An organic light emitting device comprising a first electrode, a second electrode provided to face the first electrode, and a light emitting layer provided between the first electrode and the second electrode and including a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, the organic light emitting device which exhibits low driving voltage, high emission efficiency, and long lifespan characteristics.

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The present invention provides for water-soluble mono- and dicationic fluorescent dyes with the latter exhibiting stable fluorescence at elevated temperatures. The present invention also provides for methods for the production of the fluorescent dyes and for using these dyes in biological assays such as multiplexing qPCR and tissue staining.

The present invention provides for water-soluble mono- and dicationic fluorescent dyes with the latter exhibiting stable fluorescence at elevated temperatures. The present invention also provides for methods for the production of the fluorescent dyes and for using these dyes in biological assays such as multiplexing qPCR and tissue staining.

An organic electroluminescence device includes: an anode; a cathode; and an emitting layer provided between the anode and the cathode, in which the emitting layer contains a delayed fluorescent compound M2 and a compound M3 represented by a formula (3) and a singlet energy S.sub.1(M2) of the compound M2 and a singlet energy S.sub.1(M3) of the compound M3 satisfy a relationship of a numerical formula (Numerical Formula 1) below, S.sub.1(M3)>S.sub.1(M2) . . . (Numerical Formula 1). In the formula (3), A3 is a group represented by a formula (3a) or the like.

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A compound represented by the following general formula has excellent light-emitting characteristics and emits light at a short wavelength. Y.sup.1 is N—R.sup.A; Y.sup.2 is O, S, C═O or N—R.sup.A; R.sup.A is an aryl group, etc.; R.sup.1 to R.sup.11 each are a hydrogen atom or a substituent; at least one of R.sup.1 to R.sup.3 is a carbazolyl group substituted with an aryl group, etc.

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A compound represented by the following general formula has excellent light-emitting characteristics and emits light at a short wavelength. Y.sup.1 is N—R.sup.A; Y.sup.2 is O, S, C═O or N—R.sup.A; R.sup.A is an aryl group, etc.; R.sup.1 to R.sup.11 each are a hydrogen atom or a substituent; at least one of R.sup.1 to R.sup.3 is a carbazolyl group substituted with an aryl group, etc.

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Disclosed is an organometallic compound represented by a following Chemical Formula 1. When the organometallic compound is used as dopant of a light-emitting layer of an organic electroluminescent device, rigidity is imparted to the organometallic compound molecule such that a full width at half maximum (FWHM) is narrow and thus color purity is improved. Further, a non-luminescent recombination process is reduced such that luminous efficiency and lifespan of the organic electroluminescent device are improved. Chemical Formula 1 is shown below:

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A composition including a first compound represented by Formula 1 and a second compound represented by Formula 2:

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wherein in Formula 1, M.sub.1 is Pt, Pd, or Au, in Formula 2, M.sub.2 is Ir, L.sub.11 is a ligand represented by Formula 2-1, L.sub.12 is a ligand represented by Formula 2-2, L.sub.13 is a ligand represented by Formula 2-1 or 2-2, L.sub.11 and L.sub.12 are different from each other, n11, n12, and n13 are each independently 0, 1, 2, or 3, and a sum of n11+n12+n13 is equal to 3, and wherein the remaining substituent groups are each understood by referring to the detailed description provided herein.

A composition including a first compound represented by Formula 1 and a second compound represented by Formula 2:

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wherein in Formula 1, M.sub.1 is Pt, Pd, or Au, in Formula 2, M.sub.2 is Ir, L.sub.11 is a ligand represented by Formula 2-1, L.sub.12 is a ligand represented by Formula 2-2, L.sub.13 is a ligand represented by Formula 2-1 or 2-2, L.sub.11 and L.sub.12 are different from each other, n11, n12, and n13 are each independently 0, 1, 2, or 3, and a sum of n11+n12+n13 is equal to 3, and wherein the remaining substituent groups are each understood by referring to the detailed description provided herein.

An organometallic compound represented by Formula 1 emits deep blue light. A light-emitting device including the organometallic compound, and an electronic apparatus including the light-emitting device may have excellent or suitable driving voltage, luminescence efficiency, color conversion efficiency, and/or lifespan characteristics:

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In Formula 1, X.sub.1 to X.sub.4 are each independently C or N, Y.sub.11 is C(Z.sub.11) or N, and Y.sub.12 is C(Z.sub.12) or N.