Y3+ substituent tuning of Sr3(PO4)2:Eu2+/Mn2+ with enhanced emission intensity, tunable luminescence, and improved thermal stability

In order to improve luminescence properties of phosphor, the cation substitution was considered one of the most effective ways. For Sr-3(PO4)(2):Eu2+, the luminescence properties may be improved by doped Y3+, and experimental results show the emission intensity enhanced two times and the thermal stability also increased from 93 % to 98 %. Generally, the emission intensity of Mn2+ for Sr-3(PO4)(2):Mn2+ and co-doped Eu2+/Mn2+ in Sr-3(PO4)(2) is really weak, however, when incorporated Y3+, it was enhanced. For Sr2.765-yY0.15(PO4)(2):0.01Eu(2+),yMn(2+), emission peaks of Eu2+ and Mn2+ are observed located at 420nm and 579nm, respectively, and the value of IMn2+/IEu2+ gradually enhancement from 0 to 0.35, when Mn2+ concentration increases from 0 to 0.20. In addition, the energy transfer from Eu2+ to Mn2+ is proved, and the energy transfer mechanism is dipole-dipole interaction. Finally, series of color-tunable phosphors are achieved by properly adjusting Mn2+ concentration. The results indicate that cation substitution is very effective method for improving the luminescent properties of phosphors.