Jump to main content
Jump to site search


High quantum efficiency Ce:(Lu,Y)3(Al,Sc)2Al3O12 transparent ceramics with excellent thermal stability for high-power white LEDs/LDs

Abstract

Transparent ceramics (TCs) with high quantum efficiency and excellent thermal stability are essential for the applications in high-power remote excitation white light-emitting diode or laser diode (LED/LD) lighting devices as color convertors. In this study, based on the "local complexity of Ce3+ ion coordination environment effect" and "effective ionic radius match effect", an effecitve regulation of phase composition and spectral property was realized in LuAG TCs by incorporating Y3+ and Sc3+ ions. A series of Ce:(Lu,Y)3(Al,Sc)2Al3O12 (Ce:LuYSAG) TCs were fabricated with a high internal quantum efficiency (IQE) of 86.7%. The prepared TCs exhibited a distinct red-shift (520→541 nm) and a 10.2% increase of full width at half maximum (FWHM) in emission spectra. Surprisingly, a 89.9% of the room temperature emission intensity of the TC was retained at 200 °C. By combining the Ce:LuYSAG TCs with a 460 nm blue chip or a 455 nm laser source, white LED/LD devices in a remote excitation mode were constructed. A tunable hue from cyan-green to pale-green was obtained with increasing Y3+ concentration of TCs. The surface temperature of TCs was varied from 112.6 °C to 62 °C under 1.0 W LD excitation. As increasing the power of the blue laser from 1.0 W to 3.5 W, the luminous flux (LF) of the TC with 30 at.% Sc3+ and 50 at.% Y3+ ions substitution was tremendously increased from 250.9 lm to 877.4 lm, and the optimized luminous efficiency of radiation (LER) was as high as 251 lm/W. Therefore, this work opens up new opportunities for the development of TCs with excellent luminescence performance thourgh manipulating their local coordination structure for high-power white LEDs/LDs.

Back to tab navigation

Supplementary files

Article information


Submitted
04 Sep 2020
Accepted
12 Oct 2020
First published
12 Oct 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

High quantum efficiency Ce:(Lu,Y)3(Al,Sc)2Al3O12 transparent ceramics with excellent thermal stability for high-power white LEDs/LDs

Y. Ma, L. Zhang, T. Zhou, C. Hou, J. Kang, S. Yang, X. Xi, M. Yuan, J. Huang, R. Wang, F. A. Selim, M. Li, Y. Wang and H. Chen, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC04231E

Social activity

Search articles by author

Spotlight

Advertisements