The present invention includes novel heterocyclic materials for use as blue phosphorescent materials in OLED devices. The novel materials include two fused 5-membered aromatic or pseudoaromatic rings, which are bonded with 6 membered aromatic rings to serve as chelation ligands for a transition metal. The novel materials were determined computationally to have appropriate triplet energies for use as blue emitters and to possess sufficient chemical stability for use in devices.

Novel phosphorescent metal complexes containing ligands having the Formula I: ##STR00001##
bearing either a naphthalene or other fused heterocycle moieties such as benzofuran and benzothiophene useful as emitters in OLEDs and improve the device efficiency and the FWHM of the emission.

A quantum dot composition includes a quantum dot, and a ligand bonded to a surface of the quantum dot, wherein the ligand includes a head portion bonded to the surface of the quantum dot, a connecting portion connected to the head portion and including a metal, and a tail portion coordinated to the metal of the connecting portion. The quantum dot composition according to the present embodiments is used to form an emission layer of a light emitting element, and may thus increase service life and luminous efficiency of the light emitting element including the emission layer formed using the quantum dot composition.

The present invention relates to a light-emitting layer B comprising a first emitter compound (a) having a non-exited state S0(a), a first excited singlet state S1(a) and a first excited triplet state T1(a); a second emitter compound (b) having a non-exited state S0(b), a first excited singlet state S1(b) and a first excited triplet state T1(b), wherein the energy level of S1(a) is higher than that of S1(b), the energy level of S1(b) is higher than that of T1(b) and wherein the rate of reverse intersystem crossing from T1(a) to S1(a) is higher than the rate of excitation energy transfer from S1(a) to S1(b) and/or the rate of excitation energy transfer from T1(a) to T1(b), and/or wherein the energy level of T1(b) is higher than that of T1(a). Further, the present invention also refers to an opto-electronic device comprising such light-emitting layer B and use thereof.

An organometallic compound, represented by Formula 1:

M.sub.1(L.sub.n1).sub.n1(L.sub.n2).sub.n2  Formula 1

wherein, M.sub.1 is a transition metal, L.sub.n1 is a ligand represented by Formula 1A, L.sub.n2 is a ligand represented by Formula 1B, n1 is 0, 1, or 2, and n2 is 1, 2, or 3,

##STR00001## wherein * and *′ each indicate a binding site to Mt, and CY.sub.1, CY.sub.2, R.sub.1, R.sub.2, R.sub.10, R.sub.20, X.sub.1, X.sub.2, Y.sub.1 to Y.sub.8, L.sub.1, Ar.sub.1, b10, b20, a1, and k1 are each as described herein.

Compounds comprising a first ligand and a second ligand; wherein the first ligand coordinates to a first metal through a first metal-carbene bond; the second ligand coordinates to a second metal through a second metal-carbene bond; the second ligand also coordinates to the first metal; the first ligand can link to the second ligand to form a multidentate ligand; and the first metal and the second metal are each independently selected from the group consisting of Au, Ag, and Cu can act as electron acceptors in tandem to increase the energy separation between the ground and excited state, which is higher than those found in analogous monometallic complexes. These compounds should find application as luminescent materials in organic light emitting diodes (OLEDs).

Disclosed are a quantum dot-containing material, a method of preparing the quantum dot-containing material, a composition including the quantum dot-containing material, and a light-emitting device including the quantum dot-containing material.

The present invention relates to dinuclear metal complexes and to electronic devices, especially organic electroluminescent devices, comprising these metal complexes.

Provided are a light-emitting device and an electronic apparatus including the light-emitting device, the light-emitting device including: a first electrode; a second electrode; an emission layer arranged between the first electrode and the second electrode; and a buffer layer arranged between the first electrode and the emission layer, wherein the buffer layer is in direct contact with the emission layer, the emission layer includes a first compound represented by Formula 1, and the buffer layer includes a second compound represented by Formula 5. The first compound and the second compound are respectively the same as those described in the present specification.

Heteroleptic carbene complexes and the use thereof in organic electronics The present invention relates to heteroleptic complexes comprising a phenylimidazole or phenyltriazole unit bonded via a carbene bond to a central metal atom, and phenylimidazole ligands attached via a nitrogen-metal bond to the central atom, to OLEDs which comprise such heteroleptic complexes, to light-emitting layers comprising at least one such heteroleptic complex, to a device selected from the group consisting of illuminating elements, stationary visual display units and mobile visual display units comprising such an OLED, to the use of such a heteroleptic complex in OLEDs, for example as emitter, matrix material, charge transport material and/or charge blocker.