Effects of Charge Compensators on Structure and Luminescent Properties of Microwave Synthesized CaMoO_4:Eu~(3+) Red Phosphors

摘要

Red phosphors CaMoO_4:Eu~(3+) were synthesized by microwave method with MnO_2 as microwave absorbent. The phase structure and luminescent properties of the as-synthes;m. phosphors were investigated by X-ray powder diffraction and Fluorescence spectrophotometer,The results show that when the reaction time was 40 min, microwave power was medium-high fire (-560 W), we got the tetragonal CaMoO_4:Eu~(3+) pure phase. The excitation spectrum of CaMoO_4:Eu~(3+) was composed by a broad band between 200 nm and 350 nm and a series of peaks from, 350 nm to 500 nm. The main peak was at 305 nm. The emission spectrum was composed of a series of peaks in the range of 550-750 nm and the main peak was at 617 nm due to the ~5 D_0→~7F_2 Transition of Eu~(3+) Doping charge compensator Li~+, Na~+ or K~+ could improve the luminous intensity of the sample When the doping amount of Li~+, Na~+ or K~+ were 8 mol%, the luminous intensity of the sample reached the maximum. The intensity of the emission peak at 617 nm was 4.04, 3.42, 3.48 Times u sample without doping charge compensator.