Investigation of combined optical and thermal effects on phosphor converted light-emitting diodes with liquid immersion cooling

Name: Investigation of combined optical and thermal effects on phosphor converted light-emitting diodes with liquid immersion cooling
Author: Kahvecioğlu, Halil İbrahim, Tamdoğan, E., Arık, Mehmet

İsim	Investigation of combined optical and thermal effects on phosphor converted light-emitting diodes with liquid immersion cooling
Yazar	Kahvecioğlu, Halil İbrahim, Tamdoğan, E., Arık, Mehmet
Basım Tarihi:	2018
Basım Yeri	- SPIE
Konu	Light-emitting diode efficiency, Light-emitting diode optics, Remote phosphor coating, Liquid cooling
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	0091-3286
Kayıt Numarası	2a57e831-8565-49ad-9067-d17d79dbfe6f
Lokasyon	Mechanical Engineering
Tarih	2018
Örnek Metin	The inclusion of phosphor into a high brightness light-emitting diode (LED) package is a complicated task since LEDs are encapsulated with a phosphor and epoxy mixture to convert blue photons to white light. Moreover, this common practice may cause high temperatures and fractures in the gold wire bonds of the chip or solder balls due to local heating and thermal stresses leading to device failures. Furthermore, at elevated junction temperatures, the light conversion efficiency of the phosphor reduces and decreases the overall optical efficiency of an LED. Although, remote phosphor technique has been already applied to LED systems, the high power requirements have needed better performing methods. Thus, an immersion liquid cooled remote phosphor-coated system has been proposed and experimentally and computationally investigated. First, a set of experiments was performed, which includes the combined effects coming from both optical and thermal improvements with the proposed liquid cooled remote phosphor-coated technique, where the total light extraction enhancement was obtained in excess of 25%. Then, the same problem has been computationally studied for investigation of solely optical enhancements, which has shown that remote phosphor-coated LED package with a liquid coolant of suitable refractive index at the optical path has enhanced the overall lumen performance about 13%, whereas the rest of the improvements of 12% were due to thermal enhancements.
DOI	10.1117/1.OE.57.5.055101
Cilt	57

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Investigation of combined optical and thermal effects on phosphor converted light-emitting diodes with liquid immersion cooling

Yazar Kahvecioğlu, Halil İbrahim, Tamdoğan, E., Arık, Mehmet

Basım Tarihi 2018

Basım Yeri - SPIE

Konu Light-emitting diode efficiency, Light-emitting diode optics, Remote phosphor coating, Liquid cooling

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 0091-3286

Kayıt Numarası 2a57e831-8565-49ad-9067-d17d79dbfe6f

Lokasyon Mechanical Engineering

Tarih 2018

Örnek Metin The inclusion of phosphor into a high brightness light-emitting diode (LED) package is a complicated task since LEDs are encapsulated with a phosphor and epoxy mixture to convert blue photons to white light. Moreover, this common practice may cause high temperatures and fractures in the gold wire bonds of the chip or solder balls due to local heating and thermal stresses leading to device failures. Furthermore, at elevated junction temperatures, the light conversion efficiency of the phosphor reduces and decreases the overall optical efficiency of an LED. Although, remote phosphor technique has been already applied to LED systems, the high power requirements have needed better performing methods. Thus, an immersion liquid cooled remote phosphor-coated system has been proposed and experimentally and computationally investigated. First, a set of experiments was performed, which includes the combined effects coming from both optical and thermal improvements with the proposed liquid cooled remote phosphor-coated technique, where the total light extraction enhancement was obtained in excess of 25%. Then, the same problem has been computationally studied for investigation of solely optical enhancements, which has shown that remote phosphor-coated LED package with a liquid coolant of suitable refractive index at the optical path has enhanced the overall lumen performance about 13%, whereas the rest of the improvements of 12% were due to thermal enhancements.

DOI 10.1117/1.OE.57.5.055101

Cilt 57