Determining junction temperature based on material properties and geometric structures of LEDs

Ho, Ching-Yen; Wan, Song-Feng; Chen, Bor-Chyuan; Li, Long-Gen; Fan, Shilei; Xiong, Chang-Wei

doi:10.1007/s11082-018-1663-1

Cited by 4 publications

(1 citation statement)

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“…Junction temperature cannot be directly measured [4]. In literature, numerous experimental analysis has been carried out in terms of temperature-sensitive parameters (TSP) in three categories namely electrical methods, optical methods, and physical contact methods to accurately estimate junction temperature and study the dependency of junction temperature on the optical and electrical properties of the LEDs [5]. The most often used primary physical contact method is thermocouple but unfortunately, its use is limited due to the small size of the LED chip [6].…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Optical-Electrical-Thermal Characteristics of RGB LEDs

Srividya

Srinivasan

Netto

2021

J. Nano- Electron. Phys.

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Heat dissipation is the main problem of concern when working with high power light emitting diodes. If not controlled, the optical and electrical performance of the luminaire can get affected. A higher junction temperature induces variations in forward voltage, luminous lux, correlated color temperature, color point and peak wavelength. LED manufacturers have their operating ranges for junction temperature and driving current. Operating LEDs beyond the operating range of current may initially provide high luminous flux, but junction temperature might increase beyond the range specified, resulting in very fast degradation of luminous flux. Also, elevated junction temperatures can severely affect the lifetime and reliability of LEDs. Hence, measurement and control of junction temperature within the maximum operating range through appropriate thermal design are vital for avoiding performance degradation of the LED luminaire. This paper shows an insight on the experimentations carried out to measure the junction temperature and analyze its effect on the electrical and optical parameters of RGB LEDs within the maximum operating temperature.

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Section: Introductionmentioning

confidence: 99%