荧光粉
光致发光
发光
材料科学
近红外光谱
持续发光
发光二极管
二极管
烧结
分析化学(期刊)
光电子学
化学
光学
物理
冶金
热释光
色谱法
作者
Yi Wei,Zhiyu Gao,Xiaohan Yun,Hang Yang,Yixin Liu,Guogang Li
标识
DOI:10.1021/acs.chemmater.0c02814
摘要
Near-infrared light-emitting diodes (NIR-LEDs) are potential candidates in food composition analysis, temperature and security monitoring, biometrics, and medical applications. To realize the above objectives, the development of NIR-emitting phosphors is urgently required. Herein, a novel NIR emission is successfully achieved in Bi3+-activated XAl12O19 (X = Ba, Sr, Ca) compounds by constructing the selective site occupation of Bi3+ in Al3+ polyhedra with small coordination number. The designed phosphors exhibit broad-band NIR emission of Bi3+ from 600 to 1000 nm. Interestingly, a broad photoluminescence control from blue to red is also achieved by just changing the sintering atmosphere. The blue emission of Bi3+ should be assigned to the prior occupation in X2+ sites and the existence of oxygen vacancy. This work not only provides a novel insight to develop NIR-emitting Bi3+-activated phosphors but also helps to reveal the underlying NIR luminescence mechanism of Bi3+ in inorganic compounds.
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