Ce3+/Tb3+ co-doped KBaY(BO3)2: A color-tunable blue-green phosphor for near-UV white LEDs
Owing to the flexible composition, superior physicochemical properties and relative low synthesis temperature, rare-earth borates have attracted considerable attention as phosphor hosts. In this work, a series of Ce3+/Tb3+ co-doped KBaY(BO3)2 samples have been synthesized via a traditional high temperature solid-state reaction. The crystal structure and luminescence properties, especially the energy transfer behavior from Ce3+ to Tb3+, are discussed in detail. The energy transfer from Ce3+ to Tb3+ in the KBaY(BO3)2 host have been demonstrated to be resonant type via a dipole–dipole interaction mechanism and the critical distance of energy transfer was calculated to be 13.84 Å based on the concentration quenching theory. Tunable emission from blue to cyan, and eventually to green was realized by controlling the dopant content of the Ce3+/Tb3+ ions.
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Document Type: Short Communication
Publication date: December 1, 2014
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