An organic light-emitting device including a first electrode, a second electrode, an emission layer disposed between the first electrode and the second electrode, a hole transport region disposed between the first electrode and the emission layer, and an electron transport region disposed between the emission layer and the second electrode, wherein the emission layer includes a host and a dopant, wherein the dopant is an iridium-free organometallic compound, and wherein a dopant concentration profile of the emission layer satisfies predetermined parameters disclosed in the specification.

The present invention provides a novel compound capable of improving the luminous efficiency, stability and lifespan of a device, an organic electronic element using the same, and an electronic device thereof, wherein the compound is represented by Formula (1): ##STR00001## wherein: A is a substituent represented by Formula (A-1)-(A-2); ##STR00002##

The present disclosure relates to a plurality of host materials comprising a first host material including a compound represented by formula 1 and a second host material including a compound represented by formula 2, and an organic electroluminescent device comprising the same. In addition, the present disclosure relates to an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound and/or a specific combination of compounds according to the present disclosure as host materials, an organic electroluminescent device having high luminous efficiency and long lifespan property can be provided.

The present disclosure relates to a plurality of host materials and an organic electroluminescent device comprising the same. By comprising the specific combination of compounds according to the present disclosure as a plurality of host materials according to the present disclosure, it is possible to provide an organic electroluminescent device having improved driving voltage, luminous efficiency, and/or lifetime property compared to the conventional organic electroluminescent devices.

Provided are a polycyclic compound represented by Formula 1, an organic light-emitting device including the polycyclic compound, and an electronic apparatus including the organic light-emitting device:

##STR00001##

Formula 1 may be understood by referring to the description of Formula 1 provided herein.

A compound including a first ligand L.sub.A of Formula I ##STR00001##
is disclosed. In the structure of Formula I, one of L.sup.1 and L.sup.2 is C, and the other is N; Y.sup.1 to Y.sup.14 are each C or N; at least two adjacent Y.sup.7, Y.sup.8, Y.sup.9, and Y.sup.10 are carbon atoms that are fused to a structure of Formula II ##STR00002##
Z.sup.1 and Z.sup.2 are each O, S, Se, NR, CRR′, or SiRR′; and each R, R′, R.sup.A, R.sup.B, R.sup.C, and R.sup.D is hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by L.sup.1 and L.sup.2, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

An organic light-emitting device and a preparation method therefor, a display panel, and a display device. The organic light-emitting device comprises an anode layer, a cathode layer, and a first light-emitting layer and an auxiliary light-emitting layer disposed between the anode layer and the cathode layer; the auxiliary light-emitting layer is located between the first light-emitting layer and the cathode layer; the first light-emitting layer comprises a first host material, a first thermally activated delayed fluorescence material, and a first fluorescence guest material; the auxiliary light-emitting layer comprises at least a second host material and a second thermally activated delayed fluorescence material. The first light-emitting layer is a super-fluorescence system, and the auxiliary light-emitting layer also forms a super-fluorescence system together with the first fluorescence guest material.

The present specification provides a heterocyclic compound represented by Chemical Formula 1, an organic light emitting device comprising the same, a composition for an organic material layer of an organic light emitting device, and a method for manufacturing an organic light emitting device.

To provide an organic electroluminescent device realizing high efficiency and low voltage characteristics. A light-emitting layer including compounds of (1) and (2) and a dopant is included. X represents N or CR.sup.3, wherein at least one X represents N. R.sup.1 represents (1b), R.sup.2 represents (1c), and R.sup.3 represents an alkyl group or the like. Y represents O, S, NR.sup.4, or CR.sup.5R.sup.6, R.sup.4 to R.sup.6 each represent an alkyl group or the like, and one of R.sup.7 to R.sup.14 binds to a ring in (1). * represents a binding position to a ring in (1), and rings C and D are each an aromatic ring fused to an adjacent ring. R.sup.15, R.sup.16 and R.sup.17 have the same meaning as R.sup.3 (a and b represent the number of substitutions). R.sup.19 has the same meaning as R.sup.4, and R.sup.20 to R.sup.27 each represent CR.sup.3, CR.sup.28 or N and at least one thereof represents CR.sup.28, and R.sup.28 represents formula (2b). Z represents O, S, NR.sup.37, or CR.sup.38R.sup.39, R.sup.37 to R.sup.39 each has the same meaning as R.sup.4, and one of R.sup.29 to R.sup.36 binds to a ring in (2) and the others represent CR.sup.3 or N.

The invention relates to heteroaromatic compounds, particularly for use in electronic devices. The invention further relates to a method for producing the compounds according to the invention and to electronic devices containing same.