Abstract
Er3+/Yb3+/Tb3+ tri-doped Na5Lu9F32 single crystals were prepared by a Bridgman method. The spectroscopic characteristics of the synthesized single crystals were systematically investigated. Intense green and red emissions originated from transitions for Er3+ and Tb3+ ions were observed. It was found that the introduction of Tb3+ ions to the Er3+/Yb3+ co-doped single crystals can effectively adjust the emission from near-infrared (NIR) to visible region for Er3+ ions. The emissions at 660, 522 and 542 nm from Er3+/Yb3+ co-doped single crystals were enhanced as the Tb3+ concentration increases. The energy transfer mechanisms among Er3+, Yb3+ and Tb3+ ions were also discussed. Analysis on the decay curves suggests that electric dipole-dipole is dominant for the energy transfer from Tb3+ to Er3+ ions. According to the measured lifetimes of Er3+/Yb3+ and Er3+/Yb3+/Tb3+ doped samples, the maximum energy transfer efficiency from Tb3+ to Er3+ approaches up to 11.7%. The intense green and red up-conversion observed in the Er3+/Yb3+/Tb3+ tri-doped Na5Lu9F32 single crystals make them promising candidates for solid-state multicolor displays, temperature sensors, and biomedical imaging applications.
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