Preparation and Characteristics of CaNaMgVO:Sm Single-Phased White-Emitting Phosphors.

Novel single-phased phosphors CaNaMg-VO:xSm that exhibit efficient white-light photoluminescence properties have been successfully synthesized by the solid-state reaction method. The formation of a single CaNaMgVO phase has been confirmed by X-ray powder diffraction (XRD). The wavelength-tunable white light is realized by coupling of the broad emission band at 500 nm due to a V−O charge-transfer state transition and the sharp emission peaks at 564, 616, 650 and 708 nm assigned to G→H (J = 5/2, 7/2, 9/2, 11/2) transitions of the Sm ion. The luminescence color can be tuned from green to white by adjusting the doping concentration of Sm. When the doping concentration of Smis increased from x = 0 to x = 0.20, the color rendering index of the CaNaMgVO:xSm phosphors increased from 55 to 83. The present white phosphors show a great potential for white LEDs. [ABSTRACT FROM AUTHOR]