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Proceedings Paper

Bell-shaped light emitting diodes (BS-LED) with a 45 degree corner reflector, deep side-wall, and microlens
Author(s): Eun-Hyun Park; Jae-Ho Kim; Tae-Kyung Yoo; Young-Se Kwon
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Paper Abstract

A new type Bell Shaped Light Emitting Diode(BS-LED) with a circular 45 degree(s) corner reflector, deep side-wall and microlens is proposed and fabricated. Because the light of in-plane radiation in the active layer of Surface Emitting LED(SE-LED) can be extracted to emission surface by a circular 45 degree(s) corner reflector, the output power saturation phenomena that occur due to the in-plane superluminescence can be considerably improved. So, the light output power and the linearity of light-current curve can be improved efficiently by the corner reflector. The deeply etched side-wall can dramatically improve the external quantum efficiency of LED by side-wall reflection and photon recycling mechanism. Microlens is formed on light emission surface to improve the beam pattern. The fabricated BS-LED shows the dramatically improved external quantum efficiency up to about 8 times than that of conventional LED. The output power improvement is simulated as device design parameters. The BS-LED is characterized using spectrum, near-field pattern and light-current measurement.

Paper Details

Date Published: 6 June 2002
PDF: 12 pages
Proc. SPIE 4641, Light-Emitting Diodes: Research, Manufacturing, and Applications VI, (6 June 2002); doi: 10.1117/12.469213
Show Author Affiliations
Eun-Hyun Park, Epivalley Co., Ltd. (South Korea)
Jae-Ho Kim, Korea Advanced Institute of Science and Technology (South Korea)
Tae-Kyung Yoo, Epivalley Co., Ltd. (South Korea)
Young-Se Kwon, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 4641:
Light-Emitting Diodes: Research, Manufacturing, and Applications VI
E. Fred Schubert; H. Walter Yao, Editor(s)

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