Photoluminescence Properties of Ce~(3+)/Eu~(2+)Co-doped Ca_3Si_2O_4N_2 Phosphors

A novel Ce3+/ Eu2+co-activated Ca3Si2O4N2 phosphor was synthesized by traditional solid-state reaction. The phosphors were characterized by X-ray diffraciton( XRD) and fluorescence spectrophotometer( PL). XRD patterns reveal that the samples maintain Ca3Si2O4N2 single phase after doping Ce3+and K+ions. The emission spectra under 355 nm excitation show the typical broad band of Eu2+ peaking at about 505 nm( 5d-4f). The emission could be greatly enhanced through doping Ce3+and K+in Ca3Si2O4N2∶ Eu2+phosphors. K+ions could be used as charge compensation in Ca3Si2O4N2∶ Eu2+,Ce3+phosphors. When the mole fractions of Ce3+and K+are 1%,the emission intensity reach the maximum,which is about 168% of that of the sample without doping Ce3+or K+. And the critical distance is calculated to be about 2. 535 nm by the spectra overlap method.