Elevating photoluminescence properties of Y3MgAl3SiO12:Ce3+transparent ceramics for high-power white lighting

Compared with Y3Al5O12:Ce3+, Y3MgAl3SiO12:Ce3+ (YMASG:Ce3+) reveals great potential for high -power white lighting with red-shift spectrum. Herein, YMASG:Ce3+ transparent ceramics were explored to be synthesized in the air following hot isostatic pressure (HIP) treatment to obtain tunable and optimized optical properties. Then phase purity, microstructure, transmittance, and photo-luminescence of YMASG:Ce3+ ceramics were investigated. The emission peak of YMASG:Ce3+ trans-parent ceramic can be tuned from 573 to 592 nm with the variation of Ce3+ doping concentration. It should be noted that this YMASG:0.2 at%Ce3+ transparent ceramic with emission peak at 579 nm under 450 nm excitation exhibits the highest internal/external quantum efficiency (72%/65%). The white LED device using YMASG:0.2 at%Ce3+ transparent ceramic with a 0.4 mm thickness demon-strates a luminous efficiency (LE) of 106 lm/W, correlated color temperature of 3158 K, and color coordinate (0.3933, 0.3265). Thermal stability can be significantly improved by the incorporation of Lu3+ in YMASG transparent ceramic, and the Y3-yLuyMgAl3SiO12:0.2 at%Ce3+ (y = 0-2.5) transparent ceramics were fabricated. The highest thermal stability (88%@150 degrees C of the integrated emission in-tensity at 25 degrees C) can be achieved when y = 2.5. The maximum LE of 154 lm/W can be obtained from Y0.5Lu2.5MgAl3SiO12:0.2 at%Ce3+ transparent ceramic. These results indicate that YMASG:Ce3+ trans-parent ceramics with optimized properties can be regarded as an encouraging candidate for high -power white lighting.(c) 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.