Abstract
Excitation and emission spectra ofPb2+ ionsin Ca10−xPbx(PO4)6Cl2 (0≤x≤10) compounds are investigated for various activator concentrations at differenttemperatures. A calcium–lead chlorapatite system shows a common apatiticstructure and occurs as a continuous solid solution. An attempt to identifythe pure electronic transitions between the ground and the excited levels ofPb2+ is made. As a consequence of the two different sites in the apatite, two emission bands dueto the (at room temperature) and (at low temperature) transitions of thePb2+ ions are observed.Decay times of Pb2+ emission have been measured. Experimental data point out thermalization between3P1 and 3P0 levels, for example, at very low temperature, the forbidden transition is the most intense. The overlap between the emission band of one site and theexcitation band of the other site corresponds to an energy transfer phenomenon.Correlations between the luminescence results and the structural data are discussed.
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