In this thesis, we focus on the light extraction efficiency of LED package. The light extraction efficiency of LED is limited by Fresnel Loss and total internal reflection, which result in the rare amount of luminious flux from LED. In order to improve the light extraction efficiency of high power LED package, we study the design of package structure and the matching refractive index of silicone resins. Instead of using one-layer structure, we use multi-layer structure which can raise the light extraction efficiency and the brightness. In order to destroy the total internal reflection, we change the geometric appearance and the interior structure and furthermore we use the different refractive index of silicone resins to decrease Fresnel Loss.
In this work, we use the multi-layer structure whose the refractive indexes of the inner silicone resin and the outer silicone resin are 1.55 and 1.41 respectively. When the geometric appearance is convex, the light extraction efficiency of LED package can reach to 70%. Furthermore, by
applying this result on phosphor conversion light emitting diode, we can get high efficiency of white light.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0706106-175657 |
| Date | 06 July 2006 |
| Creators | Chen, Chien-chung |
| Contributors | Sheng-lung Huang, Mei-ying Chang, Wood-hi Cheng, San-liang Lee, Tsong-sheng Lay |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706106-175657 |
| Rights | not_available, Copyright information available at source archive |
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