1. Ba-doped CsPbBr3 with high quantum efficiency for wide color gamut on white light-emitting diodes.
- Author
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Mei, Enrou, Chen, Yingying, Chen, Ya, He, Qingyun, Tong, Yao, Yu, Ping, Liang, Xiaojuan, and Xiang, Weidong
- Subjects
QUANTUM efficiency ,LIGHT emitting diodes ,MONOCHROMATIC light ,COLOR ,PEROVSKITE - Abstract
The perovskite material has received much attention due to its excellent photoelectric properties. However, the toxicity of Pb has always affected the wide application of perovskite materials. Herein, we proposed to replace Pb ions with the same divalent ions Ba and dope them into the CsPbBr
3 perovskite nanocrystals' (PNCs) lattice to reduce the content of Pb elements. In this work, we have successfully prepared a series of CsPb1−x Bax Br3 PNCs (x = 0, 0.1, 0.2, 0.3, and 0.4) and CsPbBr3 PNCs (Ba-doped concentration = x = 0, 0.05, 0.10, 0.15, and 0.20); the best among them were CsPb0.7 Ba0.3 Br3 PNCs and CsPbBr3 (Ba = 0.1) PNCs, respectively. Compared with CsPbBr3 PNCs, the photoluminescence (PL) intensity of CsPb0.7 Ba0.3 Br3 PNCs and CsPbBr3 (Ba = 0.1) PNCs has been improved to different degrees. It was worth mentioning that after the addition of a Ba element, the photoluminescent quantum yield (PLQY) of CsPb0.7 Ba0.3 Br3 PNCs and CsPbBr3 (Ba = 0.1) PNCs was increased to 81% and 65%, respectively. It was due to the high PLQY of CsPb0.7 Ba0.3 Br3 PNCs that the selected CIE color coordinate monochromatic light encompassed 119.0% of NTSC color gamut. [ABSTRACT FROM AUTHOR]- Published
- 2021
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