Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 28, Pages 31770-31775Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06745
Keywords
perovskite; nanostructure; stability; polymer; light-emitting device
Funding
- National Creative Research Initiative (CRI) Center for Multi-Dimensional Directed Nanoscale Assembly [2015R1A3A2033061]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2019R1I1A2A01063804]
- National Research Foundation of Korea [10Z20130012893, 2019R1I1A2A01063804] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Perovskite nanocrystals are promising luminescent materials with synthetic feasibility and band gap tunability. Nonetheless, application of the perovskite nanocrystals to light-emitting devices has been challenging because of the intrinsic poor colloidal stability and environmental vulnerability issues. Here, we introduce a new protocol for highly air-stable perovskite nanocrystal layers with a tunable band gap via a simple nanocrystal pinning process. The nanocrystals were composed of CH3NH3PbBr3 (MAPbBr(3)) mixed with (vinylbenzylamine)(2)PbBr4((VBzA)(2)PbBr4), which contains a photopolymerizable structure-directing ligand. Along with the compostion of (VBzA)(2)PbBr4, the band gap of the perovskite layer continuously increased with the reduction of the nanocrystal size and also lattice distortion. The nanocrystal film readily polymerized upon exposure to visible light was highly stable under humid air more than 15 days. Its application to bluish-green light-emitting diodes is demonstrated.
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