Abstract
A series of Ca3Sr3(PO4)4:Dy3+, M+ (M = Li and Na) white-emitting phosphors was prepared via a high-temperature solid-state reaction, where M+ was co-doped in Ca3Sr3(PO4)4:Dy3+ as charge compensators for enhancing its luminescence. Effects of synthesis temperature and charge compensator M+ on the structure and luminescence properties of as-prepared phosphors were studied in detail. The results of X-ray diffraction indicate that the structures of Ca3Sr3(PO4)4:Dy3+, M+ samples were in agreement with the standard Ca2Sr(PO4)2 phase. Under excitation of 352 nm, there are two apparent peaks at 484 nm (blue) and 577 nm (yellow) in the emission spectra of Ca3Sr3(PO4)4:Dy3+, M+ samples, which corresponding to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 electron transitions of Dy3+ ions, respectively. Luminescence intensity and lifetime of Ca3Sr3(PO4)4:Dy3+ can be significantly enhanced through adding a charge compensator M+, which suggest that Ca3Sr3(PO4)4:Dy3+, M+ can be used as a single-phase white-emitting phosphor in the applications of white light-emitting diodes.
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