Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202103275
Keywords
perovskites; superior stability; tunable photoluminescence; water additive; WLEDs
Categories
Funding
- K. C. Wong Education Foundation [GJTD-2018-09]
- Key Research Program of Frontier Sciences, CAS [YZDY-SSW-JSC018]
- International Partnership Program of Chinese Academy of Sciences [121522KYSB20190022]
- RAMP
- D projects in key areas of Guangdong Province [2020B0101010001]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [Y201947]
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This study has successfully fabricated CsPbBr3/CsPb2Br5@PbBr(OH) nano/microspheres with superior stability and outstanding photoluminescence quantum yield using a water-assisted process. The nano/microspheres showed excellent stability and photoluminescence properties even when immersed in water for an extended period. Furthermore, white light-emitting diodes with high luminous efficacy were successfully developed using these nano/microspheres.
The disappointing stability of perovskites, especially in water, remains a key issue hindering their further commercialization. Here, CsPbBr3/CsPb2Br5@PbBr(OH) (PQDs@PbBr(OH)) nano/microspheres with superior stability and outstanding photoluminescence quantum yield (PLQY, approximate to 98%) are fabricated through a water-assisted process. The nano/microspheres can maintain excellent photoluminescence (PL) intensity and high PLQY (approximate to 90%) when immersed in water for more than 18 months. By changing the water content in the reaction mixture, the phase, particle size, and PL peaks of the nano/microspheres will change. Compared with CsPbBr3/Cs4PbBr6 nanocrystals synthesized without water, PQDs@PbBr(OH) nano/microspheres exhibit better thermal stability, photostability, and superior stability in water. Based on the first-principles calculations, the enhanced stability results from PbBr(OH) with high decomposition enthalpy in water, which can effectively prevent water from contacting PQDs embedded in it. Moreover, white light-emitting diodes are fabricated by mixing green-emitting PQDs@PbBr(OH) powder and K2SiF6:Mn4+ (KSF) red phosphor on a 460 nm blue chip and the device shows a high luminous efficacy of 101.27 lm W-1 at 10 mA. This work not only provides a reliable method for the facile preparation of ultrastable perovskites, but also has great potentials for future practical applications.
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