A novel single-composition tunable color emission KSrY(PO4)2:Ce3+, Tb3+, Mn2+ phosphor based on energy transfer

• A novel white-emitting phosphor KSYP:Ce3+, Tb3+, Mn2+ had been synthesized.
• KSYP:1Ce3+, 36Mn2+ phosphor showed high energy transfer efficiency over 60%.
• The energy-transfer mechanism from Ce3+ to Mn2+ was dipole–dipole interaction.
• KSYP:1Ce3+, 1Tb3+, 6Mn2+ showed CCT = 5110 K, Ra = 46 and CIE of (0.341, 0.337).

A novel single-composition white-emitting phosphor KSrY(PO4)2:Ce3+, Tb3+, Mn2+ has been synthesized by a high-temperature solid-state reaction. The spectral overlap between the emission band of Ce3+ and the excitation band of Mn2+ supported the occurrence of the energy transfer from Ce3+ to Mn2+, and demonstrated to be the dipole–dipole interaction. The energy transfer efficiency (Ce3+ → Mn2+) obtained by decay curves was consistent with the result calculated by the emission intensity, which gradually increased from 14.5% to 65.8% by increasing the Mn2+ doping content from 0.02 to 0.36. The mechanism of transferring energy from Ce3+ to Tb3+ and Ce3+ to Mn2+ was also discussed in this study. A single composition white-light emitting phosphor KSr0.94Y0.98(PO4)2:0.01Ce3+, 0.01Tb3+, 0.06Mn2+, which shows correlated color temperature of 5110 K, color rendering index of 46, and color coordinates of (0.341, 0.337), was obtained. The results indicate that the KSrY(PO4)2:Ce3+, Tb3+, Mn2+ phosphors have potential applications as an ultraviolet-convertible phosphor.

A novel single-composition white-emitting phosphor KSrY(PO4)2:Ce3+, Tb3+, Mn2+ had been synthesized by a high-temperature solid-state reaction. The mechanism of transferring energy between Ce3+, Tb3+ and Mn2+ ions was discussed in this study. By controlling the doping content of the Mn2+ ions with a fixed Ce3+ content, the emission color of the phosphor varied from blue region (0.169, 0.019) to white region (0.342, 0.304) and eventually to orange region (0.453, 0.441). In conclusion, the results indicated that the color-tunable phosphor KSrY(PO4)2:Ce3+, Tb3+, Mn2+ can be a promising candidate to serve as the potential phosphor.Figure optionsDownload as PowerPoint slide