Journal
OPTIK
Volume 267, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2022.169705
Keywords
Optical materials; Luminescence; Phase transformation
Categories
Funding
- Natural Science Foundation of Shaanxi Province [2020JM417]
- Youth Innovation Team Foundation of Education Department of Shaanxi Province
- Youth Innovation Team of Shaanxi Universities
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Emissive Cs4PbBr6/CsPbBr3 perovskite composites with green emission have been synthesized by a simple method, and the green emission is attributed to both the composite and energy transfer. The composites show excellent stability after 60 days of storage in ambient environment.
Herein, CsPbBr(3 )and Cs4PbBr6/CsPbBr3 perovskite composites have been synthesized by a simple supersaturated recrystallization procedure. X-ray diffraction and absorption spectra confirm the evolution from CsPbBr3 to Cs4PbBr6 by adding oleic acid and oleylamine simultaneously, which leads to the formation of green emissive Cs4PbBr6/CsPbBr3 perovskite composites. Gaussian fitting of the emission spectra and luminescent lifetime investigation indicate that the green emission is attributed to both Cs4PbBr6 and CsPbBr3, which originates from the exciton radiative recombination mediated by the trap states and the electron-hole recombination, respectively. Moreover, the emissive Cs4PbBr(6) can further promote the emission of CsPbBr3 by energy transfer process in Cs4PbBr6/CsPbBr3 composites. The photoluminescence intensity declines by less than 10 % after 60 days of storage in ambient environment, reflecting the excellent stability of the composites for lighting and displaying application.
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