Huang Hong-Wei, Huang Chien-Wei, Chen Yi-Chian, Shih Hsing-Kun, Cheng Wei-Chih, Liu Chun-Nien, Chiang Chia-Chin
Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan.
Department of Electrical Engineering, National Chung Hsing University, Taichung 402, Taiwan.
Micromachines (Basel). 2024 Jul 24;15(8):946. doi: 10.3390/mi15080946.
A novel five-surface phosphor-in-glass (FS-PiG) structure for high illumination and excellent color uniformity in large-view scale LEDs for sensor light source application is demonstrated. YAG phosphor (YAlO:Ce) was uniformly mixed with ceramic and sintered at 680 °C to form a phosphor wafer. Sophisticated laser engraving was employed on the phosphor wafer to form saddle-shaped large-view scale FS-PiG LEDs. The performance of the FS-PiG LEDs exhibited an illumination of 401 lm, average color temperature (CCT) of 5488 K ± 110 K, and color coordinates (CIE) of (0.3179 ± 0.003, 0.3352 ± 0.003). In contrast to convention single-surface phosphor-in-glass (SS-PiG) LEDs, the performance exhibited an illumination of 380 lm, average CCT of 5830 K ± 758 K, and CIE of (0.3083 ± 0.07, 0.3172 ± 0.07). These indicated that the performance of the FS-PiG LEDs was higher than the SS-PiG LEDs for illumination, CCT, and CIE by 1.7, 7, and 23 times, respectively. Furthermore, the FS-PiG LEDs demonstrate a lower lumen loss of 2% and a reduced chromaticity shift of 5.4 × 10 under accelerated aging at 350 °C for 1008 h, owing to the high ceramic melting temperature of up to 510 °C. In this study, the proposed FS-PiG large-view scale LEDs with excellent optical performance and high reliability may be promising candidates to replace the conventional phosphor-in-organic silicone material used in high-power LEDs for the next generation of sensor light sources, display, and headlight applications.
展示了一种用于传感器光源应用的大视角规模发光二极管（LED）的新型五面玻璃中磷光体（FS-PiG）结构，该结构具有高照明度和出色的颜色均匀性。将钇铝石榴石磷光体（YAlO:Ce）与陶瓷均匀混合，并在680°C下烧结以形成磷光体晶片。在磷光体晶片上采用精密激光雕刻，以形成鞍形大视角规模FS-PiG发光二极管。FS-PiG发光二极管的性能表现为照明度401流明、平均色温（CCT）为5488 K±110 K、色坐标（CIE）为（0.3179±0.003，0.3352±0.003）。与传统的单面玻璃中磷光体（SS-PiG）发光二极管相比，其性能表现为照明度380流明、平均CCT为5830 K±758 K、CIE为（0.3083±0.07，0.3172±0.07）。这些表明，FS-PiG发光二极管在照明度、CCT和CIE方面的性能分别比SS-PiG发光二极管高1.7倍、7倍和23倍。此外，由于高达510°C的高陶瓷熔化温度，FS-PiG发光二极管在350°C下加速老化1008小时后，显示出较低的2%流明损失和5.4×10的色度偏移降低。在本研究中，所提出的具有出色光学性能和高可靠性的FS-PiG大视角规模发光二极管，可能是下一代传感器光源、显示器和前照灯应用中替代高功率发光二极管中使用的传统有机硅磷光体材料的有前途的候选者。
