Title :
DC Current-Induced Rollover of Illumination Efficiency of GaN-Based Power LEDs
Author :
Liao, Michael P.
Author_Institution :
DaYeh Univ., Chang-Hua
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);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.908353
