Upconversion Luminescence Of Rare Earthions Codoped Oxyfluori Deglass Ceramics And Temperature Characteristics

Upconversion luminescence has widely been applied in the field of short-wavelength lasers, bioluminescence, three-dimensional displays and optical tempe-rature. Due to unique physical and chemical properties and low phonon energy, oxyfluoride glass ceramic becomes one of the hot spots of the study of the rare-earth doped materials.In this article, firstly, Er3+/Yb3+, Tm3+/Yb3+, Er3+/Tm3+/Yb3+codoped oxyfluoride glass and glass ceramic were prepared by high-temperature solid-phase method.980nm semiconductor diode laser was choosen as excitation source. The upconversion spectra of precursor glass was compared with that of annealed glass. The reason for the change in intensity after crystallization was analyzed which proved rare earth doped oxyfluoride glass can be applied in the solid-state light-emitting materials, upconversion laser and biological fluorescence. The fluorescence spectrum of samples with the change of pump intensity was measured and upconversion mechanism of rare earth ions before and after heat treatment was studied.Secondly, the fluorescence spectrum of Er3+/Yb3+doped and Tm3+/Yb3+doped oxyfluoride glass ceramic were measured at different temperatures. The4F9/2state of Er3+in glass ceramic applied in temperature sensor was studied. The temperature characteristics of upconversion blue (1G4â†'3H6) of Tm3+/Yb3+co-doped was explored. Then the application value of Er3+/Yb3+, Tm3+/Yb3+doped oxyfluoride glass ceramic in prepareing the non-contact fluorescent temperature sensor was studied.Finally, the experiment in studing the fluorescence characteristics of Er3+Tm3+Yb3+codoped oxyfluoride glass was carraied out. Intense red (655nm) blue(475nm), green(525and550nm) emissions were observed in the samples under980nm infrared excitation. This illustrates the color modulation and white light emission can be achieved by changing the intensity of the three primary colors. In addition, the changes in intensity of the red, blue and green light were measured at different temperature and the reason for these changes was discussed. The changes curve between Er3+ion concentration and intensity of three primary colors were analyzed and it were fitted by their CIE color system. This demonstrates changing the concentration ratio of the rare-earth ions can make Er3+/Tm3+/Yb3+co-doped oxyfluoride glass emit light with different colors, then make color adjustable.