DC Current-Induced Rollover of Illumination Efficiency of GaN-Based Power LEDs

Author

Liao, Michael P.

Author_Institution

DaYeh Univ., Chang-Hua

Volume

19

Issue

24

fYear

2007

Firstpage

2000

Lastpage

2002

Abstract

Pulse drive currents were utilized to investigate dc current-induced rollover of illumination efficiency of GaN-based power light-emitting diodes (LEDs). By using the pulse drive currents, we can separate the effects that junction temperature and current injection have on dc current-induced rollover of illumination efficiency of GaN-based power LEDs. Comparing the measurement results obtained from pulse and dc drive currents, we verified that junction temperature and current injection were the major causes of dc current-induced rollover of illumination efficiency of power LEDs.

Keywords

III-V semiconductors; gallium compounds; light emitting diodes; DC current-induced rollover; GaN; GaN-based power LED; current injection; dc drive currents; illumination efficiency; junction temperature; pulse drive currents; Calibration; Current measurement; Forward contracts; Light emitting diodes; Lighting; Optical saturation; Power generation; Pulse measurements; Temperature measurement; Voltage; Current injection; illumination efficiency; junction temperature; light-emitting diode (LED);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.908353

Filename

4390069