A comparative study for the junction temperature of green light-emitting diodes

Name: A comparative study for the junction temperature of green light-emitting diodes
Author: Özlük, Burak, Muslu, Ahmet Mete, Arık, Mehmet

İsim	A comparative study for the junction temperature of green light-emitting diodes
Yazar	Özlük, Burak, Muslu, Ahmet Mete, Arık, Mehmet
Basım Tarihi:	2019-10
Basım Yeri	- IEEE
Konu	Forward voltage technique, Green light-emitting diode (LED), Junction temperature measurement, LED, LED lens, Thermal imaging
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	2156-3950
Kayıt Numarası	0ae59986-cf41-4d5e-9414-b4b84675067d
Lokasyon	Mechanical Engineering
Tarih	2019-10
Notlar	TÜBİTAK
Örnek Metin	Solid-state lighting devices offer a wide variety of color options applicable for general and automotive lighting, various display systems, and a number of niche applications. As they get smaller, generated heat fluxes become more intense and induce serious lifetime and performance issues. Although the light output from light-emitting diodes (LEDs) is the most efficient at a narrow optical spectrum compared with conventional lighting sources, they are still not adequate to satisfy consumer demands due to considerable amounts of lost energy and emerging thermal issues. On the other hand, it is possible to achieve effective thermal solutions if the junction temperature of LEDs is precisely determined. A number of techniques have been proposed for the junction temperature measurement of LEDs such as forward voltage change and infrared (IR) thermal imaging. In this study, green LEDs were studied to observe optothermal interactions using a number of proposed junction temperature measurement techniques. The effect of an LED lens on junction temperature and optical extraction was investigated by examining the change in the thermal and optical properties of an LED chip after the LED lens was removed. In addition, the results of the green LED were compared with a 450-nm blue LED and verified with numerical findings. As a result, it has been determined that the thermal behavior of LEDs is significantly affected by electrical conditions, since the junction temperature of green and blue LEDs has risen by around 45% after the operating current has been increased from 200 to 500 mA.
DOI	10.1109/TCPMT.2019.2929172
Cilt	9

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A comparative study for the junction temperature of green light-emitting diodes

Yazar Özlük, Burak, Muslu, Ahmet Mete, Arık, Mehmet

Basım Tarihi 2019-10

Basım Yeri - IEEE

Konu Forward voltage technique, Green light-emitting diode (LED), Junction temperature measurement, LED, LED lens, Thermal imaging

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 2156-3950

Kayıt Numarası 0ae59986-cf41-4d5e-9414-b4b84675067d

Lokasyon Mechanical Engineering

Tarih 2019-10

Notlar TÜBİTAK

Örnek Metin Solid-state lighting devices offer a wide variety of color options applicable for general and automotive lighting, various display systems, and a number of niche applications. As they get smaller, generated heat fluxes become more intense and induce serious lifetime and performance issues. Although the light output from light-emitting diodes (LEDs) is the most efficient at a narrow optical spectrum compared with conventional lighting sources, they are still not adequate to satisfy consumer demands due to considerable amounts of lost energy and emerging thermal issues. On the other hand, it is possible to achieve effective thermal solutions if the junction temperature of LEDs is precisely determined. A number of techniques have been proposed for the junction temperature measurement of LEDs such as forward voltage change and infrared (IR) thermal imaging. In this study, green LEDs were studied to observe optothermal interactions using a number of proposed junction temperature measurement techniques. The effect of an LED lens on junction temperature and optical extraction was investigated by examining the change in the thermal and optical properties of an LED chip after the LED lens was removed. In addition, the results of the green LED were compared with a 450-nm blue LED and verified with numerical findings. As a result, it has been determined that the thermal behavior of LEDs is significantly affected by electrical conditions, since the junction temperature of green and blue LEDs has risen by around 45% after the operating current has been increased from 200 to 500 mA.

DOI 10.1109/TCPMT.2019.2929172

Cilt 9