Near-Infrared Emission from Tin-Lead (Sn-Pb) Alloyed Perovskite Quantum Dots by Sodium Doping.
Feng LiuJunke JiangYaohong ZhangChao DingTaro ToyodaShuzi HayaseRuixiang WangShuxia TaoQing ShenPublished in: Angewandte Chemie (International ed. in English) (2020)
Phase-stable CsSnx Pb1-x I3 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.
Keyphrases
- quantum dots
- energy transfer
- high resolution
- sensitive detection
- heavy metals
- transition metal
- room temperature
- high efficiency
- solar cells
- signaling pathway
- aqueous solution
- single molecule
- molecular dynamics
- big data
- solid state
- risk assessment
- machine learning
- human health
- computed tomography
- deep learning
- case control
- climate change
- electron microscopy