Tunable luminescence of Ce3+/Li+, Eu2+ co-doped Ca4(PO4)2O phosphor for white light emitting diodes

Phosphors Ca4(PO4)2O:Ce3+/Li+, Eu2+ were prepared by solid state reaction successfully, and characterized by X-ray diffraction, UV-Vis spectrometer and photoluminescence spectrometry. The as-prepared phosphors exhibited strong absorption in the UV-visible region and dual-emission bands centered at approximately 460 and 630 nm. Energy transfer from Ce3+ to Eu2+ was also observed. By varying the excitation wavelength, these new phosphors exhibited tunable emissions from blue to white and then to yellow, making them potential candidates as UV-convertible phosphors for white light emitting diodes.

Graphical AbstractEmission spectrum of Ca4(PO4)2O:0.1Ce3+/Li+,0.06Eu2+ under different excitation wavelengths ranging from 345 to 450 nm (The inset is the excitation spectra monitored at 460 nm and 630 nm respectively)Figure optionsDownload full-size imageDownload as PowerPoint slide