- 學位論文
混入碳族材料之環氧樹脂固晶膠對高功率發光二極體散熱提升之研究
Die Bonding Epoxy Mixed with Carbon Group for Enhancement of Thermal Dissipation in High Power Light Emitting Diodes
摘要
發光二極體（Light Emitting Diode，LED）是一種符合綠色環保的產品，與傳統光源相比具有省電以及壽命長的優點，相對高功率LED而言，是一種發熱密度高的元件，其發熱能量遠遠比低功率LED還要高。LED為電能轉換光能的元件，轉換過程中，只有20％的電能會轉換成光能，其餘的均成為熱能且堆積在P-N接面處，過多的熱會導致LED的性能衰減。另外，環氧樹脂固晶膠本身的熱傳導很差，故本論文透過碳族材料中的人造鑽石及奈米碳管兩種熱接面材料混入環氧樹脂中，增加環氧樹脂固晶膠在LED晶粒與散熱支架之間的熱傳導，改善高功率LED的散熱問題，以提高使用壽命。 結果顯示：沒有在環氧樹脂內混入人造鑽石或奈米碳管的固晶膠之LED接面溫度為128℃，當人造鑽石在環氧樹脂固晶膠內的比例從5%~20%，接面溫度也跟隨著人造鑽石比例之多寡而下降，與5%之奈米碳管固晶膠比起來，人造鑽石本身亦有散熱特性，而且光通量也比5%之奈米碳管來的高。
並列摘要
LED is a kind of green products, compared with traditional light sources have the advantages of energy saving and long life, relatively high power LED, is a high density of thermal device, much of its thermal is even higher than the low-power LED. LED is electrically converted into light device, in conversion process, only 20% of the energy is converted into light, other energy converted into thermal and are stacked at the PN junction, excessive thermal will cause the LED performance degradation. In addition, epoxy its poor thermal conductivity, in this paper, using artificial diamonds and carbon nanotubes mixing with epoxy, increase thermal conductivity between LED chip and lead frame, improve the high-power LED thermal problems and increase its life. The results showed, there is no artificial diamonds or carbon nanotube mixed with epoxy of the LED junction temperature of 128℃ , when the artificial diamonds in the proportion of epoxy from 5% to 20%, also followed to reduce junction temperature, and 5% of the carbon nanotubes compared with, artificial diamond itself has thermal dissipation characteristics, and luminous flux is higher than 5% of the carbon nanotubes.