Provided is an organic light-emitting device including a light-emitting layer comprising a compound of Chemical Formula 1, and a first organic material layer comprising a compound of Chemical Formula 2:

##STR00001## wherein: Cy1 to Cy5 are each independently one selected from the group consisting of a substituted or unsubstituted: aromatic hydrocarbon ring, aliphatic hydrocarbon ring, and an aromatic hetero ring, or a ring in which two or more rings selected from the above group are fused, one or more of Cy1 to Cy5 are a ring of the following Chemical Formula 1-A,

##STR00002##

wherein: Ar1 and Ar2 are the same as or different from each other, and are each independently a phenyl, a biphenyl, a terphenyl, a naphthyl, a phenanthrenyl, or a triphenylenyl, where the naphthyl, phenanthrenyl, and triphenylenyl can be substituted with a phenyl.

A light emitting diode of one or more embodiments includes a first electrode, a second electrode opposite the first electrode, and at least one functional layer disposed between the first electrode and the second electrode, the at least one functional layer including a polycyclic compound represented by Formula 1 below, wherein the first electrode and the second electrode each independently includes at least one selected from among Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, Zn, compounds thereof, and mixtures thereof.

##STR00001##

A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode, wherein the interlayer includes an emission layer, and the emission layer includes a first compound of Formula 1-1 or Formula 1-2 and a second compound of Formula 2, as described herein.

An organic light-emitting device having improved efficiency and lifespan includes: a first electrode, a second electrode, and an organic layer between the first electrode and the second electrode, wherein the organic layer includes an emission layer, the emission layer includes a first compound, a second compound, a third compound, and a fourth compound, the first compound, the second compound, the third compound, and the fourth compound are different from each other, the third compound includes a metal element having an atomic number of 40 or more, the fourth compound includes boron (B), the third compound and the fourth compound each satisfy Conditions 1-1 and 1-2 below, and the fourth compound satisfies Condition 2 or 3:
T.sub.1(C3).sub.onset≥S.sub.1(C4).sub.onset  Condition 1-1
T.sub.1(C3).sub.max≥S.sub.1(C4).sub.max  Condition 1-2
K.sub.RISC(C4)≥10.sup.3S.sup.−1  Condition 2
f(C4)≥0.1.  Condition 3

An organic compound having a tetraphenyl moiety and at least one fused hetero aryl moiety having at least one oxygen and/or sulfur on a ring and bonded to the tetraphenyl moiety directly or indirectly, and a light emitting diode and a light emitting device having the organic compound are disclosed. The organic compound has excellent thermal resistance property and hole mobility property. The organic compound can be incorporated into a hole transfer layer, an electron blocking layer and/or a charge generation layer of the light emitting diode. Therefore, the light emitting diode and light emitting device according to the present invention have decreased driving voltage and enhanced luminous efficiency.

An organic electroluminescence device includes an emitting region provided between an anode and a cathode, in which the emitting region includes a first emitting layer and a second emitting layer, a ratio D.sub.EM1/D.sub.EM2 of a film thickness of the first emitting layer D.sub.EM1 to a film thickness of the second emitting layer D.sub.EM2 is in a range from 2/3 to 3/2, the first emitting layer contains a first host material and a first emitting compound, the second emitting layer contains a second host material and a second emitting compound, and the first host material has a group represented by a formula (10) below and is a compound represented by a formula (1) below. ##STR00001##

To provide a light-emitting element having high luminous efficiency and to provide a light-emitting device and an electronic device which consumes low power and is driven at low voltage, a carbazole derivative represented by the general formula (1) is provided. In the formula, α.sup.1, α.sup.2, α.sup.3, and α.sup.4 each represent an arylene group having less than or equal to 13 carbon atoms; Ar.sup.1 and Ar.sup.2 each represent an aryl group having less than or equal to 13 carbon atoms; R.sup.1 represents any of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group; and R.sup.2 represents any of an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted phenyl group, and a substituted or unsubstituted biphenyl group. In addition, l, m, and n are each independently 0 or 1.

The present specification relates to a compound represented by Chemical Formula 1, a photoresist fluorescent resin composition including the same, and a color conversion film manufactured using the same, a backlight unit and a display apparatus.

The present specification relates to a polymer comprising a unit represented by Chemical Formula 1, a monomer represented by Chemical Formula 2, a coating composition comprising the same, an organic light emitting device formed using the same, and a method for manufacturing an organic light emitting device using the same:

##STR00001##

wherein the variables are described herein.

The present application provides a heterocyclic compound capable of significantly enhancing lifetime, efficiency, electrochemical stability and thermal stability of an organic light emitting device, and an organic light emitting device including the heterocyclic compound in an organic material layer.