Ce3+/Tb3+ co-doped KBaY(BO3)(2): A color-tunable blue-green phosphor for near-UV white LEDs

摘要

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 angstrom 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 Ce