Abstract
A novel single-phase full-color phosphor Ca9Bi(PO4)7:Dy3+ was synthesized by a high-temperature solid-state reaction. X-ray powder diffraction analysis confirmed the phase formation of Ca9Bi(PO4)7:Dy3+ material. The photoluminescence (PL) excitation and emission spectra and the concentration dependence of the emission intensity of the phosphor were investigated. The results show that the phosphor could be efficiently excited by near-UV (NUV) light (340–440 nm), exhibiting blue (487 nm) and yellow (577 nm) emissions corresponding to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions, respectively. The luminescence intensity of Ca9Bi1−x(PO4)7:xDy3+ phosphor first increased and then decreased with increasing Dy3+ concentration and reached the maximum value at x = 0.20. The effect of Mg2+ co-doping concentration on the PL intensity of the as-prepared samples was also investigated. The calculated color coordinates lie in the white region. Therefore, the obtained results suggest that the prepared phosphors have great potential for use as single-phase full-color phosphors for NUV white-light-emitting diodes.
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