Abstract
The novel red-emitting phosphors of Eu3+-activated CaSr2Al2O6:Eu3+ were synthesized by conventional solid state reaction. Crystal structure, characteristic luminescence properties and charge compensators effect (Li+, Na+, K+) are investigated in detail by X-ray diffraction refinement and photoluminescence spectra measurement. CaSr2Al2O6 crystallizes in a cubic structure with the space group of Pa(3)–205, and cell parameter a = b = c = 15.06217(5)Å. The difference between the emission spectra of CaSr1.90Al2O6:0.10Eu and Ca0.90Sr2Al2O6:0.10Eu revealed that the Eu3+ ions occupied nonequivalent Sr2+ or Ca2+ sites with different site symmetry. When Eu3+ ions occupied Sr2+ sites without inversion symmetry, the intensity ratio of (5D0-7F2)/(5D0-7F1) is higher and thus a better color purity. CaSr1.92Al2O6:0.08Eu3+ exhibits strong absorption at 394 nm and intense red emission with CIE chromaticity coordinates (0.6408, 0.3581). The critical distance of the concentration quenching and thermal stability are also investigated.
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