Enhancement of Light Extraction Efficiency Using Lozenge-Shaped GaN-Based Light-Emitting Diodes

Author

Jang, Dong-Hyun ; Shim, Jong-In ; Shin, Dong-Soo

Author_Institution

Dept. of Electr. & Comput. Sci. Eng., Hanyang Univ., Ansan

Volume

21

Issue

12

fYear

2009

fDate

6/15/2009 12:00:00 AM

Firstpage

760

Lastpage

762

Abstract

We have demonstrated both theoretically and experimentally that a lozenge-shaped light-emitting diode (LED) enhances light extraction efficiency compared with a conventional rectangular LED. The total light output power of the lozenge-shaped LED on a transmitter optical can (TO-can)-type package shows an increase of 12% at an injection current of 20 mA when compared with that of a rectangular LED. Moreover, the series resistance and the forward voltage of the lozenge-shaped LED slightly decrease compared with those of the rectangular LED. The far-field emission pattern shows that the light escaping from the lozenge-shaped LED along the horizontal direction is larger than that from the rectangular LED.

Keywords

II-VI semiconductors; gallium compounds; light emitting diodes; wide band gap semiconductors; GaN; current 20 mA; far-field emission pattern; injection current; light extraction efficiency; light-emitting diodes; series resistance; transmitter optical can-type package; Extraction efficiency; GaN; light-emitting diodes (LEDs); lozenge; shaping;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2009.2017504

Filename

4801722