[The up-conversion of frequency in Yb3+ :KGd(WO4)2 material]

By using the method of solid phase synthesis, a series of samples of KYbxGd(1 - x) (WO4)2 with different Yb3+ mole fraction of x = 0.03, 0.08, 0.10, 0.12, 0.15, 0.18, 0.20, 0.25, 0.28, respectively were synthesized when they were heated at 1,000 degrees C. Their fluorescence spectra were measured by using LD with a wavelength of 980 nm as the pumping source and RF-540 fluorescence spectrum measurement device. The weak fluorescence at 1,020 nm and strong blue fluorescence at 476 nm were obtained. Also, the relationship between the Yb3+ doping mole fraction and the fluorescence intensity at 476 nm was measured. The result indicates that the intensity of blue fluorescence increases rapidly with the increase of Yb3+ doping mole fraction and reaches the highest point at the Yb3+ doping mole fraction of 25%, then drops quickly with the increase of Yb3+ doping mole fraction. The result also indicates that the fluorescence intensity at 1,020 nm reaches the highest point when the Yb3+ doping mole fraction is about 8%-10%.