Single emission bands of luminescent solids generally exhibit a bell-shaped form. Closer examination of emission curves of a simple nature demonstrates a very close Gaussian form, but only when energy is plotted as a function of frequency. More complex emission curves can be very well described as a sum of Gaussian distribution functions. The experimentally determined shape of the emission profile is compared with theoretical emission curves, calculated from the configuration co-ordinate model.
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Chr. C. Vlam (1954) studied this question.
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