Energy transfer and luminescent properties in Tb3+ and Eu3+ co-doped CaMoO4/SrMoO4 thin films

A series of Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films were prepared by a facile solution method, and they were annealed at 550 °C for 2 h. The luminescent properties of the thin films were studied, which involve the energy transfer from Tb3+ to Eu3+. The emission color can be changed from green to red, with increasing Eu3+ doping concentration in Tb3+-doped CaMoO4/SrMoO4 thin films. In addition, it was observed that the PL intensity of Eu3+ will enhance when Tb3+ ions are incorporated into Eu3+-doped CaMoO4/SrMoO4 thin films. The optical band gaps of the luminescent thin films are found to be in the range of 4.49 to 4.72 eV. These results revealed that Eu3+ and Tb3+ co-doped CaMoO4/SrMoO4 luminescent thin films have a significantly potential application in electroluminescent devices.