Improved angular color uniformity and hydrothermal reliability of phosphor-converted white light-emitting diodes by using phosphor sedimentation

Won Jung Kim; Taek Kyun Kim; Sung Ho Kim; Suk Bum Yoon; Hwan Hee Jeong; June O. Song; Tae Yeon Seong

doi:10.1364/OE.26.028634

Improved angular color uniformity and hydrothermal reliability of phosphor-converted white light-emitting diodes by using phosphor sedimentation

Won Jung Kim, Taek Kyun Kim, Sung Ho Kim, Suk Bum Yoon, Hwan Hee Jeong, June O. Song, Tae Yeon Seong

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We investigated the effect of phosphor deposition methods on the correlated color temperature (CCT), luminous flux and thermal characteristics of packaged white light-emitting diodes (WLEDs) for use in mobile display products. For both the samples, the CCT decreased with increasing viewing angle. Phosphor sedimentation samples displayed much better angular color uniformity than phosphor dispersion samples. The phosphor sedimentation sample had higher luminous flux and luminous efficacy at 20 mA than the phosphor dispersion sample. The phosphor sedimentation sample displayed much better high-temperature/humidity (85 °C/85%) reliability and lower package temperatures compared with the phosphor dispersion sample.

Original language	English
Pages (from-to)	28634-28640
Number of pages	7
Journal	Optics Express
Volume	26
Issue number	22
DOIs	https://doi.org/10.1364/OE.26.028634
Publication status	Published - 2018 Oct 29

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OE.26.028634

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title = "Improved angular color uniformity and hydrothermal reliability of phosphor-converted white light-emitting diodes by using phosphor sedimentation",

abstract = "We investigated the effect of phosphor deposition methods on the correlated color temperature (CCT), luminous flux and thermal characteristics of packaged white light-emitting diodes (WLEDs) for use in mobile display products. For both the samples, the CCT decreased with increasing viewing angle. Phosphor sedimentation samples displayed much better angular color uniformity than phosphor dispersion samples. The phosphor sedimentation sample had higher luminous flux and luminous efficacy at 20 mA than the phosphor dispersion sample. The phosphor sedimentation sample displayed much better high-temperature/humidity (85 °C/85%) reliability and lower package temperatures compared with the phosphor dispersion sample.",

author = "Kim, {Won Jung} and Kim, {Taek Kyun} and Kim, {Sung Ho} and Yoon, {Suk Bum} and Jeong, {Hwan Hee} and Song, {June O.} and Seong, {Tae Yeon}",

note = "Funding Information: LG Innotek Co., Ltd.; Global Research Laboratory program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF-2017K1A1A2013160). Publisher Copyright: {\textcopyright} 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement",

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T1 - Improved angular color uniformity and hydrothermal reliability of phosphor-converted white light-emitting diodes by using phosphor sedimentation

AU - Kim, Won Jung

AU - Kim, Taek Kyun

AU - Kim, Sung Ho

AU - Yoon, Suk Bum

AU - Jeong, Hwan Hee

AU - Song, June O.

AU - Seong, Tae Yeon

N1 - Funding Information: LG Innotek Co., Ltd.; Global Research Laboratory program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF-2017K1A1A2013160). Publisher Copyright: © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

PY - 2018/10/29

Y1 - 2018/10/29

N2 - We investigated the effect of phosphor deposition methods on the correlated color temperature (CCT), luminous flux and thermal characteristics of packaged white light-emitting diodes (WLEDs) for use in mobile display products. For both the samples, the CCT decreased with increasing viewing angle. Phosphor sedimentation samples displayed much better angular color uniformity than phosphor dispersion samples. The phosphor sedimentation sample had higher luminous flux and luminous efficacy at 20 mA than the phosphor dispersion sample. The phosphor sedimentation sample displayed much better high-temperature/humidity (85 °C/85%) reliability and lower package temperatures compared with the phosphor dispersion sample.

AB - We investigated the effect of phosphor deposition methods on the correlated color temperature (CCT), luminous flux and thermal characteristics of packaged white light-emitting diodes (WLEDs) for use in mobile display products. For both the samples, the CCT decreased with increasing viewing angle. Phosphor sedimentation samples displayed much better angular color uniformity than phosphor dispersion samples. The phosphor sedimentation sample had higher luminous flux and luminous efficacy at 20 mA than the phosphor dispersion sample. The phosphor sedimentation sample displayed much better high-temperature/humidity (85 °C/85%) reliability and lower package temperatures compared with the phosphor dispersion sample.

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Improved angular color uniformity and hydrothermal reliability of phosphor-converted white light-emitting diodes by using phosphor sedimentation

Abstract

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