Synthesis and Properties of Novel Rare Earth Luminescent Materials Sr(3-x)MgSi3O(10):Tbx(3+)
Novel rare earth luminescent materials Sr3-xMgSi3O10∶ Tb3x +were synthesized by gel-combustion method in activated carbon weak reductive environment. The formation process,phase structure,composition and luminescent properties of the as-synthesized phosphors were investigated by TG-DTA,infrared spectroscopy,X-ray powder diffraction,Energy Dispersive Spectrometer and Fluorescence spectrophotometer. The results show that Sr3-xMgSi3O10∶ Tb3+ phosphors possess the similar tetragonal crystal structure with Sr2MgSi2O7. The excitation spectrum of Sr3-xMgSi3O10∶ Tb3x +has a broad band from 200 nm to 300 nm,and the main peak is at 249 nm. The emission spectrum is composed of a series of peaks,located respectively at 491 nm,544 nm,586 nm,624 nm. These emission peaks are ascribed to Tb3+ transition from 5D4 to 7FJ( J =6,5,4,3). The main emission peak is at 544 nm due to the transition of 5D4→7F5,which results in a yellow-green emitting. In addition,it is found that the reductive temperature and the concentration of doped Tb3+ have great effects on the luminescent intensity of the sample,and the mechanism of concentration quenching was discussed.