Measuring the surface temperature of light-emitting diodes by thermoreflectance

Autor:	Dong-Soo Shin, Dong-Guang Zheng, Jong-In Shim
Rok vydání:	2021
Předmět:	Surface (mathematics) Materials science Physics and Astronomy (miscellaneous) business.industry law General Engineering General Physics and Astronomy Optoelectronics Junction temperature business Light-emitting diode law.invention
Zdroj:	Japanese Journal of Applied Physics. 60:052003
ISSN:	1347-4065 0021-4922
DOI:	10.35848/1347-4065/abf90c
Popis:	As the latest applications of LEDs require more harsh operating conditions, understanding the device thermal properties becomes more essential for further improving the device efficiencies. In applications where heat dissipation can be a critical issue, thermoreflectance (TR) can be utilized as a useful noncontact measurement technique for analyzing the thermal properties. In this paper, we investigate the TR method of measuring the surface temperature, using a lateral-type blue LED chip under high-power operation. The TR we employ measures the change in reflectivity from the Au metal electrode. By comparing with surface/junction temperatures measured by other methods based on the thermocouple and the forward voltage, we find that the TR method can provide accurate and reliable results of measuring the surface temperature of modern LEDs. A useful insight can also be obtained from the temperature distribution on the LED chip surface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::47dfd29b9f128f211dc36524ef84449c https://doi.org/10.35848/1347-4065/abf90c Zobrazit plný text záznamu