Sol-gel synthesis and luminescent performance of Eu³⁺, Lu³⁺ co-doped Ca_0.3Sr_0.7Mo_1-xW_xO₄ red-emitting phosphor

Abstract

Red-emitting Ca_0.3Sr_{0.7-1.5y-1.5z}Mo_1-xW_xO₄:Eu_yLu_z (x = 0 ∼ 1, y, z = 0 ∼ 0.14) phosphors were synthesized by a sol-gel method. The effects of calcination temperature, Lu³⁺ and Eu³⁺ concentrations, and W/Mo ratio on the luminescent properties were studied in detail. The phosphors were characterized by XRD, SEM, and XPS. The luminescent properties were measured by fluorescence spectra. Experiments showed that the Lu³⁺ and Eu³⁺ co-doped phosphors had strong red emission at 619 nm. At x = 0.2, y = 0.1 and z = 0.1, the phosphors calcined at 900 °C showed a maximum emission intensities. Temperature dependent emission intensities of the phosphors showed that the luminescent intensities of the as-prepared phosphors were thermal stable. The decay results showed the energy transfer efficiency from MoO₄^2- to Eu³⁺ increased from 0 to 0.2 with the increase of the Mo⁶⁺ concentration.

Keywords:

• Scheelite
• sol-gel synthesis
• LED
• luminescence

Additional information

Funding

The research was supported by the National Natural Science Foundation of China under grant no. 51708447 and Shaanxi Provincal Natural Science Foundation under grant no. 2019JM-390.