有些塑膠封裝的材質會因為熱的緣故而變黃，導致局部波長的光被吸收而影響波長。在藍光,UV LED 裡,當封裝材料長期受到短波長光或紫外光照射時,會使封裝材料產生黃變,LED亮度會因此下降,而因此如何提升封裝材料的抗UV性和耐熱性,就成為一個很重要的改良問題.
Most LED are covered with a protective sealant to prevent electrical and environmental damage, but also to increase the light output and minimize heat build-up. Traditionally, most still epoxy sealant and other organic materials because of their hardness, transparency and low cost more in line with application requirements.
Some plastic packaging materials because of heat yellowing sake, leading to local wavelengths of light are absorbed and affect wavelengths. Blu-ray, UV LED inside, when the packaging material has long been short-wavelength light or ultraviolet radiation, causes yellowing packaging materials, LED brightness will be diminished, and therefore how to improve the packaging materials UV resistance and heat resistance, it is It has become a very important issue improved.
Therefore, this study tries to put sealant in plastic instead of glass, see if you can improve the ultraviolet light yellowing problem, and the temperature of the epoxy resin and discoloration caused by type variable. But also we hope that after the closure of plastic material to the glass, but also to have the same luminous phenomenon.