The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent device having a low driving voltage and/or a high luminous efficiency and/or a long lifespan can be provided, by comprising an organic electroluminescent compound according to the present disclosure.

Disclosed is an organic light emitting diode (OLED) includes a first emitting material layer, which includes a first compound and a second compound, and a second emitting material layer, which includes a third compound and a fourth compound, wherein a HOMO energy level of the first compound is higher than a HOMO energy level of the second compound and a HOMO energy level of the third compound is lower than a HOMO energy level of the fourth compound, and an organic light emitting device having the OLED. The OLED and the organic light emitting device disclosed have enhanced luminous efficiency, color purity and luminous life span as well as low driving voltage by applying the emitting material layer.

The present disclosure relates to compounds of Formula (I) as useful materials for OLED's. X is O or S; Y.sup.1 to Y.sup.4 are N or R—C; at least one of R and R.sup.5 to R.sup.8 is CN or heteroaryl; and at least other one of R and R.sup.5 to R.sup.8 is diarylamino. ##STR00001##

The present disclosure provides a nitrogen-containing compound, an organic electroluminescent device and an electronic apparatus, belonging to the technical field of organic materials. The nitrogen-containing compound of the present disclosure has a carbazole structure and a fluorenyl group, two cooperating with each other and has a high first triplet energy level. Therefore, the nitrogen-containing compound of the present disclosure is suitable for use as a host material of a light-emitting in an organic electroluminescent device. The nitrogen-containing compound can improve the performance of the organic electroluminescent device.

The present specification relates to a heterocyclic compound represented by Chemical Formula 1, and an organic light emitting device including the same.

Provided are an organic electric element having a first electrode, a second electrode, and at least an organic material layer formed between the first electrode and the second electrode, the organic material layer comprising an emitting layer and the emitting layer comprising a mixture of host materials which improves luminous efficiency, stability, and lifespan of the element; and an organic electronic device comprising the element.

Provided is an organic light-emitting device comprising an anode, a cathode, and a light-emitting layer provided between the anode and the cathode, wherein the light-emitting layer comprises a first compound of Chemical Formula 1 and a second compound of Chemical Formula 2: ##STR00001## wherein: A is Chemical Formula 1a or 1b: ##STR00002## Ar.sub.1 and Ar.sub.2 are each independently a C.sub.6-60 aromatic ring or a C.sub.2-60 heteroaromatic ring, and Ar.sub.1 and Ar.sub.2 are unsubstituted, or substituted with C.sub.1-60 alkyl, C.sub.6-60 aryl, or C.sub.2-60 heteroaryl; Ar′.sub.1 and Ar′.sub.2 are each independently substituted or unsubstituted C.sub.6-60 aryl or substituted or unsubstituted C.sub.2-60 heteroaryl; provided that a1+b1+c1+d+e+f is 1 or more; or a2+b2+c2+d+e+f is 1 or more; R′.sub.1 and R′.sub.2 are each independently hydrogen, deuterium, C.sub.1-60 alkyl, C.sub.6-60 aryl, or C.sub.2-60 heteroaryl; and r and s are each independently 0 to 7.

Irridium complexes with molecular formula of L.sub.3Ir, together with application thereof and organic electroluminescent devices, wherein Ir is the central metal atom and L is a ligand. The structure of these complexes is of the following formula (I): ##STR00001## Ar is selected from substituted or unsubstituted aryl groups with 6 to 30 carbon atoms, and substituted or unsubstituted heterocyclic aryl groups with 4 to 30 carbon atoms. R1 to R7 are each independently selected from atoms or groups described herein. The substituent group on above-mentioned Ar or R1 to R7 is independently selected from F, Cl, Br, I, CHO, CN, substituted or unsubstituted alkyl or cycloalkyl groups with 1 to 30 carbon atoms, fluoroalkyl groups, alkoxy groups, and thioalkoxy groups.

The present disclosure relates to a compound represented by Formula 1 and an organic light emitting device using the same. The compound used as a material of an organic material layer of the organic light emitting device provides improved efficiency, low driving voltage, and improved lifetime characteristic.

An organometallic compound represented by Formula 1:

##STR00001## wherein, in Formula 1, groups and variables are the same as described in the specification.