Polarization selection rules and optical transitions in terbium activated yttrium tantalate phosphor under x-ray, vacuum-ultraviolet, and ultraviolet excitations
The terbium-activated yttrium tantalite (YTaO4:Tb{sup 3{sup +}}) phosphor is of great interest due to the interesting spectroscopic properties of rare earth ions in crystals and also practical use in x-ray imaging. Using the group-theoretical approach, we analyze the selection rules for the transition between Stark components of Tb{sup 3{sup +}} in symmetry of the actual crystal field and the polarization for the allowed transitions. The luminescence upon UV, vacuum-ultraviolet (VUV), and x-ray excitation is presented and discussed. The YTaO4:Tb{sup 3{sup +}} phosphors are found to be efficient VUV-excited luminescent materials that could be used not only in x-ray intensifying screens, but also in mercury-free fluorescent lamps or plasma display panels.
- OSTI ID:
- 21175827
- Journal Information:
- Applied Optics, Journal Name: Applied Optics Journal Issue: 1 Vol. 48; ISSN 0003-6935; ISSN APOPAI
- Country of Publication:
- United States
- Language:
- English
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