The present specification provides a nitrogen-containing condensed cyclic compound of chemical formula 1 and an organic light emitting device comprising the same.

An electro-optic cell for an electrochromic device includes an electrochromic medium including an electrochromic compound M having at least one reduced state and at least one oxidized state. The electrochromic compound M can act as both the anodic material and the cathodic material in the electro-optic cell. The electrochromic medium can be capable of reversibly attenuating transmittance of light having a wavelength within a predetermined range.

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 specification provides a nitrogen-containing condensed cyclic compound of chemical formula 1 and an organic light emitting device comprising the same.

Luminescent solar concentrator (LSC) comprising at least one disubstituted benzoheterodiazole compound of general formula (I), in which: Z represents a sulfur atom, an oxygen atom, a selenium atom; or an NR.sub.6 group in which R.sub.6 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkyl groups, or from optionally substituted aryl groups; R.sub.1, R.sub.2 and R.sub.3, which are the same or different, represent a hydrogen atom; or are selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkyl groups, optionally containing heteroatoms, optionally substituted cycloalkyl groups, optionally substituted aryl groups, optionally substituted linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkoxyl groups, optionally substituted phenoxyl groups, or COOR.sub.7 groups or OCOR.sub.7 groups in which R.sub.7 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkyl groups, or is a cyano group, provided that when the substituents R.sub.1 represents a hydrogen atom, at least one of the substituents R.sub.2 and R.sub.3 represents an optionally substituted aryl group or an optionally substituted phenoxyl group; or R.sub.1 and R.sub.2, can optionally be linked together so as to form, together with the carbon atoms to which they are linked, a saturated, unsaturated or aromatic cyclic ring or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorus, selenium; or R.sub.2 and R.sub.3 can optionally be linked together so as to form, together with the carbon atoms to which they are linked, a saturated, unsaturated or aromatic cyclic ring or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorus, selenium; R.sub.4 and R.sub.5, which are the same or different, represent a hydrogen atom; or are selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkyl groups, optionally containing heteroatoms, optionally substituted cycloalkyl groups, optionally substituted aryl groups, optionally substituted linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkoxyl groups, COOR.sub.7 groups or OCOR.sub.7 groups in which R.sub.7 is selected from linear or branched C.sub.1-C.sub.20, preferably C.sub.1-C.sub.8, alkyl groups, or is a cyano group; or R.sub.4 and R.sub.5, can optionally be linked together so as to form, together with the carbon atoms to which

To provide a light-emitting element with high emission efficiency and low driving voltage. The light-emitting element includes a guest material and a host material. A LUMO level of the guest material is lower than a LUMO level of the host material. An energy difference between the LUMO level and a HOMO level of the guest material is larger than an energy difference between the LUMO level and a HOMO level of the host material. The guest material has a function of converting triplet excitation energy into light emission. An energy difference between the LUMO level of the guest material and the HOMO level of the host material is larger than or equal to energy of light emission of the guest material.

Compounds of General Formula I may harvest electrogenerated excitons via metal-assisted delayed fluorescence (MADF). The compounds have utility in light emitting diodes and light emitting devices.

Disclosed is a benzazole derivative having a heteroaryl group, wherein the benzazole derivative having the heteroaryl group is represented by Chemical Formula 1. Also disclosed is an organic electroluminescence device including an organic layer containing the benzazole derivative having the heteroaryl group: ##STR00001## wherein, each of Z1, X1, X2, X3, Ar1, Ar2, Ar3, m1, m2 and q is the same as defined in the specification.

A compound having a formula M(L.sub.A).sub.x(L.sub.B).sub.y(L.sub.C).sub.z, where each of L.sub.A, L.sub.B, and L.sub.C is a different bidentate ligand is provided. In formula M(L.sub.A).sub.x(L.sub.B).sub.y(L.sub.C).sub.z, x+y+z is equal to the valence of the metal M, the first ligand L.sub.A has a structure of Formula I,

##STR00001##

each of moiety A and moiety B is a monocyclic ring or a polycyclic fused ring system; each of X.sup.1 to X.sup.4 and Z.sup.1 and Z.sup.2 is C or N; each of K.sup.1, K.sup.2, and L.sup.1 is a direct bond of a linker; L.sup.1 is a direct bond or an organic linker; each R substituent is hydrogen or a General Substituent defined herein; and at least one R.sup.A or R.sup.B comprises a ring D that is an electron-deficient heterocyclic ring comprising one or two ring carbon atoms. Formulations, OLEDs, and consumer products containing such compounds are also provided.

The present disclosure provides a new series of compounds exhibiting high fluorescence quantum yields in the solid state. In one embodiment, the compounds include a series of 2,3,4,5-tetraphenylgermoles with the same or different 1,1-substituents. In another embodiment, substituted germafluorenes, germa-fluoresceins/rhodamines, and germapins are described. These germanium heterocycles possess ideal photophysical and thermostability properties, which makes them excellent candidates for chemical or biological sensors, host materials for electroluminescent devices and solar cells, and emissive and for electron-transport layer components in organic light emitting diode devices.