In situ fabrication of blue ceramic coatings on wrought Al Alloy 2024 by plasma electrolytic oxidation J. Vac. Sci. Technol. A 30, 021302 (2012) Influence of substrate temperature and bias voltage on properties of chromium nitride thin films deposited by cylindrical cathodic arc deposition J. Vac. Sci. Technol. A 29, 051515 (2011) Ultrathin TiSiN overcoat protection layer for magnetic media J. Vac. Sci. Technol. A 29, 051502 (2011) High-corrosion-resistant Al2O3 passivation-film formation by selective oxidation on austenitic stainless steel containing Al J. Vac. Sci. Technol. A 29, 021002 (2011) Low-energy ion bombardment to tailor the interfacial and mechanical properties of polycrystalline 3C-silicon carbide J.An optical filter for plasma display panel ͑PDP͒ requires an electromagnetic shield with very high ability. The authors investigated a transparent conductive multilayer coating consisting of silver ͑Ag͒ layers and transparent metal oxide layers. The durability of the multilayer sputter coating, including the silver layer, is very sensitive to the surrounding atmosphere. For example, after an exposure test they found discolored points on the multilayer sputter coatings, possibly caused by migration of silver atoms in the silver layers. In their investigation, they modified the top surface of the multilayer sputter coatings with transition metals to improve the corrosion resistance of the multilayer coating. Specifically, they deposited transition metals 0.5-2 nm thick on the top surface of the multilayer coatings by sputtering. They chose indium tin oxide ͑ITO͒ as the transparent metal oxide. They applied the multilayer sputter coatings of seven layers to a polyethylene terephthalate ͑PET͒ film substrate. A cross-sectional structure of the film with the multilayer coatings is PET film/ITO/Ag/ITO/Ag/ITO/Ag/ITO. They evaluated the corrosion resistance of the films by a salt-water immersion test. In the test, they immersed the film with multilayer coatings into salt water, and then evaluated the appearance, transmittance, and electrical resistance of the multilayer coatings. They investigated several transition metals as the modifying material, and found that titanium and tantalum drastically improved the resistance of the multilayer coatings to the salt-water exposure without a significant decline in transmittance. They also investigated the relation between elapsed time after deposition of the modifying materials and resistance to the salt water. Furthermore, they investigated the effects of a heat treatment and an oxide plasma treatment on resistance to the salt water.
Optical filters for plasma display panels (PDPs) have been studied. We obtained the sputtered seven-layer coatings (comprising alternate layers of silver and indium–tin–oxide) on substrates of polyethylene terephthalate by a roll-to-roll process. The coatings were designed in order to minimize interfacial reflectance between the coatings and the adjacent layer to it. The coatings have a surface resistance of 2.2 Ω/sq, a transmittance of 1%∼12% in the near-infrared region of 800–1200 nm, and visible-light transmittance of approximately 70%. In combination with these multilayer coatings working as shields of electromagnetic wave and near-infrared light, organic dyes were also applied to control transmission properties of the optical filters and to improve PDPs picture quality.
Optical filters with a high shielding capability against electromagnetic (EM) radiation for plasma-display panels (PDPs) have been studied. We developed optical filters with high conductivity by utilizing a copper-mesh layer, which was processed by using roll-to-roll photolithography and rollto-roll etching. The copper-mesh layer has a cross-striped pattern with a surface resistance of 0.05 Ω/ᮀ and an opening ratio of approximately 93%. In combination with the copper-mesh layer, organic dyes were applied to reduce the PDPs unfavorable emissions, such as near-infrared light, and to control the transmission properties to improve the PDPs picture quality.
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