荧光粉
半最大全宽
材料科学
光电子学
近红外光谱
宽带
发光二极管
量子效率
发光
二极管
发光效率
光学
纳米技术
物理
图层(电子)
作者
Hao Suo,Yu Wang,Xiaoqi Zhao,Xin Zhang,Leipeng Li,Kuiwen Guan,Wenge Ding,Panlai Li,Zhijun Wang,Feng Wang
标识
DOI:10.1002/lpor.202200012
摘要
Abstract The rapid development of near‐infrared (NIR) spectroscopic techniques has greatly stimulated the discovery of novel broadband NIR‐emitting phosphors as advanced light sources. Herein, a novel double‐perovskite phosphor La 2 MgHfO 6 :Cr 3+ /Yb 3+ that displays ultra‐broadband NIR emissions with a full‐width at half maximum (FWHM) of 333 nm is reported. The remarkable luminescence property stems from the multiple crystallographic sites, relatively weak crystal field, and efficient Cr 3 ‐to‐Yb 3+ energy transfer (ET). The site occupation of Cr 3+ is elaborately verified by the Rietveld refinement and first‐principles calculation. By controlling the ET process, the internal/external quantum efficiency (IQE/EQE), bandwidth, and thermal stability of NIR emissions are substantially improved. The as‐prepared phosphors are further integrated into a miniaturized NIR light‐emitting diode (LED) package, demonstrating superior performance in rapid nondestructive detection of structural failure in thin electronic cables. The results described here provide a novel pointcut for designing broadband NIR‐emitting phosphors with desired optical properties toward applications in industrial inspection and medical diagnosis.
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