TY - JOUR
T1 - Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications
AU - Lee, In Jae
AU - Kim, Young Gyun
AU - Elayappan, Vijayakumar
AU - Kim, Jimin
AU - Kim, Kihyun
AU - Noh, Hyun Sung
AU - Lee, Haigun
N1 - Funding Information:
This work was supported by the Industrial Strategic Technology Development program funded by the Ministry of Trade Industry & Energy, Korea (Project No. 10047778).
Funding Information:
This work was supported by the Industrial Strategic Technology Development program funded by the Ministry of Trade Industry & Energy, Korea (Project No. 10047778 ).
Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.
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.
KW - Automotive headlamp
KW - High-power LED
KW - Luminous efficiency
KW - PiG plates
KW - Post-annealing
UR - http://www.scopus.com/inward/record.url?scp=85073022460&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.10.013
DO - 10.1016/j.ceramint.2019.10.013
M3 - Article
AN - SCOPUS:85073022460
SN - 0272-8842
VL - 46
SP - 3113
EP - 3118
JO - Ceramics International
JF - Ceramics International
IS - 3
ER -
