the white‐light spectrum. The studies of PL properties and dynamics reveal that an energy transfer process can occur between the self‐trapped excitons and dopants (Mn2+). The work provides a new perspective to design novel lead‐free double perovskites for realizing a unique white‐light emission.

中文翻译:

通过能量转移过程在单分散的Sb3 + / Mn2 +共掺杂的Cs2 NaInCl6钙钛矿纳米晶体中可调谐双发射。

双卤化物钙钛矿由于其无毒和化学稳定性,是一类有前途的半导体,可用于光催化,光伏器件和发射体,以代替卤化钙钛矿。但是,由于间接的带隙结构或奇偶禁止的跃迁问题,大多数双钙钛矿总是表现出较低的光致发光量子效率(PLQE),从而限制了它们的进一步应用。在本文中,通过Sb掺杂自捕获的Cs 2 NaInCl 6的激子发射得到了改善,显示出具有84%的高PLQE的蓝色发射。此外,Sb / Mn共掺杂的Cs 2 NaInCl 6纳米晶体通过热注入方法成功合成,显示出可调谐的双发射,涵盖了白光光谱。对PL性质和动力学的研究表明,自陷激子和掺杂剂(Mn 2+)之间可能发生能量转移过程。该作品为设计新颖的无铅双钙钛矿提供了新的视角,以实现独特的白光发射。
更新日期:2020-08-06
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