Luminescence And Optical Temperature Properties Of The Rare-earth Doped Glass Ceramic

Rare-earth doped upconversion materials are widely used in many fields,such as visible detection of infrared radiation,three-dimensional display and optical temperature sensors.Among these applications,optical temperature sensors based on the fluorescence intensity ratio?FIR?technique is considered to be the key technical means for realizing the nano-temperature measurement due to the high sensitivity and reduction the dependence of measurement condition.In this paper,Er³⁺-Tm³⁺ co-doped NaGdF₄,Yb³⁺,Er³⁺,Tm³⁺ co-doped LaSr2F7 and Er³⁺-Tm³⁺ co-doped NaYbF₄ glass ceramics were systematically studied.The details are as follows:The transparent glass ceramics of Er³⁺-Tm³⁺ co-doped NaGdF₄ nano-ceramics was prepared through high temperature solid phase method in the second chapter.The internal microscopic size and morphology were studied by transmission electron microscopy and X-ray diffraction.The fluorescence spectra of Er³⁺ single-doped NaGdF₄ and Er³⁺-Tm³⁺ co-doped NaGdF₄ glass ceramics were analyzed and the energy level was analyzed.The temperature spectrum was measured.The fluorescence quenching ratio of the sample was calculated.The maximum value of relative sensitivity?SR?is 0.001 K-1 at 334 K.It was found that it had good sensitivity at range of middle temperature.Yb³⁺,Er³⁺,Tm³⁺ co-doped LaSr₂F₇ nano-ceramics were prepared through high temperature solid phase method in the third chapter.The internal microscopic size and morphology were studied by transmission electron microscopy and X-ray diffraction.The fluorescence spectra of LaSr₂F₇ glass ceramics were analyzed.The emission spectra of LaSr₂F₇ with the temperature change were tested under the excitation of 980 nm.The fluorescence intensity ratio and the sensitivity were calculated and the maximum value of relative sensitivity?SR?of is 6.86×10-5 K-1 at 546 K.It has potential applications in the range of middle temperature.The transparent nano-ceramics of Er³⁺-Tm³⁺ co-doped NaYbF₄ was prepared through high temperature solid phase method in the fourth chapter.The internal microscopic size and morphology were studied by transmission electron microscopy and X-ray diffraction.The temperature spectrum was measured.According to the experimental data,the fluorescence quenching ratio of the sample was calculated.It was found that Er³⁺ and Tm³⁺ ions had a thermal coupling phenomenon.The pair of thermal coupling energy of Er³⁺ ions reached the maximum sensitivity of 0.0037K-1 at about 238 K,while the pair of thermal coupling energy of Tm³⁺ ions reached the maximum Sensitivity 0.0005K-1 at 1260 K.It has a good sensitivity in the low temperature to high temperature range.