Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes

Gyu Hyeong Bak; Sun Woo Oh; Hyun Ho Sung; Suk Bum Yoon; Won Jung Kim; Hwan Hee Jeong; June O. Song; Tae Yeon Seong

doi:10.1149/08507.0067ecst

Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes

Gyu Hyeong Bak, Sun Woo Oh, Hyun Ho Sung, Suk Bum Yoon, Won Jung Kim, Hwan Hee Jeong, June O. Song, Tae Yeon Seong

Department of Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

The optical and thermal properties of the CSP LEDs were investigated as function of the phosphor film thickness and width. Eight different types of phosphor-converted white CSP LEDs were prepared by using mixed multicolor phosphors. It was shown that with increasing phosphor film thickness, the luminous flux and the radiation angle increased. On the other hand, as the CSP area increased, the radiation angle decreased. This behavior was attributed to the fact that the blue light of the LED did not excite the whole area of the phosphor. At high current, the junction temperature increased with increasing phosphor film thickness and the thickest phosphor sample showed the highest junction temperature. The results demonstrate a simple method of optimizing the phosphor layer thickness and width for the fabrication of high-performance white LEDs for a white light source.

Original language	English
Title of host publication	ECS Transactions
Editors	J. Hite, V. Chakrapani, J. Zavada, T. J. Anderson, S. Kilgore
Publisher	Electrochemical Society Inc.
Pages	67-72
Number of pages	6
Edition	7
ISBN (Electronic)	9781607688358
ISBN (Print)	9781607688358
DOIs	https://doi.org/10.1149/08507.0067ecst
Publication status	Published - 2018
Event	Symposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting - Seattle, United States Duration: 2018 May 13 → 2018 May 17

Publication series

Name	ECS Transactions
Number	7
Volume	85
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Other

Other	Symposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting
Country/Territory	United States
City	Seattle
Period	18/5/13 → 18/5/17

ASJC Scopus subject areas

Engineering(all)

Access to Document

10.1149/08507.0067ecst

Cite this

Bak, G. H., Oh, S. W., Ho Sung, H., Yoon, S. B., Kim, W. J., Jeong, H. H., Song, J. O., & Seong, T. Y. (2018). Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes. In J. Hite, V. Chakrapani, J. Zavada, T. J. Anderson, & S. Kilgore (Eds.), ECS Transactions (7 ed., pp. 67-72). (ECS Transactions; Vol. 85, No. 7). Electrochemical Society Inc.. https://doi.org/10.1149/08507.0067ecst

Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes. / Bak, Gyu Hyeong; Oh, Sun Woo; Ho Sung, Hyun et al.
ECS Transactions. ed. / J. Hite; V. Chakrapani; J. Zavada; T. J. Anderson; S. Kilgore. 7. ed. Electrochemical Society Inc., 2018. p. 67-72 (ECS Transactions; Vol. 85, No. 7).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Bak, GH, Oh, SW, Ho Sung, H, Yoon, SB, Kim, WJ, Jeong, HH, Song, JO & Seong, TY 2018, Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes. in J Hite, V Chakrapani, J Zavada, TJ Anderson & S Kilgore (eds), ECS Transactions. 7 edn, ECS Transactions, no. 7, vol. 85, Electrochemical Society Inc., pp. 67-72, Symposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting, Seattle, United States, 18/5/13. https://doi.org/10.1149/08507.0067ecst

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title = "Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes",

abstract = "The optical and thermal properties of the CSP LEDs were investigated as function of the phosphor film thickness and width. Eight different types of phosphor-converted white CSP LEDs were prepared by using mixed multicolor phosphors. It was shown that with increasing phosphor film thickness, the luminous flux and the radiation angle increased. On the other hand, as the CSP area increased, the radiation angle decreased. This behavior was attributed to the fact that the blue light of the LED did not excite the whole area of the phosphor. At high current, the junction temperature increased with increasing phosphor film thickness and the thickest phosphor sample showed the highest junction temperature. The results demonstrate a simple method of optimizing the phosphor layer thickness and width for the fabrication of high-performance white LEDs for a white light source.",

author = "Bak, {Gyu Hyeong} and Oh, {Sun Woo} and {Ho Sung}, Hyun and Yoon, {Suk Bum} and Kim, {Won Jung} and Jeong, {Hwan Hee} and Song, {June O.} and Seong, {Tae Yeon}",

note = "Funding Information: This work was supported by LG Innotek Co., Ltd. and the Global Research Laboratory (GRL) program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (NRF-2017K1A1A2013160).; Symposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting ; Conference date: 13-05-2018 Through 17-05-2018",

year = "2018",

doi = "10.1149/08507.0067ecst",

language = "English",

isbn = "9781607688358",

series = "ECS Transactions",

publisher = "Electrochemical Society Inc.",

number = "7",

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T1 - Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes

AU - Bak, Gyu Hyeong

AU - Oh, Sun Woo

AU - Ho Sung, Hyun

AU - Yoon, Suk Bum

AU - Kim, Won Jung

AU - Jeong, Hwan Hee

AU - Song, June O.

AU - Seong, Tae Yeon

N1 - Funding Information: This work was supported by LG Innotek Co., Ltd. and the Global Research Laboratory (GRL) program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and Future Planning (NRF-2017K1A1A2013160).

PY - 2018

Y1 - 2018

N2 - The optical and thermal properties of the CSP LEDs were investigated as function of the phosphor film thickness and width. Eight different types of phosphor-converted white CSP LEDs were prepared by using mixed multicolor phosphors. It was shown that with increasing phosphor film thickness, the luminous flux and the radiation angle increased. On the other hand, as the CSP area increased, the radiation angle decreased. This behavior was attributed to the fact that the blue light of the LED did not excite the whole area of the phosphor. At high current, the junction temperature increased with increasing phosphor film thickness and the thickest phosphor sample showed the highest junction temperature. The results demonstrate a simple method of optimizing the phosphor layer thickness and width for the fabrication of high-performance white LEDs for a white light source.

AB - The optical and thermal properties of the CSP LEDs were investigated as function of the phosphor film thickness and width. Eight different types of phosphor-converted white CSP LEDs were prepared by using mixed multicolor phosphors. It was shown that with increasing phosphor film thickness, the luminous flux and the radiation angle increased. On the other hand, as the CSP area increased, the radiation angle decreased. This behavior was attributed to the fact that the blue light of the LED did not excite the whole area of the phosphor. At high current, the junction temperature increased with increasing phosphor film thickness and the thickest phosphor sample showed the highest junction temperature. The results demonstrate a simple method of optimizing the phosphor layer thickness and width for the fabrication of high-performance white LEDs for a white light source.

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T3 - ECS Transactions

SP - 67

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BT - ECS Transactions

A2 - Hite, J.

A2 - Chakrapani, V.

A2 - Zavada, J.

A2 - Anderson, T. J.

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PB - Electrochemical Society Inc.

T2 - Symposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting

Y2 - 13 May 2018 through 17 May 2018

ER -

Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes

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