Near-Infrared emission from tin–Lead (Sn–Pb) alloyed perovskite quantum dots by sodium doping

Feng Liu, Junke Jiang, Yaohong Zhang, Chao Ding, Taro Toyoda, Shuzi Hayase, Ruixiang Wang, Shuxia Tao (Corresponding author), Qing Shen (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Phase-stable CsSnxPb1−xI3 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 Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ 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.

Original languageEnglish
Pages (from-to)8421-8424
Number of pages4
JournalAngewandte Chemie - International Edition
Volume59
Issue number22
Early online date20 Mar 2020
DOIs
Publication statusPublished - 25 May 2020

Keywords

  • doping
  • nanoparticles
  • near-infrared emission
  • perovskite quantum dots
  • tin–lead perovskites

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