This invention relates to an iridium metal complex. The iridium metal complex comprises no more than three 1,3-dihydro-2H-benzo[d]imidazol-2-ylidene based carbene cyclometalate ligands. The iridium metal complex provides a blue emission. This is useful for organic light emitting diode (OLED) components where blue emitters have trailed behind the advances of red and green emitters.

Organic-inorganic light-absorbing materials with perovskite structure, being used in perovskite solar cells production. The objective of the invention is to provide the possibility of obtaining perovskite using precursors that are in a liquid state without the use of additional substances and reagents. The concept of the invention is based on the fact that a light-absorbing material with perovskite structure with general formula ADB.sub.3, where A stands for methylammonium MA.sup.+ (CH.sub.3NH.sub.3.sup.+), formamidinium, FA.sup.+ ((NH.sub.2).sub.2CH.sup.+), guanidinium Gua (C(NH2)3+), cesium Cs.sup.+ or a mixture thereof, B stands for Cl.sup.−, Br.sup.−, I.sup.− or a mixture thereof, while the component D represents Sn, Pb, Bi or a mixture thereof, is obtained by mixing composition AB-nB.sub.2 and a component containing D, where the component containing D is chosen from elemental Sn, Pb, Bi and/or their salts, mixtures, alloys, whereas the composition AB-nB.sub.2 is deposited onto the component D followed by subsequent removal of the excessive components, n is greater than or equal to one, the component B.sub.2 represents Cl.sub.2, Br.sub.2, I.sub.2 or a mixture thereof.

An organic electroluminescence device includes an anode, a cathode, a first emitting layer, and a second emitting layer provided between the first emitting layer and the cathode, in which the first emitting layer includes, as a first host material, a first compound that includes at least one group represented by a formula (11) below, the first compound being represented by a formula (1) below, the second emitting layer includes a second compound represented by a formula (2A) below as a second host material, and the first emitting layer is in direct contact with the second emitting layer.

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To provide an organic electroluminescent device having high efficiency and high driving stability while having a low driving voltage. The organic electroluminescent device has one or more light-emitting layers between an anode and a cathode opposed to each other, wherein at least one of the light-emitting layers is a light-emitting layer composed of a vapor deposition layer containing a first host, a second host and a light-emitting dopant material; the first host is selected from oligopyridine compounds represented by the general formula (1); and the second host is selected from carbazole compounds having two or more carbazole rings, indolocarbazole compounds having an indolocarbazole ring or compounds having a carbazole ring and an indolocarbazole ring.

A light-emitting element includes: a first electrode; a second electrode; and a light-emitting layer between the first electrode and the second electrode, wherein the light-emitting layer includes quantum dots and a cyclic organic compound, and at least some of atoms that form a ring of the cyclic organic compound are coordinated to the quantum dots.

The solar cell of the present disclosure includes a first electrode, a photoelectric conversion layer, an intermediate layer, a hole transport layer, and a second electrode in this order, wherein the hole transport layer includes a hole transport material and an oxidant, the photoelectric conversion layer includes a perovskite compound containing iodine, and the intermediate layer includes at least one selected from the group consisting of bromide, chloride, and fluoride.

The present invention relates to semiconducting nanoparticle.

A light-emitting device with high heat resistance is provided. The light-emitting layer device includes an anode, a cathode; and an EL layer between the anode and the cathode. The EL layer includes a light-emitting layer and a first layer. The first layer is between the light-emitting layer and the cathode. The light-emitting layer is in contact with the first layer. The light-emitting layer includes a first organic compound and a light-emitting substance. The first layer includes a second organic compound. The light-emitting substance is a substance that emits blue light. The first organic compound is an organic compound including a fused aromatic hydrocarbon ring. The second organic compound is an organic compound including a heteroaromatic ring skeleton including one selected from a pyridine ring, a diazine ring, and a triazine ring; and a bicarbazole skeleton.

Provided is a novel metal complex that can be used as an electron transporting material. A metal complex represented by the following Formula (1) to the following Formula (3). R.sup.A1 to R.sup.A9, R.sup.C1 to R.sup.C8, and R.sup.E1 to R.sup.E6 are each independently a single bond, an alkylene group, an arylene group, a heteroarylene group, or a group represented by —R.sup.P1—P(═O)R.sup.P2—R.sup.P3—, R.sup.B1 to R.sup.B9, R.sup.D1 to R.sup.D8, and R.sup.F1 to R.sup.F6 are each independently a hydrogen atom, an. alkyl group, an aryl group, a heteroaryl group, an alkoxy group, an aryloxy group, a heteroaryloxv group, an amino group, a cyano group, a halogen atom, or a hydroxy group, one or more selected from the group consisting of R.sup.B1 to R.sup.B9 are a phenanthrolinyl group, one or more selected from the group consisting of R.sup.D1 to R.sup.D8 are a phenanthrolinyl group, and one or more selected from the group consisting of R.sup.F1 to R.sup.F6 are a phenanthrolinyl group, M is an alkali metal or an alkaline earth metal, Z is 1 or 2, and X is O or S.

The present invention relates to organic electroluminescent devices, the emitting layer thereof containing a blend of a luminescent material having a narrow singlet-triplet gap and a fluorescent emission material having high steric shielding.