Oxide evaporation material and high-refractive-index transparent film

• Main Authors: MAENO YASUYUKI, KUWAHARA MASAKAZU, ABE YOSHIYUKI, WAKE RIICHIRO
• Format: Patent
• Language: English
• Published: 01.01.2013
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CABLES; CEMENTS; CERAMICS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; CONDUCTORS; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTRICITY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INSULATORS; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; SLAG; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF NATURAL STONE

An oxide evaporation material in the present invention comprises a sintered body containing indium oxide as a main component thereof and cerium with the Ce/In atomic ratio of more than 0.110 and equal to or less than 0.538, and has an L* value of 62 to 95 in the CIE 1976 color space. The oxide evaporation material with the L* value of 62 to 95 has an optimal oxygen amount. Accordingly, even when a small amount of oxygen gas is introduced into a film-formation vacuum chamber, a high-refractive-index transparent film having a refractive index of 2.15 to 2.51 at a wavelength of 550 nm, a low resistance, and a high transmittance in the visible to near-infrared region is formed by vacuum deposition methods. Since the introduced oxygen gas amount is small, the difference in composition between the film and the evaporation material is made small.