The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent device with improved driving voltage and/or power efficiency can be provided by using the organic electroluminescent compound according to the present disclosure.

To provide a light-emitting element which uses a fluorescent material as a light-emitting substance and has higher luminous efficiency. To provide a light-emitting element which includes a mixture of a thermally activated delayed fluorescent substance and a fluorescent material. By making the emission spectrum of the thermally activated delayed fluorescent substance overlap with an absorption band on the longest wavelength side in absorption by the fluorescent material in an S.sub.1 level of the fluorescent material, energy at an S.sub.1 level of the thermally activated delayed fluorescent substance can be transferred to the S.sub.1 of the fluorescent material. Alternatively, it is also possible that the S.sub.1 of the thermally activated delayed fluorescent substance is generated from part of the energy of a T.sub.1 level of the thermally activated delayed fluorescent substance, and is transferred to the S.sub.1 of the fluorescent material.

A charge-transfer salt formed from a material comprising a repeat unit of formula (I) and an n-dopant: wherein BG is a backbone group of the repeat unit; R.sup.1 is a ionic substituent comprising at least one cationic or anionic group; n is at least 1; R.sup.2 is a non-ionic substituent; and m is 0 or a positive integer; the material further comprising a counterion balancing the charge of the cationic or anionic group. ##STR00001##

Organic electroluminescent materials and devices are disclosed. The organic electroluminescent materials are novel benzodithiophene or its analogous structure compounds, which can be used as charge transporting materials, hole injection materials, or the like in an electroluminescent device. These novel compounds can offer excellent performance compared with existing materials, for example, to further improve the voltage, efficiency and/or lifetime of the OLEDs.

The present invention relates to oxocarbon-, pseudooxocarbon- and radialene compounds as well as to their use as doping agent for doping an organic semiconductive matrix material, as blocker material, as charge injection layer, as electrode material as well as organic semiconductor, as well as electronic components and organic semiconductive materials using them.

The present invention relates to an organic light emitting diode comprising an anode, a cathode, a first emission layer, a second emission layer, a first charge generation, layer and a first electron transport layer stack; and to a display device or lighting device comprising the same.

To provide a light-emitting element which uses a fluorescent material as a light-emitting substance and has higher luminous efficiency. To provide a light-emitting element which includes a mixture of a thermally activated delayed fluorescent substance and a fluorescent material. By making the emission spectrum of the thermally activated delayed fluorescent substance overlap with an absorption band on the longest wavelength side in absorption by the fluorescent material in an S.sub.1 level of the fluorescent material, energy at an S.sub.1 level of the thermally activated delayed fluorescent substance can be transferred to the S.sub.1 of the fluorescent material. Alternatively, it is also possible that the S.sub.1 of the thermally activated delayed fluorescent substance is generated from part of the energy of a T.sub.1 level of the thermally activated delayed fluorescent substance, and is transferred to the S.sub.1 of the fluorescent material.

A compound of formula (I): (Core)n-(X)m wherein Core is a core group; n is 0 and m is 1, or n is 1 and m is at least 1; and X is a group of formula (II): wherein: R.sup.1, R.sup.3 and R.sup.5 are each independently H or a substituent; R.sup.2 and R.sup.4 are each a substituent; one of R.sup.1-R.sup.5 is a direct bond or divalent linking group linking the group of formula (II) to Core in the case where n is 1; x and y are 0, 1, 2, 3 or 4; and the compound of formula (I) is substituted with at least one ionic substituent. The compound may be used as an n-dopant to dope an organic semiconductor. ##STR00001##

The present invention relates to a charge transporting semi-conducting material comprising: a) optionally at least one electrical dopant, and b) at least one cross-linked charge-transporting polymer comprising 1,2,3-triazole cross-linking units, a method for its preparation and a semiconducting device comprising the charge transporting semi-conducting material.

The invention relates to a light harvesting array or dye comprising an acceptor linked to a donor, wherein at least one of the acceptor or the donor is an oligomeric unit comprising a first optionally substituted rylene linked via a linker group to a second optionally substituted rylene, the first optionally substituted rylene is linked to the acceptor or the donor and the second optionally substituted rylene is capable of energy transfer to at least one of the first optionally substituted rylene, the acceptor or the donor. The invention also relates to compounds which may be used as light harvesting arrays, methods for their manufacture, and devices and materials comprising the light harvesting array or dye, for example, chromophoric materials, light guides, photobioreactors, photoluminescent algae systems, photodetectors, photovoltaic devices and luminescent/fluorescent solar concentrators.