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Lead‐Free Sodium–Indium Double Perovskite Nanocrystals through Doping Silver Cations for Bright Yellow Emission
Author(s) -
Han Peigeng,
Mao Xin,
Yang Songqiu,
Zhang Fei,
Yang Bin,
Wei Donghui,
Deng Weiqiao,
Han Keli
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201909525
Subject(s) - photoluminescence , perovskite (structure) , doping , halide , exciton , indium , nanocrystal , materials science , absorption (acoustics) , chemistry , nanotechnology , chemical physics , optoelectronics , photochemistry , inorganic chemistry , crystallography , condensed matter physics , physics , composite material
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 Cs 2 NaInCl 6 NCs by variable temperature hot injection. The Cs 2 NaInCl 6 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.