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When the activator ions in a phosphor have a charge different from that of any ions in the host lattice, it is generally agreed that charge compensation must take place. A new theory of luminescent centres is proposed in which the compensation of charge, by lattice vacancies or by activator ions, is localized in the vicinity of the activator ions. This theory is primarily applicable to ionic crystals, and specific configurations of lowest energy can be deduced. These configurations are described in detail for alkaline-earth oxide, uranate and fluoride phosphors. and the vibrations of these centres are discussed. A number of original phosphors of theoretical interest, including CaO. Bi, Li; CaO. U, Li; CaO. U, Sm; and the uranates, are described and spectra are shown. Finally, necessary modifications of the present theories of sensitized luminescence and multiple-band emission are considered.
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W. A. Runciman (1955) studied this question.
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