Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications

In Jae Lee; Young Gyun Kim; Vijayakumar Elayappan; Jimin Kim; Kihyun Kim; Hyun Sung Noh; Haigun Lee

doi:10.1016/j.ceramint.2019.10.013

Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications

In Jae Lee, Young Gyun Kim, Vijayakumar Elayappan, Jimin Kim, Kihyun Kim, Hyun Sung Noh, Haigun Lee

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

11 Citations (Scopus)

Abstract

Currently, phosphor-converted white light-emitting diodes offer low energy consumption, good environmental stability, and a long lifetime. Hence, they are widely utilized in high-power light-emitting diode (LED) applications such as those in the automotive headlamp industries. However, obtaining high luminous efficiency of such diodes is challenging because of their internal structural properties such as micropores. Herein, we developed phosphor-in-glass (PiG) plates by mixing a blue LED chip and yellow phosphor to create high-power white LEDs (w-LEDs). In addition, the influence of post-annealing on the prepared PiG plates at different temperatures (350°C-550 °C) was investigated. Post-annealing, a treatment that facilitates the mobility of the ceramic matrix encapsulating the phosphor powder, decreases an LED's porosity, thereby enhancing its overall luminous efficiency. Results show that PiG plates post-annealed at 450 °C exhibit superior optical performance and effective color properties than PiG plates that were non-annealed or post-annealed at 350 °C, 400 °C, 500 °C, and 550 °C. Therefore, post-annealed PiG plates are more suitable potential materials for application in the high-power LED industry.

Original language	English
Pages (from-to)	3113-3118
Number of pages	6
Journal	Ceramics International
Volume	46
Issue number	3
DOIs	https://doi.org/10.1016/j.ceramint.2019.10.013
Publication status	Published - 2020 Feb 15

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.

Keywords

Automotive headlamp
High-power LED
Luminous efficiency
PiG plates
Post-annealing

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ceramint.2019.10.013

Cite this

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title = "Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications",

abstract = "Currently, phosphor-converted white light-emitting diodes offer low energy consumption, good environmental stability, and a long lifetime. Hence, they are widely utilized in high-power light-emitting diode (LED) applications such as those in the automotive headlamp industries. However, obtaining high luminous efficiency of such diodes is challenging because of their internal structural properties such as micropores. Herein, we developed phosphor-in-glass (PiG) plates by mixing a blue LED chip and yellow phosphor to create high-power white LEDs (w-LEDs). In addition, the influence of post-annealing on the prepared PiG plates at different temperatures (350°C-550 °C) was investigated. Post-annealing, a treatment that facilitates the mobility of the ceramic matrix encapsulating the phosphor powder, decreases an LED's porosity, thereby enhancing its overall luminous efficiency. Results show that PiG plates post-annealed at 450 °C exhibit superior optical performance and effective color properties than PiG plates that were non-annealed or post-annealed at 350 °C, 400 °C, 500 °C, and 550 °C. Therefore, post-annealed PiG plates are more suitable potential materials for application in the high-power LED industry.",

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author = "Lee, {In Jae} and Kim, {Young Gyun} and Vijayakumar Elayappan and Jimin Kim and Kihyun Kim and Noh, {Hyun Sung} and Haigun Lee",

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AU - Kim, Young Gyun

AU - Elayappan, Vijayakumar

AU - Kim, Jimin

AU - Kim, Kihyun

AU - Noh, Hyun Sung

AU - Lee, Haigun

PY - 2020/2/15

Y1 - 2020/2/15

N2 - Currently, phosphor-converted white light-emitting diodes offer low energy consumption, good environmental stability, and a long lifetime. Hence, they are widely utilized in high-power light-emitting diode (LED) applications such as those in the automotive headlamp industries. However, obtaining high luminous efficiency of such diodes is challenging because of their internal structural properties such as micropores. Herein, we developed phosphor-in-glass (PiG) plates by mixing a blue LED chip and yellow phosphor to create high-power white LEDs (w-LEDs). In addition, the influence of post-annealing on the prepared PiG plates at different temperatures (350°C-550 °C) was investigated. Post-annealing, a treatment that facilitates the mobility of the ceramic matrix encapsulating the phosphor powder, decreases an LED's porosity, thereby enhancing its overall luminous efficiency. Results show that PiG plates post-annealed at 450 °C exhibit superior optical performance and effective color properties than PiG plates that were non-annealed or post-annealed at 350 °C, 400 °C, 500 °C, and 550 °C. Therefore, post-annealed PiG plates are more suitable potential materials for application in the high-power LED industry.

AB - Currently, phosphor-converted white light-emitting diodes offer low energy consumption, good environmental stability, and a long lifetime. Hence, they are widely utilized in high-power light-emitting diode (LED) applications such as those in the automotive headlamp industries. However, obtaining high luminous efficiency of such diodes is challenging because of their internal structural properties such as micropores. Herein, we developed phosphor-in-glass (PiG) plates by mixing a blue LED chip and yellow phosphor to create high-power white LEDs (w-LEDs). In addition, the influence of post-annealing on the prepared PiG plates at different temperatures (350°C-550 °C) was investigated. Post-annealing, a treatment that facilitates the mobility of the ceramic matrix encapsulating the phosphor powder, decreases an LED's porosity, thereby enhancing its overall luminous efficiency. Results show that PiG plates post-annealed at 450 °C exhibit superior optical performance and effective color properties than PiG plates that were non-annealed or post-annealed at 350 °C, 400 °C, 500 °C, and 550 °C. Therefore, post-annealed PiG plates are more suitable potential materials for application in the high-power LED industry.

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Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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