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Dual center luminescence properties of LiGaAl4O8:Cr3+ near infrared phosphors for LED applications
Materials Today Physics ( IF 10.0 ) Pub Date : 2024-08-26 , DOI: 10.1016/j.mtphys.2024.101540
Luhui Zhou , Dashuai Sun , Guan Peng , Zeyu Lyu , Zheng Lu , Pengcheng Luo , Congcong Fan , Xiaowei Zhang , Hongpeng You

Near-infrared (NIR) phosphor-converted light emitting diodes (NIR pc-LEDs) hold great promise for applications in night vision imaging, nondestructive analysis, and plant growth. Although some NIR phosphors have been developed in recent years, there are fewer studies on Cr3+-doped multisite luminescent phosphors. Here, we report a novel LiGaAl4O8:xCr3+ (LGAO:Cr3+) phosphors with double Cr3+ luminescence centers. At low doping concentration, LGAO:Cr3+ is dominated by the emission of Cr1. With the increase of doping concentration x, the Cr2 portion of emission intensity increases due to the increased probability of the energy transfer from Cr1 to Cr2. Finally, using the LGAO:0.02Cr3+ NIR phosphor and a commercial 410 nm chip, a NIR pc-LED prototype with a NIR output power of 43.7 mW at 100 mA drive current and a photovoltaic conversion efficiency of 19.2 % at 10 mA was fabricated and its application in visual inspection of precise devices and angiography was demonstrated. This work provides an in-depth and careful study of the luminescent mechanism of the dual-centerd NIR phosphor and serves as a good paradigm for the development of NIR pc-LEDs.

中文翻译:


用于 LED 应用的 LiGaAl4O8:Cr3+ 近红外荧光粉的双中心发光特性



近红外 (NIR) 荧光粉转换发光二极管 (NIR pc-LED) 在夜视成像、无损分析和植物生长方面的应用前景广阔。尽管近年来已经开发出一些近红外荧光粉,但对Cr3+掺杂多位点发光荧光粉的研究较少。在这里,我们报道了一种具有双 Cr3+ 发光中心的新型 LiGaAl4O8:xCr3+ (LGAO:Cr3+) 荧光粉。在低掺杂浓度下,LGAO:Cr3+的发射主要是Cr1。随着掺杂浓度x的增加,由于能量从Cr1到Cr2转移的概率增加,Cr2部分的发射强度增加。最后,使用 LGAO:0.02Cr3+ 近红外荧光粉和商用​​ 410 nm 芯片,制作了近红外 pc-LED 原型,在 100 mA 驱动电流下近红外输出功率为 43.7 mW,在 10 mA 下光电转换效率为 19.2%。展示了其在精密设备视觉检查和血管造影中的应用。这项工作对双中心近红外荧光粉的发光机制进行了深入细致的研究,为近红外pc-LED的发展提供了良好的范例。
更新日期:2024-08-26
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