期刊
APPLIED MATERIALS TODAY
卷 26, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apmt.2021.101288
关键词
White-light emission; Self-trapped excitons; Double perovskite nanocrystals; Colloidal stability; Dual cationic ligand
资金
- Operational Programme Research, Development and Education - European Regional Development Fund of the Ministry of Education, Youth and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/15_003/0000416]
- Czech Science Foundation, project GA CR - EXPRO [19-27454X]
- Palacky University
- [IGA_PrF_2021_031]
Bismuth-doped alloyed Cs2Ag1-xNaxInCl6 double perovskite nanocrystals with high photoluminescence quantum yield and long-term stability were successfully synthesized and purified. The optimized bismuth-doping produced warm white-light emission with a photoluminescence quantum yield of 40%. The synthesis of highly emissive and stable DP NCs was achieved by utilizing a combination of silver-trioctylphosphine complex and TOP ligand.
Bismuth-doped alloyed Cs2Ag1-xNaxInCl6 double perovskite nanocrystals (DP NCs) emerged as a new class of lead-free alternative for single-emitter-based solution-processed white-light-emitting devices (WLEDs). However, their thin-film processing and device fabrication have been limited due to low photoluminescence (PL) quantum yield (QY) and degradation during purification from the as-synthesized crude solution. Moreover, easy reduction of a silver ions by oleylamine also raised concern regarding stability issues of silver based DP NCs. Here, we report a facile synthesis and purification method for shape-pure and monodispersed bismuth-doped alloyed Cs2Ag1-xNaxInCl6 DP NCs with high PL QY and long-term stability. At optimized bismuth-doping, alloyed Cs2Ag1-xNaxInCl6 DP NCs showed warm white-light-emission with a PL QY of 40% due to suppressed non-radiative recombination. The synthesis of highly emissive and stable DP NCs was achieved by utilizing a combination of strongly coordinating silver-trioctylphosphine (Ag-TOP) complex along with additional TOP ligand. The Ag-TOP complex served as a highly reactive silver precursor and prevented the reduction of silver ions into metallic silver. While TOP facilitated the nucleophilic reaction with benzoyl chloride during nucleation and growth stage and forms benzoyl trioctylphosphonium chloride intermediate that served as both halide source and surface capping ligand which enabled the formation of high-quality DP NCs. The high tolerance of DP NCs against common antisolvents such as methyl acetate and isopropanol was attributed to the tight binding of dual cationic ligand benzoyl trioctylphosphonium and oleylammonium cations together with oleate anion to the surface of DP NCs. (C) 2021 Published by Elsevier Ltd.
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