Ce:YScAG phosphor-converted transparent ceramics with high thermal saturation and weak concentration quenching for LED and LD white lighting. Issue 2 (15th January 2023)

• Record Type: Journal Article
• Authors: Li, Yukun; Luo, Zhaohua; Liu, Yongfu; Liu, Zehua; Hanson, Svenja; Lin, Hui; Hu, Pan; Sun, Peng; Jiang, Jun
• Is Part Of: Ceramics international. Volume 49:Issue 2(2023)
• Page Start: 2051
• Page End: 2060
• Publication Date: 2023-01-15
• Subjects: Transparent ceramics -- Laser lighting -- Thermal stability -- Doping concentration -- Ce:YScAG; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.09.171
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In the high-power white light LEDs/LDs area, obtaining phosphor-converted materials with high thermal stability and high luminous emittance with proper blue/yellow light ratio has been the main challenge in recent years. In this study, a group of (Cex Y1-x )3 (Scy Al1-y )5 O12 transparent ceramics with high optical quality were proposed to rise to that challenge. Their spectra were regulated by incorporating Sc 3+, showing blue shifted emission bands (peak position from 554 nm–538 nm), blue shifted excitation bands (462–445 nm) and narrowed full width at half maxima (120–112 nm). Significantly, the prepared Ce:YScAG transparent ceramics (TC) exhibited decent thermal quenching performance with the photoluminescence intensity at 150 °C maintaining 88.7% of its original value at room temperature. The Sc incorporation impacted the atoms' occupation and distance, crystal field splitting and energy band structure. Under remote LD excitation mode, the luminous efficiency of the prepared Ce:YScAG TC can achieve 164.8 lm/W. And even if the Ce 3+ doping reaches 2.0 at%, the LE can still maintain 117.8 lm/W, exhibiting decent concentration quenching characteristic. Consequently, Ce:YScAG TCs have great potential as promising phosphor-converted materials in future high-power LED and LD white lighting.