Dual center luminescence properties of LiGaAl4O8:Cr3+ near infrared phosphors for LED applications

IF 10 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Today Physics Pub Date : 2024-09-01 DOI:10.1016/j.mtphys.2024.101540

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Abstract

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.

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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。虽然近年来开发出了一些近红外荧光粉，但有关掺杂 Cr3+ 的多位点发光荧光粉的研究较少。在此，我们报告了一种具有双 Cr3+ 发光中心的新型 LiGaAl4O8:xCr3+ （LGAO:Cr3+）荧光粉。在低掺杂浓度下，LGAO:Cr3+ 主要由 Cr1 发射。随着掺杂浓度 x 的增加，由于从 Cr1 到 Cr2 的能量转移概率增加，Cr2 部分的发射强度也随之增加。最后，利用 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 驱动电流下的近红外输出功率为 43.7 mW，在 10 mA 下的光电转换效率为 19.2%，并演示了其在精密设备视觉检测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理进行了深入细致的研究，为近红外 pc-LED 的开发提供了一个很好的范例。

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来源期刊

Materials Today Physics Materials Science-General Materials Science

CiteScore

14.00

自引率

7.80%

发文量

284

审稿时长

15 days

期刊介绍： Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.