Temperature Controlled Luminescence Behavior Of Rare-earth Doped Photoluminescence Materials

So far, Rare-earth（RE） doped photoluminescence materials for optical temperature sensing have attracted widely attention. Compared with traditional temperature monitoring devices, optical thermometry has the advantages of quantitatively global temperature/heating information, high sensitivity, and accuracy since it is basically not affected by the spectral losses and fluctuations of the excitation intensity. As an optical thermometry method, the fluorescence intensity ratio（FIR） technique based on the measurement of luminescence intensities from two thermally coupled levels of one RE ion in photoluminescence materials was studied widely during the past decade. In this paper, Eu³⁺, Yb³⁺and Er³⁺ ions are chosen as activators and nano-materials act as host materials. And the temperature sensing properties of MF₂（M=Ba, Ca, Sr） transparent glass ceramics, Y₂O₃ nanorods and Gd₂O₃ nanorods are studied. The specific contents are as follows:Eu³⁺ doped MF₂（M=Ba, Ca, Sr） transparent glass ceramics have been prepared by melt-quenching method. The size and shape of the samples were studied by XRD and TEM method. The excitation spectra and emission spectra of MF₂ samples were tested. With the increase of temperature, the sensitivity and optical thermometry of MF₂ samples were studied. The fitting of experimental data and the sensitivity were figured out.The Y₂O₃:Yb³⁺/Er³⁺ nanorods were prepared by hydrothermal process. The XRD and SEM images show the size and morphology of the nanorods. The luminescence spectra of different concentration of Yb³⁺ ions doped Y₂O₃:Er³⁺ nanorods were tested and energy transfer in the thermal coupled levels was discussed. The temperature sensing of samples based on fluorescence intensity ratio（FIR） were studied.The Gd₂O₃:Yb³⁺/Er³⁺ nanorods were synthesized by hydrothermal method. The size and shape of samples were controlled. The XRD and SEM images show the size and morphology of the nanorods. The temperature sensing of Gd₂O₃:Yb³⁺/Er³⁺ nanorods based on fluorescence intensity ratio（FIR） were discussed.