Synthesis and luminescent properties of Tb{sup 3+}-activated yttrium indium germanate phosphor
- Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan (China)
- Department of Resources Engineering, Dahan Institute of Technology, Hualien 971, Taiwan (China)
- Department of Electronic Engineering, Kao Yuan University Lujhu, Kaohsiung 821, Taiwan (China)
An yttrium indium germanate YInGe{sub 2}O{sub 7} and YInGe{sub 2}O{sub 7}:Tb{sup 3+} was synthesized using a vibrating milled solid-state reaction with metal oxides. The structure was characterized by its X-ray powder diffraction pattern. All of the peaks can be attributed to the monoclinic YInGe{sub 2}O{sub 7} phase, as increasing the Tb{sup 3+} ion concentrations and the full-width of the half-maximum (fwhm) of these peaks did not cause any obvious differences in the increase in Tb{sup 3+} concentration. The CIE color coordinates were all in the green region. The phosphor exhibited a bright green emission at 542 nm under excitation at 378 and 258 nm, which belongs to the {sup 5}D{sub 4}{yields}{sup 7}F{sub 5} transition of Tb{sup 3+} ions. There were two kinds of emission mechanism in YInGe{sub 2}O{sub 7}:Tb{sup 3+}: (1) under excitation at 378 nm, time-resolved {sup 5}D{sub 4}{yields}{sup 7}F{sub 5} transition shows a single exponential decay even when all sites are occupied by Tb{sup 3+} ions; (2) under excitation at 258 nm, the excited energy was absorbed by the host crystal then transferred effectively to the Tb{sup 3+} ion which caused the decay curves for the {sup 5}D{sub 4}{yields}{sup 7}F{sub 5} transition to show non-exponential behavior. There is a maximum value for photoluminescence intensity when the Tb{sup 3+} concentration is 100 mol% with CIE color coordinates of x=0.252; y=0.595. The concentration quenching effect was not observed, because the YInGe{sub 2}O{sub 7}:Tb{sup 3+} structure gradually changed to a thortveitite-like structure with increasing Tb{sup 3+} concentration.
- OSTI ID:
- 21043728
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 11; Other Information: DOI: 10.1016/j.jssc.2007.07.018; PII: S0022-4596(07)00272-1; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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