申请人:NIPPON KAYAKU KABUSHIKI KAISHA
公开号:EP1806605A1
公开(公告)日:2007-07-11
An optical filter, which is capable of cutting-off unnecessary near infrared rays, neon light or the like, and preventing reflection of fluorescent light or the like, in plasma display panels and the like, at the same time, superior in transmittance for visible light, and also superior in heat resistance, moisture resistance, and the like of the coloring matter contained, had been desired. The present invention was made to solve such problems. The present invention relates to an optical filter comprising a salt of a cation of a cyanine coloring matter with a di(halogenoalkylsulfonyl)imide anion, preferably a cyanine compound represented by the following formula:
(wherein, in the above formula (1), each of Q and Q' independently represents a benzene ring or a naphthalene ring which may have a substituent; each of R and R' independently represents an alkyl group or an alkoxyalkyl group; and L represents a linking group to form a carbocyanine), and useful as a filter for cutting-off near infrared rays, improving image characteristics for displays or the like.
人们一直希望有一种光学滤光片,它能够在等离子显示面板等设备中切断不必要的近红外线、霓虹灯或类似光,并防止荧光灯或类似光的反射,同时对可见光的透射率更高,所含着色物质的耐热性、防潮性等也更出色。本发明就是为了解决这些问题而提出的。本发明涉及一种光学滤光片,它包含氰基着色物质阳离子与二(卤代烷基磺酰基)亚胺阴离子的盐,最好是由下式表示的氰基化合物:
(其中,在上式(1)中,Q 和 Q'各自独立地代表一个苯环或一个可具有取代基的萘环;R 和 R'各自独立地代表一个烷基或一个烷氧基烷基;以及 L 代表一个连接基团以形成一个碳菁),可用作滤光片,用于切断近红外线、改善显示器的图像特性或类似用途。