Abstract
Single-crystal CaAl2O4 fibers doped with Ce 3+ or Tb3+ or double doped with Tb3+ and Ce3+ were prepared by the laser-heated pedestal-growth method. Ce3+-doped CaAl2O4 was found to have persistent phosphorescence in the blue violet lasting more than 10 h, while Tb 3+-doped CaAl2O4 showed only a weak afterglow. However, long persistent green phosphorescence from Tb3+ was observed in the doubly doped fiber, CaAl2O4:Tb3+, Ce3+. It was found that the enhanced green phosphorescence from Tb3+ is due to persistence energy transfer from the thermally released electrons to Ce3+ followed by energy transfer to Tb 3+. The finding suggests a promising approach for controlling the color of persistent phosphors.
Original language | English |
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Pages (from-to) | 1535-1537 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 80 |
Issue number | 9 |
DOIs | |
State | Published - Mar 4 2002 |