PDP 패널용 하이브리드 및 전도막 광학필터 제조에 관한 연구

Abstract

The functional dyes, which has various optical characteristics that can be applicable to field of electronic, photo electronic, such as sensor or electrode, were synthesized. Physical property and optical stability was studied with preparation of hybrid type and conductive type film as a kind of optical filter of plasma panel, by adapting neon cut off dye, which can selectively absorbing between 580 and 610nm wavelength, and near infrared absorbing dye which can (selectively) absorbs between 780 and 1,100nm wavelength. The filters were prepared with PMMA resin, which is organized chemically stable structure. The PSA resin, which has functional group of -COOH and -OH, as binder. And the characters such as spectroscopy, heat-proof / wet-proof, thermal stability and commerciality, which must be held by functional dyes, were examined. 1. Absorption characteristics of near infrared absorbing dyes. In this study, diimonium dyes were synthesized for preparation of near-infrared absorbing colorants for plasma display panel. And in cases of the diimonium dyes, it is ascertained that UV/VIS/NIR absorption spectrum of organic acid, as compared to that of inorganic anion, is moves to long wavelength by examining with three kinds of salts, such as SbF_(6)^(-), as inorganic anion, and (CF₃SO₂)₂N^(-), (CN)₂NO₂C^(-), as organic acid. Furthermore, the maximum absorption wavelength is wide about 270nm of full width at half maximum(FWHM) near 1100nm wavelength of near infrared absorbing area. All the mole absorption coefficients of dyes are in the level of 110,000 and it can be considered that the dyes are dissolves in organic solvents very easily. In the case of Metal complex dyes, it was ascertained that UV/VIS/NIR absorption spectrum is moves to long wavelength area by increasing the electron donor group in accordance with introducing methoxy substitution group at the dithiol group compounds. The full width at half maximum(FWHM) is between 132 and 160nm, and it is narrower than that of diimonium group dyes and the mole absorption coefficients on an average are in the level of 70,000 and the solubility is inferior to diimonium dyes. 2. Absorption characteristics of neon cut off dyes. Cyanine dyes were synthesized by adapting methyl group, propyl group, isopropyl group, butyl group and 4-(iodomethyl) benzoate group on the -N end-group of indole. The maximum absorption wavelength was found between 586.5 and 593nm and it has very narrow absorption zone with about 40nm of full width at half maximum(FWHM). It shows that this could be used valuably if precise control of wave length and color tuning of display is necessary. Three kind of tetraazaporphyrin with central metal change. The maximum absorption wavelength of Porphyrins are 582, 586 and 590nm, individually and it has neon cut off property, very narrow full width at half maximum(FWHM) (below 25nm) and relatively high mole absorption coefficient, between 130,000 and 200,000. 3. Thermal stability of dyes. For the thermal stability of diimonium dyes, it is observed that the melting point of the dyes introduced inorganic anion, SbF_(6)^(-), is higher (228℃) than that of organic acid, (CF₃SO₂)₂N^(-) (184℃), (CN)₂NO₂C^(-) (166℃). The thermal stability of metal complex dyes is elevated by increasing of attraction between molecules as introducing of methoxy substitution group. For the thermal stability of cyanine dyes, it is observed that the melting point is increased in accordance with chain length in the order of methyl group, propyl group, isopropyl group, butyl group and 4-(iodomethyl)benzoate group at the -N ending group. For the porphyrin dyes, it is observed that the melting point is exceed the DSC measuring capacity (higher than 350℃). It shows that the thermal stability of the dye is high and it can be applied, widely. 4. Heat-proof / wet-proof characteristic of film. Hybrid type film is a kind of optical filter for plasma display panel, and it includes neon cut off dyes and near infrared cut off dyes. As the result of coating on the mesh film with PMMA binder by selecting high durability dyes rationally after durability test for prepared dyes, it is observed that spectrum of before and after the durability test ere not changed due to stability of dyes. Conductive type film is the kind of film includes only neon cut off dyes. For the neon cut off dyes, porphyrin can be applied as a stable dye. And it is observed that spectrum of before and after the durability test are not changed due to stability of dyes, as the result of coating on the mesh film with PSA binder.