GdAG:Ce fluorescent ceramic formed by aqueous tape casting and isostatic pressing process for WLED applications

• Published in: Applied physics. A, Materials science & processing Vol. 129; no. 5
• Main Authors: Ji, Changyan, Su, Huijuan, Huang, Zhi, Tian, Xiuying, Zeng, Ting, He, Hengping, Xu, Junna, Wen, Jin, Peng, Yangxi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2023; Springer Nature B.V
• Subjects: Applied physics; Casting; Ceramics; Characterization and Evaluation of Materials; Condensed Matter Physics; Crystal structure; Fluorescence; Gadolinium; High temperature; Isostatic pressing; Light emitting diodes; Machines; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Photoluminescence; Physics; Physics and Astronomy; Processes; Surfaces and Interfaces; Tape casting; Thermal stability; Thin Films; White light; Yttrium-aluminum garnet; WLED; Aqueous tape casting; Fluorescent ceramic; Isostatic pressing
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-023-06659-1

The fluorescent ceramic GdAG:Ce was formed by aqueous tape casting-isostatic pressing process and synthesized by high temperature solid state method. To investigate the effect of introduction of Gd 3+ on the crystal structure, the photoluminescence (PL) properties, decay lifetime and the white light-emitting diodes (WLED) applications, non-Gd 3+ analogue sample YAG:Ce was prepared as well. In contrast, fluorescent ceramic GdAG:Ce exhibited a relatively smaller XRD peaks, much stronger PL emission intensity and shorter lifetime than that of YAG:Ce. These findings could be beneficial to the improvement of the WLED performance. Moreover, fluorescent ceramic GdAG:Ce was made up of practical with garnet structure, which possessed good thermal stability. As a consequence, an increase of color rendering index ( R a ) to 62.3 and decrease of correlated temperature (CCT) to 3208 K was achieved by the WLED device based on fluorescent ceramic GdAG:Ce. The impressive results provided a basis for the fluorescent ceramic used in the field of WLED with high R a and low CCT.