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.

An organic electroluminescent device, a display panel, a display device, and a light emitting device are described. The organic electroluminescent device includes an anode, an electron blocking layer, a buffer layer, an organic light emitting layer, and a cathode that are sequentially stacked. The thickness of the buffer layer is in a range from 1 nm to 100 nm. The material of the buffer layer comprises a compound shown in a first chemical formula as below:

##STR00001##

The organic electroluminescence device can improve the life of the device.

Use of transition metal complexes of the formula (I) in organic light-emitting diodes ##STR00001## where: M.sup.1 is a metal atom; carbene is a carbene ligand; L is a monoanionic or dianionic ligand; K is an uncharged monodentate or bidentate ligand selected from the group consisting of phosphines; CO; pyridines; nitriles and conjugated dienes which form a π complex with M.sup.1; n is the number of carbene ligands and is at least 1; m is the number of ligands L, where m can be 0 or ≥1; o is the number of ligands K, where o can be 0 or ≥1; where the sum n+m+o is dependent on the oxidation state and coordination number of the metal atom and on the denticity of the ligands carbene, L and K and also on the charge on the ligands carbene and L, with the proviso that n is at least 1, and also
an OLED comprising these transition metal complexes, a light-emitting layer comprising these transition metal complexes, OLEDs comprising this light-emitting layer, devices comprising an OLED according to the present invention, and specific transition metal complexes comprising atb least two carbene ligands.

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.

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.

A heterocyclic compound and an organic light-emitting device including the same are provided. The heterocyclic compound is represented by Formula 1: ##STR00001## Details of R1, R2, R3, X1, L1, and a1 and b1 are provided in the disclosure.

An organometallic compound represented by Formula 1A: ##STR00001## wherein, in Formula 1A, groups and variables are the same as described in the specification.

The present invention relates to iridium complexes suitable for use in organic electroluminescent devices, especially as emitters.

The present invention relates to compounds that include a nitrogen heteroatom, including a compound of the formula (I). Also provided herein is an organic electronic device comprising the compound and a display device or lighting device comprising the organic electronic device.