Yellow-green-emitting SrSi 2 O 2 N 2 :Eu 2+ phosphors were synthesized with Sr 2 SiO 4 :Eu 2+ as precursor. The effects of flux and the concentration of Eu 2+ on the crystal structure and luminescent properties of the phosphors were investigated. Results suggested that the optimal content of flux Na 2 CO 3 was 1 wt% and the optimal doping concentration of Eu 2+ was 0.05 mol. The emission spectra showed the most intense peaks located at 535 nm which corresponded to the 4f 6 5d→4f 7 transition of Eu 2+ . The excitation spectra showed that these phosphors could be effectively excited by near-ultraviolet and blue light, whichwas consistent with the widely applied output wavelengths of near-ultraviolet and blue-white light-emitting diode (LED) chips. When the influence of flux on the luminescent properties of SrSi 2 O 2 N 2 :Eu 2+ phosphor was analyzed, the X-ray diffraction (XRD) patterns indicated that the flux could help the crystallization of the phosphors. No other phases except the triclinic structure of SrSi 2 O 2 N 2 were formed. The thermal stability and the emission intensity of synthesized SrSi 2 O 2 N 2 :Eu 2+ phosphor were examined and compared with commercial YAG yellow phosphors. All results indicate that the yellow-green-emitting phosphor is a suitable candidate for the fabrication of white LEDs. flux, nitrogen oxides, yellow-green-emitting, white LEDs PACS number(s): 78.55.Qr, 78.66.Jg, 81.05.Gc, 33.15.Hp, 78.55.Et
Citation:Xie A, Shi Y, Wang Y W. Effects of flux on crystal structure and luminescent properties of nitroxides phosphors.