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Jpn. J. Appl. Phys. 49 (2010) 080210 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Vertical Stand Transparent Light-Emitting Diode Architecture for High-Efficiency and High-Power Light-Emitting Diodes

Chih-Chien Pan¹, Ingrid Koslow¹, Junichi Sonoda¹, Hiroaki Ohta¹, Jun-Seok Ha¹, Shuji Nakamura^1,2, and Steven P. DenBaars^1,2

¹Materials Department, University of California, Santa Barbara, CA 93106-5050, U.S.A.
²Electrical and Computer Engineering Department, University of California, Santa Barbara, CA 93106-9560, U.S.A.

(Received April 20, 2010; accepted June 2, 2010; published online August 5, 2010)

Using a transparent ZnO vertical stand as a submount, a novel Light-emitting diode architecture, which is similar to conventional lighting bulbs, was proposed. The emission power of a blue LED based on c-plane (0001) bulk GaN was increased by 14.2 and 5.1% compared with those of conventional and suspended die packages, respectively. The output power and external quantum efficiency of LEDs respectively reached 31.7 mW and 57.1% at a forward current of 20 mA under direct current conditions. The high thermal conductivity and refractive index of the transparent submount simultaneously resulted in high current operation and high external efficiency.

URL: http://jjap.jsap.jp/link?JJAP/49/080210/
DOI: 10.1143/JJAP.49.080210

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