Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403720 | Journal of Luminescence | 2007 | 5 Pages |
Abstract
The excitation spectra of M (M=Si4+, Ti4+) and Eu3+ co-doped BaZr(BO3)2, BaZrO3:Eu and La2Zr2O7:Eu in the vacuum ultraviolet (VUV) regions of 110-300Â nm are investigated and the host-lattice absorption are characterized. The result indicated that BaZr(BO3)2:Eu3+ phosphor has a strong absorption under the VUV excitation, and in the host-lattice excitation, the strong band at 130-160Â nm could be due to the BO3 atomic groups; the band at 160-180Â nm is related to the excitation of Ba-O; 180-200Â nm corresponds to the charge transfer (CT) transition of Zr-O. The band at 200-235Â nm due to the CT band of Eu3+-O2â and a bond valence study explained the observed weak CT band of Eu3+-O2â in the excitation spectra of BaZr(BO3)2:Eu3+. The emission results show that Si4+ can sensitize luminescence in the host of BaZr(BO3)2:Eu but Ti4+ has no improvement effect on luminescence.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Ling He, Yuhua Wang, Hui Gao,