Journal of Light & Visual Environment
Publication date:
2011-12-01
Volume:
35
DOI:
10.2150/jlve.35.199
Publisher:
The Institute
Author:
Keppens, Arno
Acuña, Paula ; Chen, Huanting ; Deconinck, Geert ; Hanselaer, Peter
Keywords:
Applied Physics
Abstract:
High-power light-emitting diode (LED) efficiencies are strongly dependent on device type and operating conditions. Electrical and optical power measurements are performed on five commercially available phosphor-white LED types for a number of independently enforced forward currents and junction tem-peratures. The experimental results allow for a comparative evaluation of dominant loss mechanisms and their current and temperature dependences.