The photoluminescence properties of SrSi2O2N2: Eu~(2+) nano oxynitride phosphor for white light emitting diodes

摘要

The effect of activator on the structural and luminescent properties of Sr_(1-x)Si2O2N2:Eu_(2+x) nano oxynitride phosphor was investigated. In other to achieve small spherical particles with smooth and round surfaces particles, Sr_(1-x)Si2O2N2:Eu_(2+x) phosphors were synthesized by solid state reaction method. Sr_(1-x)Si2O2:Eu_(2+x) oxynitride phosphor was synthesized with different Eu~(2+) doping concentrations at 800°C ～ 1200°C for 6 hrs under a reducing nitrogen atmosphere containing 5% H2. The characteristics of the synthesized Sr_(1-x)Si2O2N2:Eu_(2+x) oxynitride phosphor were investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL). The results of characterization showed that both of the prepared phosphors are nanosized particles. The phosphors exhibited the green to yellow emission spectrum for near excitation. The influence of Eu~(2+)content on the crystalline structure of the produced powders of Sr_(1-x)Si2O2N2:Eu~(2+x) phosphors was studied. As the doping concentration of Eu~(2+) was increased, there was a shift in the continuous emission stpectra. The material can be a promising candidate for the potential application as a fluorescent material in a white light-emitting diodes (W-LEDs).