Abstract
To explore new phosphor materials for optical temperature sensors, the Yb3+-Ho3+ and Yb3+-Er3+ doped Sr5(PO4)3Cl (SPC) phosphors were prepared by the solid-state reaction method, and their upconversion luminescence properties were investigated. Upon 980 nm excitation, three emission peaks around 543, 668, and 758 nm are found for SPC:Yb3+,Ho3+, which could be attributed to the typical Ho3+ transitions. For the SPC:Yb3+,Er3+ phosphor, the dominant emission peak is located around 673 nm and the green emission peaks are very weak. By studying the dependence of intensities on the excitation powder, all the observed emission peaks for Yb3+-Ho3+ and Yb3+-Er3+ doped SPC samples are two-photon processes. The temperature-dependence measurement reveals that the fluorescence intensity ratios of 668/543 nm emissions for Ho3+ and 522/544 nm emissions for Er3+ change with the temperature. The reason has been interpreted by the energy level diagram, decay curves and so on. The sensitivity of the present samples were evaluated with the temperature changed from 293 to 553 K, and the high sensitivities have been obtained.
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