| Autor: |
Li, Tianfeng, He, Xingyi, Liang, Zifan, Dong, Yingxin, Liu, Renming, Chi, Zhen, Kuang, Yanmin, Wang, Xiaojuan, Guo, Lijun |
| Předmět: |
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| Zdroj: |
CrystEngComm; 7/21/2024, Vol. 26 Issue 27, p3726-3735, 10p |
| Abstrakt: |
The emission of cyan light (470–500 nm), an essential component of the visible light spectrum, plays a crucial role in lighting, display, and light communication. CsPbBr3 quantum dots (QDs) have shown excellent performance in the green spectral regions, with high color purity, efficiency, and brightness. In order to shift the emission wavelength to the cyan, mixed-halide compositions and quantum-confinement engineering have been employed. Unfortunately, mixed-halide perovskites exhibit undesirable phase separation during optical and electrical excitations, leading to spectral instability. Quantum confinement in pure-halide QDs requires synthetic protocols that involve high loading of long-chain insulating ligands. In this study, we report color-stable cyan CsPbBr3 quantum dots (C-PQDs) by surface passivation via incorporating Zn2+ cations. The incorporation of ZnBr2 into the precursor solution facilitates Zn2+ and Br− substitution into the QDs surface/subsurface layers to induce passivation of existing Pb2+ and Br− vacancies and increase the photoluminescence quantum yield from 53.6% to 96.4% at 480 nm. Moreover, after storage under ambient conditions for 30 days or exposure to ultraviolet light for 60 minutes or heating at 333 K, the PL intensity of ZnBr2-treated C-PQDs only shows a minimal decrease. Furthermore, white and cyan light-emitting diodes (LEDs) are successfully constructed, suggesting that the proposed ZnBr2-treated strategy can promote the development of perovskite materials for a wider range of optoelectronic applications. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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