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Correlation between ionic charge and the optical properties of zinc blende and complex crystal structured solids

An overview of the understanding of correlation between ionic charge and the optical properties of zinc blende and chalcopyrite crystal structured solids is presented here. We have presented three expressions relating the refractive index (n), energy gap (Eg) and optical electronegativity (Δχ) for the transition metal chalcogenides and pnictides (AIIBVI and AIIIBV) and chalcopyrites (AIBIIIC2VI and AIIBIVC2V) with the product of ionic charges and nearest neighbor distance d (Å). The refractive index (n), energy gap (Eg) and optical electronegativity (Δχ) of these solids exhibit a linear relationship when plotted on a log–log scale against the nearest neighbour distance d (Å), but fall on different straight lines according to the ionic charge product of the compounds. We have applied the proposed relation on these solids and found a better agreement with the experimental data as compared to the values evaluated by earlier researchers. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)