透射式测量系统测定远程荧光粉板的温度相关光学特性

摘要：我们提出了一种透射式测量系统，用于测定大功率白光发光二极管中荧光粉或远程荧光粉板的温度相关光学特性 (TDOC)，与它们的稳定性和可靠性有关。所提出的测量系统具有远程激发特性，能够分别控制测试荧光粉或远程荧光粉 板的温度和激发光源（（ 发射波长为 360-470 nm）的温度，以避免它们之间的热干扰。最后通过制造两种类型的远程荧光 粉板（（ 即黄色 Y3Al5O12:Ce3+ 和红色 CaAlSiN3:Eu2+ 远程荧光粉板）来检验该系统。还对所提出的透射式系统和反射 式系统在不同温度下进行了比较。结果表明，传统反射式系统可能高估了不同温度下远程荧光粉板的荧光量子效率和荧 光转换效率。采用所提出的方法并进行实验，我们发现硅-荧光粉混合物中硅的比例对远程荧光粉板的 TDOC 有显著影 响。最后，通过所提出的系统和微高光谱成像技术，还研究了微观层面的热猝灭效应。 期刊 IEEE Transactions on Electron Devices

DOI：10.1109/TED.2018.2890193

设备：GaiaMicro

Determining Temperature-Dependent Optical Characteristics of Remote Phosphor Plates by Transmission-Type Measurement System

Abstract：We propose a transmission-type measurement system for determining temperature-dependent optical characteristics (TDOCs) for phosphors or remote phosphor plateswhich are applied in high-powerwhite light-emitting diodes, related to their stabilities and reliabilities. The proposed measurement system possesses remote-excitation characteristics and is able to separately control the temperature of tested phosphors or remote phosphor plates and that of excitation light sources (with the emission wavelength of 360–470 nm), to avoid the heat interference between them. This system is finally examined by fabricating two types of remote phosphor plates, i.e., yellow Y3Al5O12:Ce3+ and red CaAlSiN3:Eu2+ remote phosphor plates. A comparison between the proposed transmission-type system and the reflection-type system at various temperatures is also carried out. Results show that both the phosphor quantum efficiency and phosphor conversion efficiency of remote phosphor plates under various temperatures are possibly overestimated by the traditional reflection-type system. Employing the proposed method and carrying out experiments, we discover that the fraction of silicone in the silicone–phosphor mixture affects TDOCs of remote phosphor plates remarkably. Finally, via both the proposed system and the microhyperspectral imaging technology, thermal-quenching effects in the microcosmic level have also been investigated.