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Self-Assembly of Perovskite CsPbBr3 Quantum Dots Driven by a Photo-Induced Alkynyl Homocoupling Reaction
Hongbo Li1, Xiangdong Liu1, Qifei Ying1
1Institute of Advanced Materials (IAM), Nanjing Tech University, 30 South Puzhu Road, Nanjing, Jiangsu, 211816, China.
Abstract:
Herein, we report the facile growth of three-dimensional CsPbBr3 perovskite supercrystals (PSCs) self-assembled from individual CsPbBr3 perovskite quantum dots (PQDs). By varying the carbon chain length of a surface-bound ligand molecule, 1-alkynyl acid, different morphologies of PSCs were obtained accompanied by an over 1000-fold photoluminescence improvement compared with that of PQDs. Systematic analyses have shown, for the first time, that under UV irradiation, CsBr, the byproduct formed during PQDs synthesis, could effectively catalyze the homocoupling reaction between two alkynyl groups, which further worked as a driving force to push forward the self-assembly of PQDs.
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