Synthesis And Optical Temperature Sensing Of Rare-earth Doped Photoluminescence Materials

Rare-earth doped photoluminescence materials for optical temperature sensing have been widely used in recent years. Due to the advantages of anti outside interference and anti excitation power, temperature measurement based on the principle of Fluorescence Intensity Ratio(FIR) has been paying more and more attention, in which rare earth doped up-conversion material plays a prominent role and has a very broad application prospects.Currently, rare earth activated ions based on Fluorescence Intensity Ratio are focus on Er3+,Nd3+,Yb3+, especially Er3+. Rare earth ions such as Pr3+?Tm3+ are rarely studied although they have the same properties. In this paper, Tm3+ ion is chosen as activator and core-shell structure materials acts as host materials. Core-shell structure materials can not only give full play to the diversity of themselves, but also give full play to the material in the related properties of core and shell, such as electromagnetism, photo catalysis, spectroscopy, biological fluorescent tags, and so on. The specific contents are as follows:Eu3+/Dy3+ activated Ba Ca2Y6O12 photoluminescence materials have been prepared via solid state reaction and their luminescent properties, energy transfers and thermal properties were investigated in detail. The luminescence intensity of Ba Ca2Y6O12 is 91% of the initial value at 623 K,which shows excellent thermal stability.Preparation and optical properties of Si O2 coated fluoride materials have been prepared by improved Stober synthesis method. We studied the size controlled synthesis and growth mechanism of Si O2 coating and the emission spectrum with different coating thickness. We also prepared different fluoride materials @ Si O2 under the same coated thickness for comparison.Tm3+ ion is chosen as activator and Yb3+ ion acts as sensitizers. The core materials is Na Yb F4 with high conversion efficiency and the protection shell are Si O2, Ti O2 and Zr O2, respectively, which can prevent fluoride materials from oxidation at high temperature. First we studied the properties of emission spectrum with different shells, and then the properties based on FIR were researched with different shells. The choice of thermal coupling level of Tm3+ ion, the fitting of experimental data, and the sensitivity were figured out and compared.