Author
Muslu, Ahmet Mete, Özlük, Burak, Arık, Mehmet
Publication Date
2021-03
Publication Place
-
ASME
Subject
Computational fluid dynamics (CFD), Forward voltage, Junction temperature measurement, LED dome, Monochromatic LEDs, Red LED, Thermal imaging
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1043-7398
Record ID
f20ada05-394f-492c-a090-134a71fb0c9a
Library Location
Mechanical Engineering
Date
2021-03
Notes
TÜBİTAK
Sample Text
Monochromatic light emitting diodes (LEDs) are getting more attention day by day for a very wide range of applications such as general lighting, signage, automotive lighting, display, water purification, and skin imaging. While they are taking place in a large number of applications, thermal challenges associated with the operation of LEDs have become a significant issue to address since their performance is greatly affected by thermal conditions. Thus, this study focuses on identifying thermal, optical, and electrical characteristics of an AlGaInP-based red LED considering the impact of the LED dome on the chip performance. The junction temperature measurement results obtained with forward voltage change method were validated with thermal imaging method (TIM) and computational models. It was observed that the LED dome may critically affect the thermal, optical, and electrical behaviors of the LED chip. In fact, a 3.7% increase in junction temperature and a 6.1% drop in optical conversion efficiency were found at the normal operation of the red LED after the LED dome was removed. The results were also compared with a blue LED, and lower junction temperatures were measured for the red LED at each driving current. The difference in junction temperature became even more noticeable at higher driving currents. Results have shown a good agreement between three different methods with a maximum variation of 6.9%.
DOI
10.1115/1.4047381
Cilt
143
