Provided is a fluorescent compound for labeling a biomaterial having the following Chemical Formula 1:

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In Chemical Formula 1 above, X1 and X2 are the same as or different from each other, and each independently selected from H, —SO.sub.3.sup.− and SO.sub.3H, R.sub.1 and R.sub.2 are the same as each other or each independently selected from C.sub.1-7 alkyl, C.sub.8-18 alkyl, —(CH.sub.2).sub.mSO.sub.3.sup.−, —(CH.sub.2).sub.mSO.sub.3H, and

##STR00002## R.sub.3 and R.sub.4 are the same as or different from each other and each independently selected from C.sub.1-7 alkyl, —(CH.sub.2).sub.mCOOZ and

##STR00003## R.sub.3 and R.sub.4 are simultaneously not any one selected from —(CH.sub.2).sub.mCOOZ and

##STR00004##

An organic compound represented by general formula (1) is a novel organic compound having an absorption band in the near infrared region, and is useful for infrared absorbing dyes, optical films, and organic electronic devices such as photoelectric conversion elements, wherein R.sup.1 to R.sup.18 each independently represent a hydrogen atom, an aryl group, a heteroaryl group, an alkyl group, a cycloalkyl group, a halogen atom, a hydroxy group, an alkoxy group, a mercapto group, an alkylthio group, a nitro group, a substituted amino group, an amide group, an acyl group, a carboxyl group, an acyloxy group, a cyano group, a sulfo group, a sulfamoyl group, an alkylsulfamoyl group, a carbamoyl group, or an alkylcarbamoyl group; and X represents a substituted or unsubstituted methine group, a silylidyne group, a germylidyne group, a stannylidyne group, a nitrogen atom, a phosphorus atom, an arsenic atom, or an antimony atom. ##STR00001##

A composition for a near-infrared light-absorbing film includes a binder and compounds represented by separate particular chemical formulae. A near-infrared light-absorbing film may include a near-infrared light-absorbing layer including a cured product of the composition. A camera device may include the near-infrared light-absorbing film, and an electronic device may include the camera device.

Provided is a pressure sensitive adhesive sheet having excellent light resistance (particularly, excellent light resistance for light having a wavelength of 370 to 400 nm), a laminate, a display device, and an organic EL display device. The pressure sensitive adhesive sheet includes a (meth)acrylic pressure sensitive adhesive and a compound represented by Formula (I), in which the (meth)acrylic pressure sensitive adhesive is formed of a (meth)acrylic resin, and an absolute value of a difference between a log P value of the (meth)acrylic resin and a log P value of the compound represented by Formula (I) is 2.50 or more.

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An object of the present invention is to provide an optical filter having excellent visible light-cut characteristics and near-infrared rays transmission properties at a specific wavelength that are compatible with one another even in the case where the incident angle is increased, according to reduction in height of equipment on which an optical sensor device is provided. The optical filter of the present invention includes a base material (i) including a resin layer containing a compound (Z) having an absorption maximum in the wavelength region of 700 to 930 nm, and a dielectric multilayer film formed on at least one surface of the base material (i), and has specific optical properties.

The present invention disclosed a squaraine dye of formula (I) and process for the preparation thereof. Further, the present invention disclosed to an electronic device comprising dye of formula (I).

The purpose of the present invention is to provide: a high-performance polarizing plate which functions for light in an infrared wavelength range; and a liquid-crystal display device or the like comprising the same. Provided is a polarizing plate for an infrared range, which is a stretched film containing a dye exhibiting absorption in an infrared range, the film exhibiting dichroism.

The purpose of the present invention is to provide: a high-performance polarizing plate which functions for light in an infrared wavelength range; and a liquid-crystal display device or the like comprising the same. Provided is a polarizing plate for an infrared range, which is a stretched film containing a dye exhibiting absorption in an infrared range, the film exhibiting dichroism.

Provided are a filter capable of detecting light with less noise, an optical sensor, a solid-state imaging element, and an image display device. This filter is provided with a plurality of different pixels that are two-dimensionally arranged, and at least one of the plurality of pixels is a pixel 11 of a near-infrared cut filter that shields at least a part of light having a wavelength in the near-infrared region and transmits light having a wavelength in the visible region.

An object of the present invention is to provide a luminescent particle having an emission maximum wavelength in a long wavelength range of 680 nm or longer and exhibiting a high quantum yield; and a compound having an emission maximum wavelength in a long wavelength range of 680 nm or longer and exhibiting a high quantum yield in the particles. According to the present invention, provided is a luminescent particle containing at least one kind of compound represented by Formula (1) (definitions of substituents in the formula are as set forth in the description) and a particle. ##STR00001##