Upconversion Luminescence Properties of Yb3+/Tm3+ Co-Doped Phosphate Glass

In this paper, Yb3+/Tm3+ co-doped phosphate glass is prepared using a high- temperature melting method, and the effects of Tm3+ mole fraction and Te4+ mole fraction in the glass matrix on the upconversion luminescence properties of the glass are discussed. The absorption spectrum shows that the absorption positions of Yb3+ and Tm3+ ions in the glass do not interfere with each other at the wavelength of 300-1450 nm. The upconversion luminescence properties of the asprepared glass samples under 980 nm wavelength laser diode pumping are investigated. The results indicate that Yb3+/Tm3+ has upconversion luminescence peaks at 476 nm ((1)G(4)-> H-3(6)), 650 nm ((1)G(4)-> F-3(4)), and 793 nm (H-3(4)-> H-3(6)), among which the near-infrared luminescence peak at 793 nm is the strongest. The luminescence intensity at 476 nm is the next highest and the lowest at 650 nm. The intensity of the three abovementioned luminescent peaks can be tuned by adjusting the Tm3+ mole fraction and the Te4+ mole fraction in the glass matrix.