The AlN–Ce:YAG composite ceramic is an effective phosphor for high-power laser illumination. The thermal properties of an AlN–Ce:YAG composite phosphor were studied to suppress thermal quenching. This composite ceramic has a high heat dissipation effect owing to the dispersion of AlN particles, which exhibit high thermal conductivity. Exciting the phosphor with a high-power-density laser beam concentrates heat in a narrow area. The heat is efficiently dissipated by the AlN particles, thereby reducing the phosphor temperature. A new technique was developed to estimate the thermal conductivity from the emission spectrum and the spot center temperature of the composite ceramic. The heat value was calculated by subtracting the power of the emission spectrum from the incident laser power. The spot center temperature was measured using a thermographic camera. The thermal conductivity was simulated by inputting the heat value and spot center temperature into the model of the phosphor sample. It was clarified that the thermal conductivity improved, as the AlN particle content increased. This result is consistent with the measurements obtained using the laser flash method. This technique is useful for designing lighting systems, as it enables the estimation of thermal conductivity when light is emitted from a condensing spot.

AlN-Ce:YAG 复合陶瓷是用于高功率激光照明的有效荧光粉。研究了 AlN-Ce:YAG 复合荧光粉的热性能以抑制热猝灭。这种复合陶瓷由于AlN颗粒的分散而具有高散热效果，AlN颗粒表现出高导热性。用高功率密度的激光束激发荧光粉将热量集中在一个狭窄的区域。热量通过 AlN 颗粒有效地消散，从而降低了荧光粉温度。开发了一种新技术来估计复合陶瓷的发射光谱和点中心温度的热导率。通过从入射激光功率中减去发射光谱的功率来计算热值。使用热像仪测量点中心温度。通过将热值和点中心温度输入到荧光粉样品的模型中来模拟热导率。明确了热导率随着AlN颗粒含量的增加而提高。该结果与使用激光闪光法获得的测量结果一致。这种技术对于设计照明系统很有用，因为它可以在光从聚光点发射时估计热导率。该结果与使用激光闪光法获得的测量结果一致。这种技术对于设计照明系统很有用，因为它可以在光从聚光点发射时估计热导率。该结果与使用激光闪光法获得的测量结果一致。这种技术对于设计照明系统很有用，因为它可以在光从聚光点发射时估计热导率。