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Values of E 0 , the lowest direct optical transition, are available for several III-V alloy systems, from measurements of optical absorption, electroreflectance, electroluminescence, etc. It is shown that in all available cases the variation of E 0 with composition can be fitted very well to an equation of the form E 0 = A + Bx + Cx 2 , where x is the mole fraction of one component compound. Such a relation is expected from a virtual-crystal type of analysis.If E 0m is the mean of the energy gaps of the component compounds of the system, it is found that an empirical relation of the form Formula: see text appears to hold where α is approximately 0.3 eV 3/2 .
Thompson et al. (Wed,) studied this question.
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