| Summary: | 碩士 === 崑山科技大學 === 光電工程研究所 === 106 === In this paper we discuss Effects of SiO2/TiO2 hybrid Micro-particles doped Encapsulation on Light and Thermal Characteristic of LEDs.The research is divided into two experiments: Experiment one: Simultaneous doping of SiO2 and TiO2 microparticles encapsulating silicon on the light output and thermal characteristics of the blue LED.Experiment 2: The light output and thermal characteristics of the blue LED in Experiment 1 were improved by layered stacking of doped TiO2 microcapsules/doped SiO2 microparticles.
Experiment 1 The doping of mixed micron materials in the encapsulated silicon for the measurement of light and thermal properties. The encapsulated silicon was doped with TiO2 (0.02 wt%) and SiO2 (2 wt%), respectively, compared with the encapsulated silicon without doped micro-particles. After encapsulating the blue LED, the injected current was 350 mA and the light output was 521.67 mW and 523.98 mW, Compared with silicone, they increased by 0.7% and 1.2% respectively. The maximum operating current of the variable current silicone is 0.8A, the TiO2 and SiO2 are 0.85 A, and the maximum light output is 1137 mW, 1171 mW, and 1215 mW. In the measurement of the junction temperature of different doped materials, SiO2 is the best, and the junction temperature is 150.1 °C, which is 2.7 °C higher than that of silicone.
In experiment 2, the mixed TiO2 and SiO2 microparticle tannins and the TiO2 and SiO2 layered stacking methods were used.The layered structure of the packaging material affects the light output, and the encapsulating phenyl silicone encapsulation. Compared with the encapsulant of Experiment 1, the injection current was 350 mA, and the light output was 521.83 mW and 528.88 mW, respectively. Compared with silicone, they increased by 0.8 % and 2.1 % respectively. Mixing and layered encapsulation the maximum operating current of the silicone is 0.85 A, and the maximum light output is 1206 mW and 1230 mW. The interface temperatures were 151.7 °C and 147.0 °C, respectively, which were 1.1 °C and 2.8 °C lower than Phenyl Encapsulant Silicone. The layered structure effectively reduces the internal reflection phenomenon. The light output is increased. However, the light output of the hybrid microparticle device is lower than that of a single SiO2.Because the size of TiO2 (0.3 μm) and SiO2 (2 μm) stacked ,causes some parts of the SiO2 scattering function and decreases the light output. The layered structure does not have a stack of micro-particles and particles, so the layered stack has the best light output and junction temperature.
Through the experiments in this paper, we learned that each material with different characteristics can improve light output by being doped in the encapsulation. First use of high refractive index materials to reduce the internal reflection phenomenon between the encapsulation,improve the light output efficiency.
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