TY  - JOUR
AU  - Zhang, Mingming
AU  - Zhao, Lili
AU  - Xie, Jiahao
AU  - Zhang, Qian
AU  - Wang, Xiaoyu
AU  - Yaqoob, Najma
AU  - Yin, Zhengmao
AU  - Kaghazchi, Payam
AU  - Zhang, San
AU  - Li, Hua
AU  - Zhang, Chunfeng
AU  - Wang, Lei
AU  - Zhang, Lijun
AU  - Xu, Weigao
AU  - Xing, Jun
TI  - Molecular engineering towards efficientwhite-light-emitting perovskite
JO  - Nature Communications
VL  - 12
IS  - 1
SN  - 2041-1723
CY  - [London]
PB  - Nature Publishing Group UK
M1  - FZJ-2021-05586
SP  - 4890
PY  - 2021
AB  - Low-dimensional hybrid perovskites have demonstrated excellent performance as white-light emitters. The broadband white emission originates from self-trapped excitons (STEs). Since the mechanism of STEs formation in perovskites is still not clear, preparing new low-dimensional white perovskites relies mostly on screening lots of intercalated organic molecules rather than rational design. Here, we report an atom-substituting strategy to trigger STEs formation in layered perovskites. Halogen-substituted phenyl molecules are applied to synthesize perovskite crystals. The halogen-substituents will withdraw electrons from the branched chain (-R-NH3+) of the phenyl molecule. This will result in positive charge accumulation on -R-NH3+, and thus stronger Coulomb force of bond (-R-NH3+)-(PbBr42−), which facilitates excitons self-trapping. Our designed white perovskites exhibit photoluminescence quantum yield of 32%, color-rendering index of near 90 and chromaticity coordinates close to standard white-light. Our joint experiment-theory study provides insights into the STEs formation in perovskites and will benefit tailoring white perovskites with boosting performance.
LB  - PUB:(DE-HGF)16
C6  - 34385451
UR  - <Go to ISI:>//WOS:000686181800028
DO  - DOI:10.1038/s41467-021-25132-2
UR  - https://juser.fz-juelich.de/record/904016
ER  -