High Efficiency GaN-based High-voltage Light-emitting Diode Chips and Its Chip-on-board Packaging

Xiao-sheng, 黄晓升 Huang; Hua-mao, 黄华茂 Huang; Hong, 王洪 Wang; Jing, 李静 Li

doi:10.3788/fgxb20153606.0692

Cited by 1 publication

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“…At present, the electro-optic efficiency of LED chips is only about 30%, and about 70% of the energy is converted into heat [2] . LED chips are high heat flux components, and the working temperature should be strictly controlled lower than 110℃ [3] . With the high integration density of the circuit and chips, the heat dissipation is great challenge for high-power LED light.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, some scholars have proposed a variety of solutions to improve the heat dissipation. In terms of heat generation, Huang xiaosheng [3] optimized the width between the chip units, and the electro-optical efficiency increased to 36.83% under certain conditions; However, the electro-optic efficiency is still low, and the contribution is limited to heat dissipation; In the heat transfer, some new substrate materials have been developed [4][5][6] . But, as the light has a variety of materials, it's can't achieve the ideal effect by improving one of them.…”

Section: Introductionmentioning

confidence: 99%

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Research on Integrated High-Power LED Light with Heat Pipe Structure

Zhang¹,

Zhang²,

Li³

2018

dtetr

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To improve the heat dissipation efficiency of high-power LED light, an integrated high-power LED light with heat pipe structure is introduced. The LED chips and circuit are settled inside the heat pipe and are infiltrated into the insulated-working fluid. While the heat is generated from LED chips in the evaporator of the heat pipe, the thermal cycle is active. By the insulated-working fluid evaporating, the heat is transferred directly from the chips to the condenser, so as to reduce the temperature of the chips fleetly, improve the heat dissipation efficiency and life span. In addition, a flat integrated high-power LED light is made, and a contrast experiment is designed to test its heat dissipation. The insulated-working fluid chosen for the experiment is non-aqueous ethanol, and the filling rate is 60%. According to experimental result, with full power supplied, the temperature of the integrated LED light grew slower than the common high-power LED light. And the temperature is stabilized at 74℃, while the common light is over 100℃. It's proved that the integrated LED light with heat pipe structure has better performance in heat dissipation.

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Section: Introductionmentioning

confidence: 99%