Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201800248
Keywords
backlit displays; halide perovskites; ion-exchange; self-assembly; ultrapure green backlight
Categories
Funding
- NSFC [61725402, 51572128, 21403109, 51502139]
- National Key Research and Development Program of China [2016YFB0401701]
- Fundamental Research Funds for the Central Universities [30915012205, 30916015106]
- PAPD of Jiangsu Higher Education Institutions
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Delicate engineering of chromaticity is required to faithfully reproduce colors in a backlit display, this is extremely difficult for green downconverters because the human eye is highly sensitive to green colors. The central challenge is to achieve finely tunable green emissions in the narrow range of 525-535 nm while keeping the full width at half maximum (FWHM) <25 nm at the same time. Here, a room-temperature ion-exchange-mediated self-assembly strategy for preparing FAPbBr(3) (FA = CH(NH2)(2)(+)) nanoplates (NPs) to fulfill this goal is introduced. 2D layered OA(2)PbBr(4) (OA is octadecylamine) NPs are first synthesized by spontaneous reprecipitation, and are then transformed into FAPbBr(3) NPs through a OA(+)-to-FA(+) exchange induced self-assembly of HP monolayers. A c-axis contraction in this process makes a relative large thickness variation in OA(2)PbBr(4) NPs, which can be realized by simply varying the precursor concentration, only result in a small thickness change in subsequent FAPbBr(3) NPs, thereby enabling finely tunable emissions in the range of 525-535 nm along with FWHM <25 nm and a quantum yield up to 85%. As a downconverter, the FAPbBr(3) NPs realize an ultrapure green backlight that covers approximate to 95% Rec. 2020 standard in the CIE 1931 color space.
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