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LUMINESCENCE PROPERTIES OF PHOSPHORS WITH Ce~(3+) ION

Hong Guangyan Li Youmo (Changchun Institute of Applied Chemistry,Academia Sinica)  
Ce3+ ion has a 4f configuration.The ground state consists of doublet 2F5/2 and 2F7/2. The lower excited states are the crystal-field components of the 5d configuration.Ce3+ emission is due to a 5d-4f transition. Usually the emission consists of a broad band with two peaks in the long-wavelength ultraviolet region.The 5d-4f transition is an allowed electric dipole transition and therefore the decay time of the fluorescence is very short (10-7sec).In a number of cases the 5d level varies strongly with host lattice.The position of Ce3 + emission bands can be in the region from ultraviolet to visible.The position of Ce3+ emission bands has something to do with elec-tronegativity of ligands which is directly coordinated with Ce3+ ion.As the electronegativity of the ligand (F.O.S) decreases, it moves to long wavelength.The position of Ce3+emission bands in several host lattices are related to the crystal-field splitting, the cation, the indirect coordinated ligand which is in negatively charged ion group etc.The energy transfer and sensitization of Ce3 + ion have been described. These results will provide the basis for material design.
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