A novel white emitting phosphor Ca2PO4Cl:Dy3+: luminescence, concentration quenching and thermal stability

A novel white emitting phosphor Ca2PO4Cl:Dy3+ was synthesized by a solid state method. The luminescence, concentration quenching and thermal stability of Ca2PO4Cl:Dy3+ were investigated. Ca2PO4Cl:Dy3+ showed three emission peaks, which were located at 483, 575 and 660 nm. Though the ratio of yellow to blue emission intensities showed a similar value, the intensities of yellow and blue peaks were influenced by Dy3+ concentration, and the concentration quenching effect was observed. The emission intensity of Ca2PO4Cl:Dy3+ as a function of temperature was explored and the emission intensity (at 150 °C) of Ca2PO4Cl:Dy3+ was 90.0% of the value at 25 °C, and activation energy was 0.18 eV. The results indicated that Ca2PO4Cl:Dy3+ might be conducive to development of white LEDs.

Graphical AbstractEmission (a), excitation (b) spectra of Ca2PO4Cl:0.05Dy3+ and transitions of Dy3+ (c)Figure optionsDownload as PowerPoint slide