Tailoring thermal behavior and luminous performance in LuAG:Ce films via thickness control for high-power laser lighting applications

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-10-26 DOI:10.1007/s12598-024-03023-x

Shao-Hong Liu, Bing-Guo Xue, Li-Min Zhou, Hao Cui, Man-Men Liu, Li Chen, Ming Wen, Hai-Gang Dong, Feng Liu, Wei Wang, Song Li

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Abstract

Lutetium aluminum garnet doped with cerium (LuAG:Ce) thin films have been identified as a promising material for high-power laser-driven lighting applications. In this study, spray pyrolysis we employed to fabricate LuAG:Ce films on sapphire substrates and the impact of film thickness on thermal management and light emission efficiency was investigated. Our results show that, regardless of thickness, LuAG:Ce films exhibit impressive internal quantum efficiencies (IQE) exceeding 83.2% and external quantum efficiencies (EQE) surpassing 56.4%, with minimal alteration of luminescent color. Notably, thinner films facilitate more efficient heat dissipation to the underlying sapphire substrate, resulting in superior thermal management and outstanding luminous performance under high-power laser excitation. Specifically, the thinnest LuAG:Ce film (15.79 μm) exhibited rapid thermal stabilization (~ 130 °C within 30 s) and maintained stability during continuous irradiation lasting 30 min, with a corresponding decrease in luminous flux to 87.9% of its initial value within the first 60 s. This film also demonstrated relatively high and stable conversion efficiency and luminous efficiency, achieving higher saturation thresholds (15 W·mm⁻²) and luminous flux (1070 lm). In contrast, thicker films exhibited a shift in the saturation point toward lower power densities. These findings provide valuable insights for the practical implementation of LuAG:Ce films in advanced lighting technologies.

Graphic abstract

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通过厚度控制调整 LuAG:Ce 薄膜的热性能和发光性能，实现高功率激光照明应用

掺杂铈的镥铝石榴石（LuAG:Ce）薄膜已被确定为一种有望用于高功率激光驱动照明应用的材料。在这项研究中，我们采用喷雾热解技术在蓝宝石基底上制造了 LuAG:Ce 薄膜，并研究了薄膜厚度对热管理和光发射效率的影响。研究结果表明，无论薄膜厚度如何，LuAG:Ce 薄膜的内部量子效率（IQE）均超过 83.2%，外部量子效率（EQE）超过 56.4%，且发光颜色的变化极小。值得注意的是，更薄的薄膜有利于更有效地向底层蓝宝石衬底散热，从而实现卓越的热管理和高功率激光激发下的出色发光性能。具体来说，最薄的 LuAG:Ce 薄膜（15.79 μm）表现出快速的热稳定（30 秒内约 130 °C），并在持续照射 30 分钟后保持稳定，光通量在最初 60 秒内相应降至初始值的 87.9%。相比之下，较厚的薄膜显示出饱和点向较低功率密度的转移。这些发现为在先进照明技术中实际应用 LuAG:Ce 薄膜提供了宝贵的见解。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.