Preparation And Performance Study Of Yb³⁺,Tm³⁺ Co-doped Gadolinium Lanthanum Oxide Transparent Laser Ceramic

Tm,Yb:（GdLa）₂O₃ nano-powder was prepared by a coprecipitation method with polyethylene glycol as a dispersing agent.According to the control variable method,through a series of samples of the powder was determined by X-ray diffraction and scanning electron microscopy. The results show that the optimum conditions for ceramic powders: calcination temperature was 850℃;the value of pH is 7; doping mole fraction of La³⁺ is 25%; doping mole fraction of Tm³⁺ is 4%; the Tm,Yb:（GdLa）₂O₃ nano-powder with the around average particle size of 50 nm can be obtained under the optimum conditions. The features of excitation and emission spectra of Tm,Yb:（GdLa）₂O₃ ceramics at room temperature were investigated. The most intense excitation and emission peaks are centered at 360 nm and 454 nm, which are corresponding to the1D2→3H6 and1G4→3H6 level transitions of Tm³⁺.The Tm,Yb:（GdLa）₂O₃ ceramic was synthesized by cold isostatic-vacuum sintering method with TEOS as sintering aids.The ceramic samples was determined by scanning electron microscopy and transmission curve. The results show that the optimum conditions for ceramic: sintering temperature is 1750℃; sintering time is 20h.Infrared Spectrum of the power has been tested. The results show that the power with a stable structure crystal phase of Tm,Yb:（GdLa）₂O₃ was verified. The transmittance rate of the sample has been tested.Upconversion Fluorescence Spectrum of the power has been tested. The pump light at a wavelength of980 nm ex-citation. The results show that twin emission peaks of Tm³⁺ were centered at 486nm（blue light）, 660nm（red light）, which are corresponding to the ¹D₂→³H₆ and ³F₂→³H₆ level transitions of Tm³⁺. In addition, the light transition mechanism was also discussed.