Infrared micro-thermography of high-power AlInGaN LEDs using high emissivity (black) in IR and transparent in the visible spectral region coating

Aladov, A. V.; Chernyakov, A. E.; Закгейм, А. Л.

doi:10.1080/17686733.2019.1600318

Cited by 5 publications

(2 citation statements)

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“…As a result of the applied correction algorithm for the adjustment of response and superimposed offset signal images, the reflected radiation was analyzed, and the emissivity was corrected for each pixel. In a more recent study, Aladov et al [ 117 ] suggested the use of a film coating with transparency in the visible region and absorption in the IR region. Application of a special thin-film coating aims to prevent emission absorption of the LED under test conditions and ensure real temperature mapping without falsification.…”

Section: Optical Temperature Probing Methodsmentioning

confidence: 99%

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

2022

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In the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to other lighting systems, LEDs operate at low temperatures while junction temperature (Tj) is is among the main factors dictating their lifespan, reliability, and performance. This indicates that accurate measurement of LED temperature is of great importance to better understand the thermal effects over a system and improve performance. Over the years, various Tj measurement techniques have been developed, and existing methods have been improved in many ways with technological and scientific advancements. Correspondingly, in order to address the governing phenomena, benefits, drawbacks, possibilities, and applications, a wide range of measurement techniques and systems are covered. This paper comprises a large number of published studies on junction temperature measurement approaches for LEDs, and a summary of the experimental parameters employed in the literature are given as a reference. In addition, some of the corrections noted in non-ideal thermal calibration processes are discussed and presented. Finally, a comparison between methods will provide the readers a better insight into the topic and direction for future research.

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Section: Optical Temperature Probing Methodsmentioning

confidence: 99%

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

2022

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“…To face this issue, several researchers have considered assumptions and/or the value of emissivity is set according to reference tables [12]. Other approaches consist in depositing a high emissive thin-film coating on the LED surface [13] [14]. This modify the radiative properties of the LED emitting area, and can affect the thermal behavior of the light source To overcome this problem, a temperature measurement must be performed with a thermocouple and the emissivity setting of the IR unit must be adjusted to match these results [10].…”

Section: Introductionmentioning

confidence: 99%