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

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1 Author(s)
Liao, Michael P. ; DaYeh Univ., Chang-Hua

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 24 )