前瞻性發光二極體散熱與光杯之研究

Investigation of Novel Light Emitting Diodes with Thermal Dissipating and Micro-Reflector-Cup Structures

本論文主要研究氮化鎵發光二極體 （LED） 背面微結構之散熱機構及將側光導正之反射杯結構設計與製造。利用精密電鑄技術研製一散熱結構，藉由銅高熱傳特性 （400 W/m‧ K） 直接將熱導出，而反射杯則是利用精密電鑄製程製作出碗狀或杯狀之反射杯，藉此提供不同光形與提高LED 正向光之強度。此外，本研究無須藉由其他黏著劑，直接於 LED 晶粒上製作出散熱及反射杯，可將LED 產生的熱能直接導出並改變光束路徑。另一方面，本研究使用無光罩自我對準與利用自組裝技術中親疏水性的特性，於LED 上直接製作出不同形狀之光杯，利用LED 與光阻的相互遮光與曝光的交互作用，達到自我對準的目的與不同的光杯應用在不同的產品上。藉以上之設計與製程開發可研製出一體成型具有光杯與散熱結構的高功率發光模組。

In this paper, the back-side microstructure and side-emitting lightguidereflective cup of GaN-based light emitting diodes (LEDs) werestudied and fabricated. Using precise electroplating technology tofabricate a thermal dissipation structure, the heat created from the LEDjunction can be directly dissipated by copper due to its high thermalconductivity (400 W/m ⋅ K). Bowl-shaped or cup-shaped reflectors can be also obtained to enhance the LED intensity and control LED lightpatterns.In addition, the LEDs with thermal dissipating structure do not needany adhesives, but can be directly fabricated with thermal dissipation andreflection cup functions on the back-sides of LED chips. As a result heatcan be derived directly and change the light patterns. Finally, the LEDsused in these experiments were produced using maskless, self-aligningprocesses. These methods may improve the thermal and optical quality ofhigh-power LEDs.