자동차용 레이저 헤드램프를 위한 형광체 세라믹 제조 및 발광 특성 분석
Fabrication and analysis of luminous properties of phosphor ceramic for laser headlamp in automotive application
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초록
본 연구에서는 차세대 자동차 레이저 헤드램프 적용을 위하여 분무건조법을 통하여 가넷 구조를 갖는 구형의YAG : Ce 형광체를 합성하였으며 이를 기반으로 형광체 세라믹을 제조하고 광학적 특성을 분석하였다. 분무건조법 기반으로 합성된 구형의 YAG : Ce 형광체를 이용한 형광체 세라믹의 두께를 100 μm, 150 μm, 200 μm로 조절하여 두께에 따른 광변환 효율, 열 소광, 휘도 및 색온도의 광학적 특성을 비교하였다. 연구 결과, 양자효율 및 광속 값은 두께가 150 μm 일 때,가장 높게 나타났다. 본 연구 결과는 기존의 액상법을 기반으로 한 YAG:Ce 나노 형광체 제조의 고 비용, 저 수율 등의문제점을 개선한 방법으로 향 후, 형광체 세라믹 제조에 큰 역할을 할 수 있을 것이라 기대된다.
Abstract
In this study, phosphor ceramics were fabricated, and optical properties were analyzed for application to nextgeneration automotive laser headlamps by using a spherical YAG : Ce phosphor with a garnet structure synthesized based on the spray drying method. The thickness of phosphor ceramic using spherical YAG : Ce phosphor was obtained with 100 μm, 150 μm, and 200 μm to investigate the effect of thickness on optical properties such as light conversion efficiency,heat dissipation, luminance and color temperature. The results of this study are expected to play a significant role in the manufacturing process for the fabrication of phosphor ceramic by solving issues such as the high cost and low yield in the conventional liquid method to manufacture YAG : Ce nano fluorescent materials.
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