Lead-Free Sodium-Indium Double Perovskite Nanocrystals through Doping Silver Cations for Bright Yellow Emission

被引：252

作者：

Han, Peigeng ^{[1
,2
,3
]}

Mao, Xin ^{[1
,3
]}

Yang, Songqiu ^{[1
]}

Zhang, Fei ^{[1
,3
]}

Yang, Bin ^{[1
]}

Wei, Donghui ^{[4
]}

Deng, Weiqiao ^{[1
,2
]}

Han, Keli ^{[1
,2
]}

机构：

[1] State Key Lab Mol React Dynam Dalian Inst Chem Ph, Chinese Acad Sci, Dalian 116023, Peoples R China

[2] Shandong Univ, Inst Mol Sci & Engn, Qingdao 266237, Peoples R China

[3] Univ, Chinese Acad Sci, Beijing 100039, Peoples R China

[4] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2019年 / 58卷 / 48期

关键词：

double perovskites; nanocrystals; photoluminescence; silver ion doping; self-trapped excitons (STEs); WHITE-LIGHT EMISSION; HALIDE PEROVSKITES; COLLOIDAL NANOCRYSTALS; ANION-EXCHANGE; RB; BI; BR;

D O I：

10.1002/anie.201909525

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Lead-free halide perovskite nanocrystals (NCs) have drawn wide attention for solving the problem of lead perovskites toxicity and instability. Herein, we synthesize the direct band gap double perovskites undoped and Ag-doped Cs2NaInCl6 NCs by variable temperature hot injection. The Cs2NaInCl6 NCs have little photoluminescence because of dark self-trapped excitons (STEs). The dark STEs can be converted into bright STEs by doping with Ag+ to produce a bright yellow emission, with the highest photoluminescence quantum efficiency of 31.1%. The dark STEs has been directly detected experimentally by ultrafast transient absorption (TA) techniques. The dynamics mechanism is further studied. In addition, the Ag-doped NCs show better stability than the undoped ones. This result provides a new way to enhance the optical properties of lead-free perovskites NCs for high-performance light emitters.

引用

页码：17231 / 17235

页数：5

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