Study Of Eu³⁺ Activated Molybdate Red-emitting Phosphors For LED

Eu³⁺activated molybdate red-emitting phosphors were fabricated by a solid statereaction method. Influences of sintering temperature and Eu³⁺concentration on phasestructure, grain morphologies and light-emission properties of Ca_1-xMoO₄: Eu³⁺xphosphor were studied. Results showed CaMoO4pure phase could be obtained attemperature above900℃, and the distribution of particle is almost even. At the sinteringtemperature950℃, both the excitation peak intensity and emission peak intensity wouldbecome strong. Ca_1-xMoO₄: Eu³⁺x（x=0.1,0.15,0.2,0.25,0.3） phosphor can be obtaineda better light-emission property when Eu³⁺doping concentration is x=0.25.It was discussed that alkali metal ions as charge compensation agent can effect onthe structure and light-emission property of Ca_1-xMoO₄: Eu³⁺xphosphor. Results showedalkali metal ions as charge compensation agent can extremely increase the phosphoremission intensity. Emission properties of the phosphor will be the best when Na+andK+as charge compensation.On the basis of the above research, effect on the emission property ofCa_0.5-xZnxMoO₄: Eu_0.25³⁺K_0.25⁺（x=0.06,0.09,0.12）phosphor by doping Zn2+wasstudied. Results showed sensitization could be obtained when doping Zn²⁺and then theemission intensity of the phosphor would be increased, finally the proper dopingconcentration of Zn²⁺can be focused on x=0.09.