Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 9, Issue 14, Pages 4980-4987Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c07911
Keywords
Metal halide nanocrystals; Lead-free; Energy transfer; Ultraviolet photodetectors
Categories
Funding
- Key Program of NSFC-Guangdong Joint Funds of China [U1801253]
- National Natural Science Foundation of China [11874181, 11674126, 11674127, 11904124]
- Special Project of the Province-University Co-constructing Program of Jilin Province [SXGJXX2017-3]
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The lead-free Ce3+ doped Cs3MnBr5 metal halide nanocrystals exhibit a broadband UV response and efficient blue photoluminescence, with significantly improved photoluminescence quantum yield and longtime stability. These nanocrystals were used to fabricate a highly desirable broadband UV photodetector with a responsivity of 1.1 A/W and millisecond response time, demonstrating a strategy for novel UV optoelectronic systems.
Lead halide perovskites are widely used for optoelectronic devices because they possess a high charge carrier mobility, high photoconversion efficiency, low energy cost, etc. However, lead toxicity and instability of these perovskites prevent their wide-scale industrial applications. Herein, we successfully fabricated the lead-free Ce3+ doped Cs3MnBr5 metal halide nanocrystals (MHNCs), which displays a broad UV response and an efficient blue photoluminescence at 398 and 423 nm. The introduction of Ce3+ ions results in a broadband response to UV light, a highly improved photoluminescence quantum yield from 38% to 90%, and an improved longtime stability. The highly desirable broadband UV photodetector was fabricated based on the Ce3+ doped Cs3MnBr5 MHNCs film, which shows a broadband response to UV light ranging from 200 to 380 nm. The responsivity was 1.1 A/W with a millisecond rise/fall time response. This study demonstrates a strategy of fabricating the broadband UV photodetector for novel and advanced UV optoelectronic systems.
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