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Near‐Infrared Emission from Tin–Lead (Sn–Pb) Alloyed Perovskite Quantum Dots by Sodium Doping
Author(s) -
Liu Feng,
Jiang Junke,
Zhang Yaohong,
Ding Chao,
Toyoda Taro,
Hayase Shuzi,
Wang Ruixiang,
Tao Shuxia,
Shen Qing
Publication year - 2020
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.201916020
Subject(s) - photoluminescence , doping , x ray photoelectron spectroscopy , quantum dot , materials science , perovskite (structure) , tin , quenching (fluorescence) , ion , analytical chemistry (journal) , nanotechnology , optoelectronics , chemistry , chemical engineering , crystallography , fluorescence , physics , metallurgy , optics , organic chemistry , chromatography , engineering
Phase‐stable CsSn x Pb 1− x I 3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near‐infrared region. Unfortunately, optimal utilization of their potential is limited by the severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of approximately 0.3 %. The ultra‐low sodium (Na) doping presented herein is found to be effective in improving PL QYs of these alloyed QDs without alerting their favourable electronic structure. X‐ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I − and Sn 2+ ions upon Na doping, which potentially helps to stabilize Sn 2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na‐doped QDs reaches up to around 28 %, almost two orders of magnitude enhancement compared with the pristine one.