Hot Isostatic Pressing Post-treatment and Performance of Red-emitting AlN-CaAlSiN3∶Eu Composite Phosphor Ceramics

Abstract: The previously reported highly thermal conductive red-emitting AlN-CaAlSiN3∶Eu composite phosphor ceramic is difficult to improve the luminescence performance due to the carbon contamination problem caused by spark plasma sintering(SPS). In this paper, hot isostatic pressing(HIP) post-treatment is used to prepare red-emitting phosphor ceramics with excellent luminescence performance and extremely high saturation threshold, which promotes the development of high-power laser lighting. The SPS sintered samples were treated by HIP in N2 atmosphere. The experimental results show that the luminescence intensity and quantum efficiency of the samples are doubled after HIP post-treatment, the luminous flux is increased by 51%, and the saturation threshold is increased by more than 15%. The sample with the best performance remains intact without luminance saturation when the incident laser power is as high as 15 W, and the luminous flux is up to 197 lm.

Keywords: laser lighting; nitrides; phosphor ceramics; hot isostatic pressing; luminance saturation

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