Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

• Published in: Journal of advanced ceramics 2021-10, Vol.10 (5), p.1107-1118
• Main Authors: Zhou, Tianyuan, Hou, Chen, Zhang, Le, Ma, Yuelong, Kang, Jian, Li, Tao, Wang, Rui, Huang, Jin, Li, Junwei, Ren, Haidong, Fu, Zhenxiao, Selim, Farida A., Li, Ming, Chen, Hao
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Color; Composites; Converters; Energy; Excitation; Excitation spectra; Glass; Heat conductivity; Laboratories; Lasers; Light emitting diodes; Lighting; Luminescence; Materials Science; Nanotechnology; Natural Materials; Optical properties; Photoluminescence; Rendering; Research Article; Structural Materials; Thermal stability; Yttrium-aluminum garnet
• ISSN: 2226-4108; 2227-8508
• DOI: 10.1007/s40145-021-0496-8

Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr 3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.