An organic electroluminescence device includes a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode. The emission layer includes a first host and a second host different from the first host, thereby achieving high efficiency and a long device life.

An organic electroluminescence device includes a first electrode; a second electrode on the first electrode; and a plurality of organic layers between the first electrode and the second electrode, where a polycyclic compound represented by Formula 1-1 or Formula 1-2 is included in at least one organic layer of the plurality of organic layers. The polycyclic compound is represented by Formula 1-1 or Formula 1-2. ##STR00001##

Provided is a compound represented by a formula (1). In the formula (1): X.sup.1 to X.sup.5 each independently represent a nitrogen atom or CR.sup.10; two or more of X.sup.1 to X.sup.5 are nitrogen atoms; Y.sup.1 to Y.sup.5 each independently represent a nitrogen atom or CR.sup.20; one or more of Y.sup.1 to Y.sup.5 are nitrogen atoms; R.sup.10, R.sup.20, and R.sup.5 to R.sup.7 forming neither a monocyclic ring nor a fused ring, and R.sup.8 and R.sup.9 each independently represent a hydrogen atom, an aryl group, a heterocyclic group, or the like; a represents 0, 1, 2, or 3; b represents 0, 1, 2, or 3; and L1 and L2 each independently represent a single bond, an arylene group, a divalent heterocyclic group, or the like.

##STR00001##

A light emitting device includes a first electrode, a hole transporting layer in contact with the first electrode, a second electrode, an electron transporting layer in contact with the second electrode; and an emissive layer between the hole transporting layer and the electron transporting layer. The emissive layer includes a metal-assisted delayed fluorescent (MADF) emitter, a fluorescent emitter, and a host, and the MADF emitter harvests electrogenerated excitons and transfers energy to the fluorescent emitter.

The present invention relates to compounds, which are suitable for use in electronic devices, and to electronic devices, in particular organic electroluminescent devices, containing said compounds.

The present application discloses compounds and compositions, useful in the manufacture of dye-sensitized solar cells and other similar technology.

A compound according to Formula (1), ##STR00001## in which D is an electron donor containing a nitrogen atom and is bonded to a benzene ring through the nitrogen atom; A is an electron acceptor containing a boron atom and is bonded to a benzene ring through the boron atom; m and n are each an integer selected from 1, 2 or 3; and R.sub.11, R.sub.12, R.sub.13, R.sub.14 are each independently selected from the group consisting of a hydrogen atom, alkyl, alkoxy, cyano, trifluoromethyl, an electron acceptor A′, and a nitrogen-containing electron donor D. In the compound, biphenyl acts as a linking unit between the electron donor D and the electron acceptor A, such that units D and A are located at different positions of the molecule, realizing effective separation between HOMO and LUMO. In addition, the light absorption and vibration strength of the molecule are enhanced.

In an embodiment, a composition is provided that includes an indenofluorene moiety; an alkyl radical, an aryl radical, or a heteroaryl radical chemically bound to the indenofluorene moiety; and an electron donor moiety bound to the indenofluorene moiety. In another embodiment, a device is provided that includes compositions described herein. In another embodiment, a method of forming a donor-acceptor small molecule or a donor-acceptor copolymer is provided that includes forming an indenofluorene moiety; forming an electron donor moiety; and reacting the indenofluorene moiety with the electron donor moiety in a cross-coupling reaction.

A quantum dot-containing complex that may be used in a light emitting device, an optical member or devices including same includes: a quantum dot; and at least one ligand coordinated to the surface of the quantum dot and being a monomer represented by Formula 1, as defined herein.

A compound, a material for an organic electroluminescent device and an application thereof are disclosed herein. The compound has a structure represented by Formula (1). The compound has a relatively high refractive index and can effectively improve the light extraction efficiency. The external quantum efficiency of the compound makes it suitable for use as a capping layer when used in an organic electroluminescent device. The compound has a relatively high refractive index in the region of visible light (400-750 nm), which is advantageous for improving the light-emitting efficiency. The compound has a relatively large extinction coefficient in the ultraviolet region (less than 400 nm), which is advantageous for absorbing harmful light and protecting eyesight. Meanwhile, a deuterium atom may be introduced into the compound to significantly improve the device lifetime.