DocumentCode
759257
Title
Enhancement of InGaN–GaN Indium–Tin–Oxide Flip-Chip Light-Emitting Diodes With TiO 
–SiO Multilayer Stack Omnidirectional Reflector
Author
Lin, C.H. ; Lai, C.F. ; Ko, T.S. ; Huang, H.W. ; Kuo, H.C. ; Hung, Y.Y. ; Leung, K.M. ; Yu, C.C. ; Tsai, R.J. ; Lee, C.K. ; Lu, T.C. ; Wang, S.C.
Author_Institution
Inst. of Electro-Opt. Eng., Nat. Chiao Tung Univ., Hsinchu
Volume
18
Issue
19
fYear
2006
Firstpage
2050
Lastpage
2052
Abstract
Enhancement of light extraction of GaN-based flip-chip indium-tin-oxide light-emitting diodes (FC ITO LEDs) with an omnidirectional reflector (ODR) is presented. The ODR consisting of alternating layers of TiO2 and SiO2 is designed to possess a complete photonic bandgap within the blue region of interest, and it is fabricated by E-beam deposition. At a driving current of 300mA and a chip size of 1 mmtimes1 mm, the light output power of the FC ITO LEDs with the ODR reaches 156 mW. This is an enhancement of 31% when compared with the same device with an Al mirror instead. Furthermore, by examining the radiation patterns, the FC ITO LED with the ODR shows stronger enhancement around the vertical direction. Our work offers promising potential for enhancing output powers of commercial light-emitting devices
Keywords
electron beam deposition; flip-chip devices; gallium compounds; indium compounds; light emitting diodes; optical fabrication; optical multilayers; photonic band gap; wide band gap semiconductors; In2-xSnxO3-y; InGaN-GaN; InGaN-GaN indium-tin-oxide flip-chip light-emitting diodes; TiO2-SiO2; TiO2-SiO2 multilayer stack; e-beam deposition; omnidirectional reflector; photonic bandgap; Distributed Bragg reflectors; Indium tin oxide; Light emitting diodes; Mirrors; Nonhomogeneous media; Optical polarization; Photonic band gap; Photonic crystals; Power generation; Reflectivity; Flip-chip (FC); GaN; indium–tin–oxide (ITO); light-emitting diodes (LEDs); omnidirectional reflector (ODR); one-dimensional photonic crystal (1-D PhC);
fLanguage
English
Journal_Title
Photonics Technology Letters, IEEE
Publisher
ieee
ISSN
1041-1135
Type
jour
DOI
10.1109/LPT.2006.883330
Filename
1703632
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