Flux assisted low-temperature synthesis of YAG : Yb3+,Er3+ and its optical property
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Yb3+/Er3+ co-doped polycrsytalline yttrium-aluminum garnet (YAG : Yb3+,Er3+) powders were synthesized by a flux (BaF2)assisted solid-state reaction method at low-temperature. The optimum condition of flux concentration and calcinationtemperature was investigated by the XRD analysis. Crystal structure and upconversion luminescent property of the synthesizedYAG : Yb3+,Er3+ powder was analyzed as a function of Yb3+ concentration when concentration of Er3+ was fixed at 25.0 mol%. Under 980 nm excitation, YAG : Yb3+,Er3+ powder exhibited weak red emissions near 660 and 670 nm, and strong green UCemissions at 530 and 550 nm corresponding to the intra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The Yb3+15 mol% doped YAG : Yb3+,Er3+ powder sample exhibited strongly shiny green emission. A possible UC mechanism forYAG : Yb3+,Er3+ depending was discussed in detail.
Abstract
Yb3+/Er3+ co-doped polycrsytalline yttrium-aluminum garnet (YAG : Yb3+,Er3+) powders were synthesized by a flux (BaF2)assisted solid-state reaction method at low-temperature. The optimum condition of flux concentration and calcinationtemperature was investigated by the XRD analysis. Crystal structure and upconversion luminescent property of the synthesizedYAG : Yb3+,Er3+ powder was analyzed as a function of Yb3+ concentration when concentration of Er3+ was fixed at 25.0 mol%. Under 980 nm excitation, YAG : Yb3+,Er3+ powder exhibited weak red emissions near 660 and 670 nm, and strong green UCemissions at 530 and 550 nm corresponding to the intra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The Yb3+15 mol% doped YAG : Yb3+,Er3+ powder sample exhibited strongly shiny green emission. A possible UC mechanism forYAG : Yb3+,Er3+ depending was discussed in detail.
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