A color conversion sheet includes at least a color conversion layer, a color conversion layer, a resin layer, and a base layer, the color conversion layer contains a light-emitting material (a) that exhibits light emission with a peak wavelength observed in a region of 500 nm or more and less than 580 nm, the color conversion layer contains a light-emitting material (b) that exhibits light emission with a peak wavelength observed in a region of 580 nm to 750 nm, a haze value of the color conversion sheet is 20% to 90%, and n.sub.A1, n.sub.A2 and n.sub.B satisfy relationships (1) or (2), where n.sub.A1 is a refractive index of the color conversion layer, n.sub.A2 is a refractive index of the color conversion layer, and n.sub.B is a refractive index of the resin layer:

n.sub.A1>n.sub.B and n.sub.A2>n.sub.B  (1)

n.sub.A1<n.sub.B and n.sub.A2<n.sub.B.  (2)

A compound of a first ligand L.sub.A of Formula I, is provided. In Formula I, moieties A and B are each a monocyclic ring or a polycyclic fused-ring system; Z.sup.1 to Z.sup.4 are each C or N; K is a direct bond, O, or S; each R.sup.A and R.sup.B is independently a hydrogen or a General Substituent; at least one R.sup.A or R.sup.B is R*, wherein R* has a structure of Formula II, —L—GeR.sup.1R.sup.2R.sup.3; L is a direct bond or an organic linker; and L.sub.A is coordinated to a metal M by the dashed lines; and metal M is selected from Ir, Rh, Re, Ru, Os, Pt, Pd, Ag, Au, or Cu.

##STR00001##

Provided are a color conversion composition which contains at least one kind of compound represented by a specific general formula, a compound which is used in the color conversion composition and represented by a specific general formula, and a light emitting device which has a color conversion portion consisting of the color conversion composition and a light source.

Provided are the following compound and a fluorescently labeled biological substance having this fluorescent compound.

##STR00001##

X represents CR.sup.7 or N.

R.sup.1 to R.sup.7, Q.sup.1, and Q.sup.2 represent a hydrogen atom, a halogen atom, a cyano group, or a group represented by Formula (A), and adjacent substituents may form a ring structure.

However, at least one of R.sup.3, R.sup.4, R.sup.7, Q.sup.1, or Q.sup.2 contains, as a hydrophilic group, at least one of a carboxy group or a salt thereof, a sulfo group or a salt thereof, a phosphono group or a salt thereof, an onio group, or a polyamino acid residue, where at least one of Q.sup.1 or Q.sup.2 represents an alkyl group.

A pyrromethene-boron complex in one aspect of the present invention is a compound with a molecular weight of 1000 or more, represented by the following general formula (1), in which at least two of R.sup.1 to R.sup.6 are groups represented by the following general formula (2),

[Chem 1]

##STR00001##

and in the general formula (1), X is C—R.sup.7 or N; R.sup.1 to R.sup.9, other than the groups represented by the following general formula (2), each are the same or different, and selected from the candidate group consisting of alkyl and other groups;

[Chem 2]

.circle-solid.-L.sup.1L.sup.2R.sup.101).sub.n).sub.m)  (2)

and in the general formula (2), L.sup.1 is selected from the candidate group consisting of oxygen and other groups; L.sup.2 is, for example, alkylene; when L.sup.2 is alkylene, the carbon atom bound to L.sup.1, in the alkylene group, is secondary or tertiary carbon; R.sup.101 is, for example, cyano; n is an integer of 0 to 5; m is an integer of 1 to 5; and m-(L.sup.2-(R.sup.101).sub.n) each comprises three or more ring structures.

A low dimerizing electrochromic compound for use in electrochromic mediums and electro-optic elements incorporating said electrochromic mediums is provided. The low dimerizing electrochromic compound is represented by Formula (I): ##STR00001##
wherein each R.sub.1 is individually an alkyl, a hydroxyalkyl, or an alkyl substituted with at least one polymerizable functional group; each R.sub.2 is a hydrogen; each R.sub.3 is individually a hydrogen or an alkyl; and each R.sub.4 is individually a hydrogen, an alkyl, or a hydroxyalkyl; and X.sup.− is an anion.

A compound of Formula I,

##STR00001##

or Formula II,

##STR00002##

is provided. In Formulae I and II, M is Pt or Pd; each R.sup.A, R.sup.A′, R.sup.A″, R.sup.B, R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 is hydrogen or one of the General Substituents; R.sup.1′ is one of the General Substituents; at least one of R.sup.A′, R.sup.A″, and R.sup.B is not hydrogen; any two of R.sup.A, R.sup.A′, R.sup.A″, R.sup.B, R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 may be joined or fused together to form a ring; and R.sup.A′, R.sup.A″, and R.sup.B together comprise at least one heterocyclic group or at least two carbocyclic groups; with the proviso that at least one of R.sup.A′ and R.sup.A″ comprises a cyclic group when R.sup.B is one of five specific moieties.

The invention described in the present specification relates to a color conversion film including a resin matrix; and an organic fluorescent substance dispersed in the resin matrix, and absorbing blue or green light and emitting light having a wavelength different from the absorbing light, wherein the resin matrix includes a thermoplastic resin, and the color conversion film has a light emission peak with a FWHM of 60 nm or less, quantum efficiency of 80% or greater and an absorption coefficient of 30,000 M.sup.−1cm.sup.−1 or greater at a maximum absorption wavelength when irradiating light having a light emission peak at 450 nm, a FWHM of 40 nm or less and monomodal light emission intensity distribution, a method for preparing the same, and a backlight unit including the color conversion film.

Provided are an organometallic compound represented by Formula 1, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound:

M.sub.1(L.sub.11).sub.n11(L.sub.12).sub.n12   Formula 1

wherein L.sub.11 in Formula 1 is a ligand represented by Formula 1-1:

##STR00001##

wherein, in Formula 1-1, Ar.sub.1 is a phenyl group substituted with at least one of E.sub.1 and Ar.sub.2 is a phenyl group substituted with at least one E.sub.2, and the other substituents are described in the detailed description of the present specification.

Provided are organometallic compounds including a ligand L.sub.A of

##STR00001##

Also provided are formulations including these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.