基于倒裝芯片制備白光LED燈絲研究
[Abstract]:Under the trend of banning incandescent lamp in the world, LED filament has become a new light source which can replace incandescent lamp with the characteristics of energy saving, environmental protection, unique shape and full angle luminescence. The inverted LED chip (FC-LED) has better heat dissipation structure and light efficiency. Using the inverted chip to prepare LED filament can effectively improve the heat dissipation performance of the filament. In this paper, the white LED filament was prepared by high temperature tin paste solid crystal inversion chip and phosphor coated on the surface. The effects of substrate, solid solder and phosphor coating on the chip shearing force, optoelectronic and thermal properties of inverted LED filament were studied. The results showed that the light efficiency of ceramic substrate (125.2 Lm/W) was higher than that of aluminum substrate (118.4 Lm/W), and that of ceramic substrate was better than that of aluminum substrate (118.4 Lm/W). The surface temperature of the aluminum substrate (332.2 K / 336.6K) is lower than that of the ceramic substrate (339.7 K / 341.6K). The heat distribution of the aluminum substrate is more uniform, which is suitable for the filament with high power and high heat dissipation. Under the direct baking condition, the flux produced more holes than tin paste at the joint. After 1000 hours of aging, the light flux and tin paste samples were maintained by 87.07% and 91.51%, respectively. When the thickness of solder layer increased from 32 渭 m to 82 渭 m, the shear stress increased by 135 and the voltage of single chip decreased by 2.56 MV (30 mA), and 1.5 KV higher than 30 渭 m). The difference of positive and negative color temperature is 235K, the luminous effect is 112Lm / W, the difference of positive and negative color temperature is 285K, and the luminous effect is 115Lm / W. after the concentration of the reverse phosphor is reduced to 20% of the concentration of the positive phosphor, The difference of positive and negative color temperature is 53 K, the light efficiency is up to 121 Lm / W, and the change of concentration has little effect on the filament temperature. The test results provide a low cost, high light efficiency, suitable for white inverted LED filament solid crystal process and phosphor coating process.
【學(xué)位授予單位】:長春理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM923.34
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