Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 45, Pages 26116-26122Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta08421e
Keywords
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Funding
- National Natural Science Foundation of China [61505161, 11574248]
- National Key R&D Program of China [2016YFB0400702]
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Lead halide perovskite nanocrystals (NCs) have recently attracted intense interest as promising luminophores for optoelectronic devices. However, their extensive applications are still hampered by a high-cost synthesis method and the poor stability and low photoluminescence quantum yield (PLQY) of NCs. To address these issues, herein, a fast, room-temperature method is adopted to prepare CsPbBr3 NCs with the use of green synthetic solvents. More importantly, we explore an efficient postsynthetic dual-surface-passivation strategy of CsPbBr3 NCs with 1,3-adamantanedicarboxylic acid (ADA) and ZnBr2 ligands, which exhibits near-unity PLQY and ultra-high stability. The theoretical results show that such a remarkable performance stems from efficient passivation of the massive surface defects of CsPbBr3 with ADA and ZnBr2, suppressing the formation of surface nonradiative recombination centers. Besides, we fabricated white light-emitting diodes (WLEDs) based on essentially trap-free CsPbBr3 NCs. The optimal device exhibits a luminous efficiency of up to 68.7 lm W-1 and wide color gamut of 119% of the NTSC standard.
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