1. NIR II-responsive core–shell La2O2S:Er3+@La2O2S nanoparticles towards 1.5 μm photodetection.
- Author
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Dong, Xinyao, Zhou, Na, Tian, Minfeng, Ji, Yanan, Wang, Jingxuan, Fan, Jianing, Li, Heyang, Xu, Wen, Duan, Ping, and Yin, Xiumei
- Abstract
Rare-earth doped oxysulfides have gained considerable attention as a luminescence host material owing to its good chemical stability and high efficiency. In this study, Er
3+ -sensitized La2 O2 S nanoparticles are prepared by the high-temperature co-precipitation method. La2 O2 S:2%Er3+ is selected to construct La2 O2 S:Er3+ @La2 O2 S core/shell structures through epitaxial growth, and the luminescence properties are studied. The surface defects of La2 O2 S:Er3+ are repaired by the inert protective shell, and the luminescence intensity of the core/shell nanocrystals is increased by 9.6 times. Finally, MAPbI3 is spin-coated over the La2 O2 S:Er3+ @La2 O2 S film to construct narrow band near-infrared photodetectors. Under 1550 nm excitation, the response rate is 23 mA W−1 , detection rate is 2.57 × 108 Jones, and response time is 220 ms. [ABSTRACT FROM AUTHOR]- Published
- 2024
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