Issue 17, 2024

Ce:(Lu,Sr)3(Al,Si)5O12 transparent ceramics for high-power white LEDs/LDs with ultra-high luminance saturation threshold

Abstract

As a new generation solid state lighting source, high-power phosphor-converted white light-emitting diode or laser diode (LED/LD) lighting has drawn much attention. However, under the excitation of a high power density laser, the high temperature induced performance degradation of thermal stability and color quality for green conversion materials becomes the major challenge. In this work, heavy atom Sr2+ and highly charged Si4+ were used to substitute Lu3+ and Al3+, displaying the effect of lattice relaxation depression. The remarkable 98% emission intensity of TCs was retained at 150 °C, and the abnormal thermal quenching phenomenon was discovered. The optimized TC-based LD devices exhibited an ultra-high luminance saturation threshold of 65 W mm−2, and the ceramic surface temperature was dramatically reduced to 114.4 °C at ∼50 W mm−2. More importantly, the luminous efficiency of radiation (LER) was also maintained to be as high as 261.98 lm W−1. Ce:LSASG TCs showed excellent thermal quenching behavior and the highest saturation threshold. This result provides a new path to design innovative photoelectric materials with favorable thermal stability for high power devices.

Graphical abstract: Ce:(Lu,Sr)3(Al,Si)5O12 transparent ceramics for high-power white LEDs/LDs with ultra-high luminance saturation threshold

Supplementary files

Article information

Article type
Paper
Submitted
18 Feb 2024
Accepted
25 Mar 2024
First published
03 Apr 2024

J. Mater. Chem. C, 2024,12, 6046-6055

Ce:(Lu,Sr)3(Al,Si)5O12 transparent ceramics for high-power white LEDs/LDs with ultra-high luminance saturation threshold

X. Zhang, P. Sang, C. Wei, S. Lin, J. Kang, Y. Li, B. Sun, Y. Li, F. A. Selim, C. Zhou, T. Zhou, S. Chen, C. Shi, W. Stręk, H. Chen and L. Zhang, J. Mater. Chem. C, 2024, 12, 6046 DOI: 10.1039/D4TC00648H

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