Abstract: White LED applications have become more and more widely used in the field of lighting. Especially the energy saving and environmental protection of LED has been recognized by the world. How to improve the life of white LEDs and reduce the attenuation of white LEDs into the research and development of packaging, this paper will improve white LEDs. Attenuation is discussed in terms of materials.
With the advent of blue LEDs, white LEDs can be easily obtained using a combination of phosphors and blue LEDs, which is the most mature white light package in the industry. At present, white LED has become an illumination source, and general household lighting has become a reality. However, during the use process, more white light products have a large attenuation and cannot be suitable for the lighting market. Lehman Optoelectronics has increased the research and development of white light for the high-end market demand, and developed low-attenuation white light products by changing the packaging process and material matching. The lighting industry is slightly weak. The following are the five experiences that our company has summarized in the packaging process, and communicate with colleagues in the industry, in order to contribute to the improvement of white LED packaging technology.
First, the impact of the wafer on the light decay of white LED
From the results of the current experiments, the effects of wafers on light decay fall into two broad categories:
The first is that the material of the wafer is different, resulting in different attenuation. Currently, the commonly used blue wafer substrate is made of silicon carbide and sapphire. The general structure of silicon carbide is designed as a single electrode, and its thermal conductivity is better. The sapphire is generally designed as a double electrode, which is difficult to heat. Export, the thermal conductivity is poor;
The second is the size of the wafer. When the material of the wafer is the same, the difference in size is different.
Second, the effect of solid crystal primer on the light decay of white LED
The solid-state adhesives commonly used in the white LED packaging industry are epoxy resin, silicone resin, and silver glue. Each of the three has its own advantages and disadvantages, and should be considered comprehensively when selecting. Epoxy resin insulation has poor thermal conductivity, but high brightness; silicone resin has better thermal conductivity than epoxy resin, and has high brightness. However, due to the proportion of silicon component, the silicone resin and the ring in the fluorescent rubber remain on the side of the solid wafer. When the oxygen resin is combined, the interlayer phenomenon will occur. After the thermal shock, the peeling will cause the dead lamp; the thermal conductivity of the silver gel is better than the former two, which can prolong the life of the LED chip , but the absorption of light by the silver paste is compared. Large, resulting in low brightness. For the two-electrode blue chip, when the crystal is fixed with silver glue, the control of the amount of glue is also very strict, otherwise it is easy to generate a short circuit, which directly affects the yield of the product.
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