Abstract
The theory of localized activator systems in ionic phosphors is reviewed. The monovalent thallium and divalent manganese activator systems are treated quantitatively in detail. The importance of the nonspherical symmetry of the electron distribution of excited Tl+ and Mn2+ is emphasized. The excitation and emission spectra are evaluated both classically and quantum mechanically from the energies of the accessible atomic configurations of the activator system in the ground and emitting states, respectively. The origin of the fine structure of emission of the tetravalent manganese activator systems is discussed. Modifications in the theory are proposed for covalent luminescent solids such as the zinc sulphide phosphors.
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