Disclosed are an organic light emitting device including a heterocyclic compound represented by Chemical Formula A and a heterocyclic compound represented by the following Chemical Formula B, a composition for an organic material layer of the organic light emitting device, and a method for manufacturing the organic light emitting device.

The organic light emitting device, the composition for an organic material layer of the organic light emitting device, and the method for manufacturing the organic light emitting device described in the present specification can reduce the driving voltage of the device, improve the light emitting efficiency, and improve the service life characteristics of the device.

A compound of formula Ir(L.sub.A)x(L.sub.B)y(L.sub.C)z, where the a first ligand L.sub.A has a structure of Formula I,

##STR00001##

is provided. In Formula I, moiety A is a monocyclic ring; each of X.sup.1 to X.sup.10 and Z.sup.1 is C or N; K.sup.1 and K.sup.2 are each a direct bond or a linker; each R.sup., R.sup., R.sup.A and R.sup.B is hydrogen or a General Substituent defined herein; L.sub.B and L.sub.C are bidentate ligands; x=1, 2, or 3, y and z are each 0, 1, or 2, and x+y+z=3. Formulations, OLEDs, and consumer products comprising the compound are also provided.

A light-emitting device including a first electrode, a second electrode opposite to (e.g., facing) the first electrode, and an interlayer arranged between the first electrode and the second electrode is provided. The interlayer includes an emission layer having at least a first compound and a second compound. The first compound includes a pentacyclic core with a nearly planar geometry and a hexacyclic peripheral section that is twisted to shield the pentacyclic core and prevent or reduce intermolecular - stacking. The core of the second compound may be a triazine group having bulky substituents that prevent or reduce intermolecular - stacking with the first compound.

A novel organic compound that is highly convenient, useful, or reliable is provided. The organic compound is represented by General Formula (G0).

##STR00001##

In General Formula (G0), X is a nitrogen atom or a carbon atom. When X is a carbon atom, X is bonded to hydrogen or a substituent. One of R104 and R105 is a cyano group. At least one of R102 and R107 is an alkyl group having 1 to 6 carbon atoms. The rest of R101 to R111 are each independently hydrogen or a substituent. The substituents are each independently an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 7 carbon atoms, a substituted or unsubstituted aryl group having 6 to 13 carbon atoms, a substituted or unsubstituted heteroaryl group having 1 to 5 carbon atoms, an amino group, or a hydroxy group. The substituents may be bonded to each other to form a ring. n is an integer greater than or equal to 1 and less than or equal to 3. L is a ligand.

Provided in the present application are an organic light-emitting diode and a display apparatus. The organic light-emitting diode includes at least one light-emitting layer, which includes at least one phosphorescence sensitized light-emitting layer, wherein the phosphorescence sensitized light-emitting layer includes a host material, a phosphorescent sensitizer and a narrow-spectrum fluorescent material, and the full width at half maximum of the narrow-spectrum fluorescent material is less than 50 nm. The present application can improve the performance, such as the efficiency, of an organic light-emitting diode.

Embodiments provide an organometallic compound, and a light-emitting device including the organometallic compound. The 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 and including an emission layer. The interlayer includes the organometallic compound, which is represented by Formula 1 and satisfies Conditions A and B. Formula 1 and Conditions A and B are explained in the specification.

##STR00001##

The disclosure provides a compound having a Formula Ir(L.sub.A).sub.x(L.sub.B).sub.y(Lc).sub.z or Ir(L.sub.A).sub.p(L.sub.B).sub.q(Lc).sub.r, wherein: L.sub.A has a structure of Formula IA

##STR00001## L.sub.A comprising a structure of Formula III:

##STR00002## L.sub.B has a structure of Formula IB:

##STR00003## L.sub.C is a bidentate ligand; and a structure of Formula II,

##STR00004## is fused to at least one of moieties A, B, C, D, or ring H. Formulations, OLEDs, and consumer products containing the same are also provided.

A light-emitting device having an emission layer that includes a hole-transporting host, an electron-transporting host, a sensitizer, and a delayed fluorescence dopant is provided. The hole-transporting host and the electron-transporting host form an exciplex, E.sub.ST indicating an energy gap between E(.sup.1CT) and E(.sup.3CT) of the exciplex is 0.3 eV or more, and a ratio of a delayed fluorescence photoluminescence quantum yield (PLQY) to a PLQY of the exciplex is 20% or less.

The present disclosure relates to an organic light emitting diode including an emission layer including a multifunctional compound.

To provide a light-emitting device having favorable characteristics. The light-emitting device includes first and second electrodes, an intermediate layer therebetween, first and second light-emitting layers, and first and second electron-transport layers. The first light-emitting layer is between the first electrode and the intermediate layer, the second light-emitting layer is between the intermediate layer and the second electrode, the first electron-transport layer is between the first light-emitting layer and the intermediate layer, the second electron-transport layer is between the second light-emitting layer and the second electrode, the second electron-transport layer includes a first organic compound having a triazine skeleton, the intermediate layer includes a second organic compound having a phenanthroline skeleton, the first and second light-emitting layers include the same emission center substance and the same two kinds of organic compounds forming an exciplex, the first light-emitting layer is different from a light-emitting layer of at least one of a plurality of light-emitting devices adjacent to the light-emitting device, and the second light-emitting layer is different from a light-emitting layer of the at least one of the plurality of light-emitting devices adjacent to the light-emitting device.