Dichroic and spectral properties of anthraquinone-based azo dyes for PVA polarizing film

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摘要：

Dichroic dyes with broad absorption bands are advantageous for the production of neutral gray polarizing films. For this purpose, anthraquinone-based azo dyes were synthesized to have a conjugated bichromophore design and this was applied to PVA polarizing films. The spectral and dichroic properties of the polarizing films were examined and compared to the films produced with a general disazo dichroic dye. The polarizing films with anthraquinone-based azo dyes had wider absorption bands, but lower dichroic ratios compared to the films with a general disazo dichroic dye. It was found that the alignment between the transition moments of the anthraquinone and azo chromophores is an important factor for the dichroic properties of anthraquinone-based azo dyes.

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关键词：

Practical/ dichroism dyes optical films optical polarisers optical polymers ultraviolet spectra visible spectra/ spectral property anthraquinone-based azo dyes PVA polarizing film dichroic dyes absorption band neutral gray polarizing film production conjugated bichromophore design azo chromophore/ A4270J Optical polymers and other organic optical materials A4280B Spatial filters, zone plates, and polarizers A7840H Visible and ultraviolet spectra of other nonmetals A4280X Optical coatings A7865T Optical properties of organic compounds and polymers (thin films/low-dimensional structures) B4110 Optical materials