Abstract
A series of Eu2+ doped ACaPO4 (A = Li, Na, K) phosphors were synthesized by a solid state reaction. The phase, microstructure and luminescent properties of the obtained phosphors were investigated. The XRD results indicate that the Eu2+ doping has no influence on the phases of ACaPO4 (A = Li, Na, K) hosts. Under the excitation of 365 nm, Eu2+ doped ACaPO4 (A = Li, Na, K) phosphors exhibit emission bands corresponding to 5d–4f transitions of Eu2+ ion and the emission intensity shows concentration-dependence. The peak wavelengths of emission bands for Eu2+ in LiCaPO4, NaCaPO4 and KCaPO4 locate at 478, 508 and 487 nm, respectively. With the temperature increasing up to 500 K, the emission intensities of ACaPO4:5 mol%Eu2+ (A = Li, Na, K) phosphors are decreased to be 75.1, 84.8 and 77.9% of the initial value (300 K) and the emission wavelengths shift to 470, 491 and 476 nm.
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