Abstract
The intrinsic water and thermal instabilities of perovskite nanocrystals (PNCs) are considered to be a major obstacle hindering their wide potential applications in optoelectronic devices. Herein, we report the enhanced stability of MAPbBr3 (MA=methylammonium) PNCs by ligand modification of 3,3-diphenylpropylamine (DPPA) and octylamine bromide (OABr). The resultant MAPbBr3@PVDF (polyvinylidene fluoride) films could maintain 77.8% and 81.2% of original photoluminescence quantum yield (PL QY, 85.9%) once keeping at 60 ℃ and immersing in water for 7 days, respectively. The enhanced thermal stability could be mainly attributed to two situations. One is the introduced DPPA ligand, which can passivate the surface defects with large steric resistance to suppress the further growth of PNCs during heating. The other is the added OABr, which can not only coordinate to both surface cations and anions of PNCs, but also make the effective compensation of Br– vacancies stabilize the target MAPbBr3 PNCs.
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