Mixing the valence control of Eu2+/Eu3+ and energy transfer construction of Eu2+/Mn2+ in the solid solution (1 − x)Ca3(PO4)2–xCa9Y(PO4)7 for multichannel photoluminescence tuning

摘要: Recently, controllable photoluminescence tuning by devising a solid solution framework, adjusting the valence mixing of Eu2+/Eu3+ and designing efficient energy transfer between activator ions has been extensively investigated reported due to its significant advantages in improvement regulation luminescence performances white light-emitting diodes (W-LEDs). In this study, we designed series novel Eu2+-doped (1 − x)Ca3(PO4)2–xCa9Y(PO4)7 (x = 0–1.0) isostructural phosphors with β-Ca3(PO4)2-type structure, powder samples were prepared via traditional high-temperature solid-state reaction process. The crystal field variation around Eu2+ causes superposition linear induces optical property change ratio, x, values. Besides high-energy emission peak at 418 nm Ca3(PO4)2:0.03Eu2+, another low-energy 486 was observed formation solution. Moreover, corresponding peaks shifted from 430 nm, intensity increased an increase which attributed combined effect splitting local lattice luminescence. addition, tunable across whole light region could be realized constructing overall Eu concentration x)Ca3(PO4)2–xCa9Y(PO4)7:Eu 0.5, 0.7, 0.9, 1.0), mechanisms have proposed discussed detail. pursuit precise color tuning, also tested → Mn2+ different compositions 0.2, 0.9) phosphors, successive blue cyan range then red successfully achieved. Finally, temperature-dependent decay time revealed systematically, for thermal quenching behavior discussed. This study provides new perspective originating simultaneous solution, transfer.