An organic light-emitting element which emits delayed fluorescence comprising specifically substituted 1,2,4-triazole derivatives, 1,2,4-oxadiazole derivatives or 1,2,4-thiadiazole derivatives in the light-emitting layer, a light-emitting layer comprising the specifically substituted 1,2,4-triazole derivatives, 1,2,4-oxadiazole derivatives or 1,2,4-thiadiazole derivatives, specific specifically substituted 1,2,4-triazole derivatives, 1,2,4-oxadiazole derivatives and 1,2,4-thiadiazole derivatives and an organic light emitting element comprising the specific 1,2,4-azole derivatives as well as a light emitting layer comprising the specific 1,2,4-azole derivatives; the use of the specifically substituted 1,2,4-triazole derivatives, 1,2,4-oxadiazole derivatives and 1,2,4-thiadiazole derivatives for electrophotographic photoreceptors, photoelectric converters, sensors, dye lasers, solar cell devices and organic light emitting elements, and the use of the specifically substituted 1,2,4-triazole derivatives, 1,2,4-oxadiazole derivatives and 1,2,4-thiadiazole derivatives for generating delayed fluorescence emission.

The present disclosure relates to novel organic electroluminescent compounds and an organic electroluminescent device comprising the same. By using the organic electroluminescent compound of the present disclosure, the organic electroluminescent device may improve driving lifespan while maintaining equal or greater efficiency compared to conventional devices.

Tetradentate ligands with rigid backbone for use as phosphorescent emitters, and devices, such as organic light emitting diodes are disclosed.

A composition comprising a phosphorescent compound of formula (I) and a polymer comprising a repeat unit of formula (II) Ar.sup.1 is an aryl or heteroaryl group. R.sup.2 is a substituent. A is independently in each occurrence N or CR.sup.3 wherein R.sup.3 is H or a substituent. M is a transition metal or metal ion. x is a positive integer of at least 1. y is 0 or a positive integer. L.sup.1 is a mono- or polydentate ligand. R.sup.1 is a substituent. z is 0 or a positive integer. X is O or S. The phosphorescent compound of formula (I) may be mixed with the polymer or may be covalently bound thereto. The composition may be used in the light-emitting layer of an organic light-emitting device.

An organometallic compound and an organic light-emitting diode (OLED) including the organometallic compound are provided. In exemplary embodiments, the organometallic compound is a platinum complex comprising one or two heterocyclic ligands, the heterocyclic ligands being the same or different if they are two in number, each heterocyclic ligand comprising two nitrogen heterocyclic rings connected by a single bond, one of the rings being six membered and comprising at least one nitrogen and the other ring being a 1,2-diazole or a 1,2,4-triazole ring. One or two other organic ligands may be attached to the central platinum atom in the complex. OLEDs including one of the subject platinum compounds in a light emission layer exhibit lower driving voltages, higher luminances, higher efficiencies and longer lifetimes than do comparative OLEDs built with established dopants incorporated into the light emitting layers.

The present invention provides a novel compound capable of improving light emitting efficiency, stability, and lifespan of the element, an organic electric element using the same, and an electronic device for the same.

Ligands with fused spirocyclic substitutions and metal complexes formed with such ligands and having improved performance in OLED applications are disclosed.

Tetradentate ligands with rigid backbone for use as phosphorescent emitters, and devices, such as organic light emitting diodes are disclosed.

It is an object of the present invention to provide an organometallic complex that can emit phosphorescence. In the following general formula (G1), X represents —O— or —N(R.sup.10)—. R.sup.1 to R.sup.9 each represent any of hydrogen, an alkyl group or a cycloalkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkoxycarbonyl group having 1 to 6 carbon atoms, an acyl group having 1 to 6 carbon atoms, an acyloxy group having 1 to 6 carbon atoms, a halogen group, a haloalkyl group, and an aryl group having 6 to 12 carbon atoms. In addition, R.sup.10 represents any of an alkyl group or a cycloalkyl group having 1 to 6 carbon atoms, an acyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, and a heteroaryl group having 4 to 10 carbon atoms. Moreover, M represents an element belonging to Group 9 or 10. ##STR00001##

An organic electroluminescent element using a compound represented by the following general formula (I) emits dark blue light and has small changes in the chromaticity and in the driving voltage even after driving for a long period of time: ##STR00001##
wherein R.sup.1 to R.sup.6; Q.sup.1 and Q.sup.2; X.sup.1, X.sup.2, X.sup.3 and X.sup.4 are as defined herein.