Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403355 | Journal of Luminescence | 2007 | 6 Pages |
Abstract
Yttrium aluminum garnet (YAG) particles doped with Tb3+ or double doped with Tb3+ and Ce3+ were prepared by spray pyrolysis and characterized by photo- and cathode-luminescence. It was tried to incorporate a broad band of Ce3+ activator into the line peaks of Tb3+ in YAG host without the reduction of emission intensity. Ce-codoped YAG:Tb particles showed a broad band emission due to the d-f transition of Ce3+ and a reduction in the intensity of emission peaks due to 5D3-7Fj (j=3, 4, 5, 6) transition of Tb3+ when they were excited by the ultraviolet light of 270Â nm. These results supported that an effective energy transfer occurs from Tb3+ to Ce3+ in YAG host. Codoping Ce3+ ions greatly intensified the excitation peak at 270Â nm for the emission at 540Â nm of Tb3+, which means that more lattice defects, involving in the energy absorption and transfer to Tb3+, are formed by the Ce3+ codoping. The finding gives a promising approach for enhancing the luminescence efficiency.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Kyeong Youl Jung, Hyun Woo Lee,