Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403716 | Journal of Luminescence | 2007 | 5 Pages |
Abstract
The luminescent properties of CaYBO4:Ln(Ln=Eu3+, Tb3+) were investigated under ultraviolet (UV) and vacuum ultraviolet (VUV) region. The CT band of Eu3+ at about 245Â nm blue-shifted to 230Â nm in VUV excitation spectrum; the band with the maximum at 183Â nm was considered as the host lattice absorption. For the sample of CaYBO4:0.08Tb3+, the bands at about 235 and 263Â nm were assigned to the f-d transitions of Tb3+ and the CT band of Tb3+ was calculated according to JÏrgensen's theory. Under UV and VUV excitation, the main emission of Eu3+ corresponding to the 5D0-7F2 transition located at about 610Â nm and two intense emission of Tb3+ from the 5D4-7F5 transition had been observed at about 542 and 552Â nm, respectively. With the incorporation of Gd3+ into the host lattice of CaYBO4, the luminescence of Tb3+ was enhanced while that of Eu3+ was decreased because of their different excitation mechanism.
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Authors
Lingli Wang, Yuhua Wang,