CaAl2Si2O8 Eu2+ phosphor has been synthesized by the solid state reaction.
The room and high temperature photoluminescence of CaAl2Si2O8:Eu2+ has been investigated.
Based on the photoluminescence analyses, the physical mechanisms for red-shift, concentration quenching and thermal quenching were revealed and discussed.
CaAl2Si2O8:Eu2+ phosphor powder was prepared by a solid state reaction method. Its photoluminescence property at room and high temperature was investigated. Based on the photoluminescence analyses, the physical mechanisms for red-shift, concentration quenching and thermal quenching were revealed. This phosphor shows broad band absorption and emission corresponding to Eu2+ transition between the 4f7 ground state and 4f65d1 splitting states. The emission spectra show red-shift, which is brought by the increase of the crystal splitting of Eu2+ 5d electron in the lattice. Concentration quenching occurs when Eu2+ concentration is more than 5 mol%. The dipole–dipole interaction dominates the concentration quenching. When the temperature is increased to 150 °C, the photoluminescence intensity quenches to 67%. CaAl2Si2O8:Eu2+ could be a candidate for use in pc-wLEDs. And this study may be favorable for understanding the Eu2+ photoluminescence process in the lattice.