The performance of GaN LEDs using an embedded finger-type contact

Ray-Hua Horng, Kun Ching Shen, Chao Yu Pai, Dong Sing Wuu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

High performance of GaN light-emitting diodes with a finger-type embedded contact (F-LEDs) was demonstrated on a Cu substrate for improved thermal management and increased efficiency. In contrast to common sapphire-based LEDs (C-LEDs) and the wing-type embedded LEDs (W-LEDs), the use of the finger-type embedded contact not only reduces the effect of the current crowding of W-LEDs to achieve a uniform current injection but also eliminates the problem of light shading of C-LEDs to obtain more output power. At 350 mA, the output power of the three LEDs was measured to be 329.39, 284.52, and 236.38 mW for the C-LED, W-LED, and F-LED, respectively; representing that the F-LED in output intensity was raised 39.3% and 20.3% higher than that in the C-LED and the W-LED. Similarly, a 63.61% increase of output power of F-LED was obtained as compared to the C-LED case at 700 mA current injection. At this point, the efficiency droop of F-LED is 33.7%, which is lower than that of 44.1% and 53.5% in W-LED and C-LED, respectively; results are promising for the development of high performance LEDs using the finger-type embedded contact.

Original languageEnglish
Title of host publicationLight-Emitting Diodes
Subtitle of host publicationMaterials, Devices, and Applications for Solid State Lighting XVIII
PublisherSPIE
ISBN (Print)9780819499165
DOIs
StatePublished - 1 Jan 2014
EventLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII - San Francisco, CA, United States
Duration: 4 Feb 20146 Feb 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9003
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVIII
CountryUnited States
CitySan Francisco, CA
Period4/02/146/02/14

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