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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publicationECS Transactions
PublisherElectrochemical Society Inc.
Pages67-72
Number of pages6
Volume85
Edition7
ISBN (Electronic)9781607685395
Publication statusPublished - 2018 Jan 1
EventSymposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting - Seattle, United States
Duration: 2018 May 132018 May 17

Other

OtherSymposium on Wide Bandgap Semiconductor Materials and Devices 19 - 233rd ECS Meeting
CountryUnited States
CitySeattle
Period18/5/1318/5/17

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Phosphors
Light emitting diodes
Thermodynamic properties
Optical properties
Film thickness
Radiation
Light sources
Fluxes
Fabrication
Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Bak, G. H., Oh, S. W., Ho Sung, H., Yoon, S. B., Kim, W. J., Jeong, H. H., ... Seong, T. Y. (2018). Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes. In ECS Transactions (7 ed., Vol. 85, pp. 67-72). Electrochemical Society Inc..

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; Yoon, Suk Bum; Kim, Won Jung; Jeong, Hwan Hee; Song, June O.; Seong, Tae Yeon.

ECS Transactions. Vol. 85 7. ed. Electrochemical Society Inc., 2018. p. 67-72.

Research output: Chapter in Book/Report/Conference proceedingConference 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 ECS Transactions. 7 edn, 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.
Bak GH, Oh SW, Ho Sung H, Yoon SB, Kim WJ, Jeong HH et al. Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes. In ECS Transactions. 7 ed. Vol. 85. Electrochemical Society Inc. 2018. p. 67-72
Bak, Gyu Hyeong ; Oh, Sun Woo ; Ho Sung, Hyun ; Yoon, Suk Bum ; Kim, Won Jung ; Jeong, Hwan Hee ; Song, June O. ; Seong, Tae Yeon. / Effect of phosphor layer size on the optical and thermal properties of chip scale packaged light-emitting diodes. ECS Transactions. Vol. 85 7. ed. Electrochemical Society Inc., 2018. pp. 67-72
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