Effect of Sulfourea on Luminescent Properties of CaSrS2∶Eu2+ by Combustion Method

The Eu2+ doped red phosphor CaSrS2 was synthesized via the redox reaction of respective metal nitrates and sulfourea by combustion synthesis. A series of phosphor with different ration of sulfourea and the metallic nitrate were prepared and their luminescent properties were studied. The X-ray diffraction analysis (XRD) showed that they were pure crystalloid of CaSrS2, which belonged to cubic crystal structure. The scan electron microscope (SEM) patterns indicated that the size of CaSrS2 crystal would minish with the enhancing of the sulfourea quantity. The excitation spectra showed that there were a strong and two feebleness broad bands, which including two excitation peaks respectively. The emission spectrum was a broad band from 560～700 nm and the main peak located at 620 nm, which was a pure red light. The luminescent intensity of samples changed with the increasing of sulfourea and the intensity would reach the maximum when the sulfourea was 2.5 times of the theory dosage. This is beneficial to promote the performance of luminescence.