The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 2010
Filed:
Jan. 25, 2008
Chen-yang Huang, Jhubei, TW;
Hao-min Ku, Taipei, TW;
Shiuh Chao, Hsinchu, TW;
Chu-li Chao, Hsinchu, TW;
Rong Xuan, Yonghe, TW;
Chen-Yang Huang, Jhubei, TW;
Hao-Min Ku, Taipei, TW;
Shiuh Chao, Hsinchu, TW;
Chu-Li Chao, Hsinchu, TW;
Rong Xuan, Yonghe, TW;
Industrial Technology Research Institute, Hsinchu, TW;
National Tsing Hua University, Hsinchu, TW;
Abstract
A light emitting diode (LED) is provided. The LED at least includes a substrate, a saw-toothed multilayer, a first type semiconductor layer, an active emitting layer and a second type semiconductor layer. In the LED, the saw-tooth multilayer is formed opposite the active emitting layer below the first type semiconductor layer by an auto-cloning photonic crystal process. Due to the presence of the saw-tooth multilayer on the substrate of the LED, the scattered light form a back of the active emitting layer can be reused by reflecting and recycling through the saw-tooth multilayer. Thus, all light is focused to radiate forward so as to improve the light extraction efficiency of the LED. Moreover, the saw-tooth multilayer does not peel off or be cracked after any high temperature process because the saw-tooth multilayer has the performance of releasing thermal stress and reducing elastic deformation between it and the substrate.