Particle based investigation of self-heating effect of phosphor particles in phosphor converted light emitting diodes

Azarifar, Mohammad; Cengiz, Ceren; Arık, Mehmet

doi:10.1016/j.jlumin.2020.117782

Cited by 10 publications

(1 citation statement)

References 24 publications

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“…Junction temperature ( T j ) is the largest recommended operating temperature in an electronic structure, which is shown in the thermal resistance network in Figure 1 b. As indicated by the heat generating zones (1 to 3) in the thermal resistance map of a typical LED in Figure 1 b, heat is being generated in an LED at (1) the active region due to non-radiative recombination, inside of the optical cavity due to radiation absorption, electrical structures and semiconductor metal interfaces due to Joule heating [ 22 ], (2) phosphor–polymer composite/coating in a white LED due to Stokes shift and thermal quenching of phosphor [ 23 , 24 , 25 , 26 , 27 ], and (3) outside of the optical cavity due to the radiation absorption and other electrical structures due Joule heating [ 28 , 29 ]. Currently, chip on board, wafer level, and chip-scale packaging are the most popular designs in the LED market for heat dissipation [ 30 ].…”

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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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