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Erschienen in:
26.08.2015
A strategy for developing deep-UV phosphor: Sr3AlO4F: Tb3+/Sm3+
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 12/2015
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Abstract
A series of Sr3AlO4F:A (A = Tb3+, Sm3+) phosphors were prepared by solid-state reaction process. The optical properties of Tb3+ and Sm3+ single-doped or co-doped Sr3AlO4F phosphors were researched by means of X-ray diffraction and photoluminescence spectra. Under the excitation of 250–400 nm, all samples exhibited their characteristic emissions of Sr3AlO4F:Tb3+ (5D3 → 7F5, blue and 5D4 → 7F5, green), Sr3AlO4F:Sm3+ (4G5/2 → 6H7/2, red). The concentration dependent luminescence intensity of Sr3AlO4F:A (A = Tb3+, Sm3+) phosphors have been investigated in detail. Besides, the energy transfer from Tb3+ to Sm3+ ion has been researched in the Sr3AlO4F host, and the energy transfer mechanism was demonstrated to be a resonant type, through a dipole–quadrupole mechanism on the basis of experimental and theoretical analysis. In addition, white/tunable light can be prepared by changed the doping concentration of Sm3+ from 0.03 to 0.12 mol in Sr3AlO4F:0.5 % Tb3+ under excitation of deep-UV. It is the first time to produce white light emission through Tb3+ and Sm3+ co-doped Sr3AlO4F phosphor.