Author(s): He, XW (He, Xiaowu); Ren, YB (Ren, Yanbiao); Hu, CX (Hu, Caixia); Ma, B (Ma, Ben); Chen, H (Chen, Hao); Huang, SS (Huang, Shushan); Hao, HY (Hao, Hongyue); Qi, TT (Qi, Tongtong); Liu, XF (Liu, Xiaofang); Yu, RH (Yu, Ronghai)
Source: JOURNAL OF ALLOYS AND COMPOUNDS Volume: 822 Article Number: 153671 DOI: 10.1016/j.jallcom.2020.153671 Published: MAY 5 2020
Abstract: A modified sol-gel method was applied in producing Ce3+- and Eu3+- codoped yttrium aluminum garnet (YAG:Ce,Eu) phosphors. Multiple related techniques were utilized to examine the minute correlation between fine structure and photoluminescence (PL) in Ce3+,Eu3+- codoped YAG phosphors in detail. It shows that the Ce3+ or Eu3+ replacement of Y3+ can slightly enlarge the YAG lattice and cause the fine variation of local crystal structure. Ce3+,Eu3+- codoped YAG phosphors exhibit several sharp and narrow D-5(0) -> F-7(J) (J = 0 - 4) red emissions of Eu3+ and broad 5d(1) -> 4f (F-2(5/2), F-2(7/2)) yellow emissions of Ce3+. The PL intensity of Ce3+,Eu3+- codoped YAG phosphors increases with calcination temperature, while dramatically decreases with increasing the Eu3+-doped concentration from 0.11 to 4.40 at.%. Additionally, the geometrical distortion surrounding Ce3+ introduced by incorporated Eu3+ results in the variation of crystal field. It causes red shift of the PL emission band of YAG:Ce,Eu phosphors. (C) 2020 Published by Elsevier B.V.
Accession Number: WOS:000512377800013
ISSN: 0925-8388
eISSN: 1873-4669
Full Test: https://www.sciencedirect.com/science/article/pii/S0925838820300347?via%3Dihub