On the Factors Governing the Refractive Indices of Inorganic Materials
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On the Factors Governing the Refractive Indices of Inorganic Materials Xavier Rocquefelte1, Fabrice Goubin1, Stéphane Jobic1, Myung-Hwan Whangbo2 1 Institut des Matériaux Jean Rouxel, Boîte Postale 32229, 44322 NANTES Cedex 3, France 2 Department of Chemistry, North Carolina State University, Raleigh, North Carolina 276958204 ABSTRACT Three key factors influencing the refractive indices of inorganic solid state materials were discussed on the basis of the concept of optical channels and the dielectric functions calculated for two series of closely related oxides. Implications of our observation concerning efficient UV blockers were discussed.
INTRODUCTION The development of a new class of inorganic materials is of prime importance in our search for efficient UV blockers, which limit the extent of UV damage to human tissues and synthetic and/or naturally occurring polymer materials [1]. The properties required for UV absorbers are that (a) the absorption must be complete (high extinction coefficient, i.e., k > 1) in the UVA and UVB regions (400-280 nm, 3.10-4.43 eV), (b) the light scattering should be restricted in the visible region for aesthetic reasons (low refractive index, i.e., n
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