|
The Yb2(MoO4)3:Ln3+ (Ln=Ho, Tm, Er) phosphors were synthesized by hydrothermal method with further calcination. The crystal structure and morphology of samples were characterized by X-ray diffraction and scanning electron microscopy. The effects of rare earth ion interaction in Yb2(MoO4)3:Ln3+ phosphors on upconversion (UC) luminescence properties and energy transfer process at different doping concentrations were discussed. It is concluded that by doping Ho3+, Tm3+, Er3+ in Yb2(Mo O4)3 matrix, the phosphors emit orange-yellow, blue and green light, respectively, and the energy transfer of Yb3+ →Ho3+/Er3+ and Yb3+ → Tm3+ were two and three photons process. Under the excitation of 980 nm laser, by changing the of Ho3+/Tm3+ ratio in doped Yb2(MoO4)3, we have realized the transition of phosphors from cold white light to warm white light. The temperature sensitivity of 2H11/2 and 4S3/2 energy levels of Yb2(MoO4)3:Er3+ in the range of 323 ~ 573 K was studied by FIR technique. The experimental results show that the maximum absolute sensitivity was 0.0081 K-1 at 573 K and the maximum relative sensitivity was 0.01 K-1 at 323 K. Compared with other materials, Er3+ doped Yb2(MoO4)3 phosphor is an excellent optical temperature sensing material.
|
