Huang, H.-W.; Huang, C.-W.; Chen, Y.-C.; Shih, H.-K.; Cheng, W.-C.; Liu, C.-N.; Chiang, C.-C.; Cheng, W.-H. A Novel Five-Surface Phosphor-in-Ceramic for High Illumination and Excellent Color Uniformity in Larger Scale LEDs. Preprints2024, 2024041842. https://doi.org/10.20944/preprints202404.1842.v1
APA Style
Huang, H. W., Huang, C. W., Chen, Y. C., Shih, H. K., Cheng, W. C., Liu, C. N., Chiang, C. C., & Cheng, W. H. (2024). A Novel Five-Surface Phosphor-in-Ceramic for High Illumination and Excellent Color Uniformity in Larger Scale LEDs. Preprints. https://doi.org/10.20944/preprints202404.1842.v1
Chicago/Turabian Style
Huang, H., Chia-Chin Chiang and Wood-Hi Cheng. 2024 "A Novel Five-Surface Phosphor-in-Ceramic for High Illumination and Excellent Color Uniformity in Larger Scale LEDs" Preprints. https://doi.org/10.20944/preprints202404.1842.v1
Abstract
A novel five-surface phosphor-in-ceramic (FS-PiC) for high illumination and excellent color uniformity in larger-scale LEDs for sensor light source application is demonstrated. YAG phosphor (Y3Al5O12:Ce3+) was uniformly mixed with ceramic and sintered at 680°C to form a phosphor wafer. A sophisticated laser engraving was employed on the phosphor wafer to form a saddle-shaped large-scale FS-PiC LEDs. The performance of the FS-PiC LEDs exhibited the illumination of 401lm, average color temperature (CCT) of 5488K±110K, and color coordinates (CIE) of (0.3179±0.003, 0.3352±0.003). In contrast to convention single-surface phosphor-in-ceramic (SS-PiC) LEDs, the performance exhibited the illumination of 380lm, average CCT of 5830K±758K, and CIE of (0.3083±0.07, 0.3172±0.07). These indicated that the performance of the FS-PiC LEDs was higher than the SS-PiC LEDs for illumination, CCT, and CIE of 1.1, 7, and 23 times, respectively. Furthermore, the FS-PiC LEDs demonstrate lower lumen loss of 2% and less chromaticity shift of 5.4x10-3 under accelerated aging at 350°C for 1008 hours, owing to the high ceramic melting temperature of up to 510°C. In this study, the proposed FS-PiC larger-scale LEDs having excellent optical performance and high reliability may be the promising candidates to replace the convention phosphor-in-organic silicone material used in high-power LEDs for the next generation of sensor light sources, display, and headlight applications.
Engineering, Electrical and Electronic Engineering
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