The disclosure relates to organic electroluminescent elements, compounds for use in the elements, and devices using the elements, which include a compound represented by the following General Formula (1): ##STR00001##
where R.sup.1 to R.sup.3 and R.sup.6 to R.sup.8 each independently represents a hydrogen atom, which may be a deuterium atom, or a substituent with a Hammett substituent constant σ.sub.p value of −0.15 or more, R.sup.5, R.sup.9 and R.sup.10 each independently represents a hydrogen atom or a substituent, L.sup.1 represents a divalent linking group, DG.sup.1 represents a donor group, and n1 represents 1 or 2, and where R.sup.1 to R.sup.3, R.sup.5 to R.sup.10, L.sup.1, and DG.sup.1 are not bound to each other to form a ring.

Provided is a light-emitting element with high emission efficiency including a fluorescent material as a light-emitting substance. In a light-emitting element including a pair of electrodes and an EL layer between the pair of electrodes, a delayed fluorescence component due to triplet-triplet annihilation accounts for 20% or more of light emitted from the EL layer, and the light has at least one emission spectrum peak in the blue wavelength range. The EL layer includes an organic compound in which an energy difference between the lowest singlet excited energy level and the lowest triplet excited energy level is 0.5 eV or more. The EL layer includes a benzo[a]anthracene compound.

The present specification relates to a heterocyclic compound represented by Chemical Formula 1, and an organic light emitting device comprising the same.

Provided is a light-emitting element with high emission efficiency including a fluorescent material as a light-emitting substance. In a light-emitting element including a pair of electrodes and an EL layer between the pair of electrodes, a delayed fluorescence component due to triplet-triplet annihilation accounts for 20% or more of light emitted from the EL layer, and the light has at least one emission spectrum peak in the blue wavelength range. The EL layer includes an organic compound in which an energy difference between the lowest singlet excited energy level and the lowest triplet excited energy level is 0.5 eV or more. The EL layer includes a benzo[a]anthracene compound.

The present invention relates to organic light emitting elements, comprising thermally activated delayed fluorescence (TADF) emitters and/or hosts of formula ##STR00001##
which have a sufficiently small energy gap between S.sub.1 and T.sub.1 (ΔE.sub.ST) to enable up-conversion of the triplet exciton from T.sub.1 to S.sub.1. The organic light emitting elements show high electroluminescent efficiency.

Provided are a condensed cyclic compound and an organic light-emitting device including the same. The organic light-emitting device may include a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode. The organic layer may include the condensed cyclic compound represented by Formula 1: ##STR00001## In Formula 1, rings A.sub.1, A.sub.2, and A.sub.3 may each be independently a C.sub.5-C.sub.60 carbocyclic group or a C.sub.2-C.sub.30 heterocyclic group, and n1 to n3 may each be independently 0 or 1, provided that the sum of n1, n2, and n3 is 1. In addition, the descriptions of X.sub.1, L.sub.1 to L.sub.9, a1 to a9, Ar.sub.1 to Ar.sub.6, b1 to b6, R.sub.1 to R.sub.3, and c1 to c3 are as defined in the present specification.

Specific polycyclic compounds of the general formula (I) and a process for its preparation, an electronic device comprising at least one of these compounds, an emitting layer, preferably present in an electronic device, comprising at least one compound of general formula (I) and the use of compounds according to general formula (I) in an electronic device as a host material, a charge transporting material, charge and/or exciton blocking material, preferably as a host material or an electron transporting material. ##STR00001##

The present specification relates to an organic light emitting device comprising a first electrode, a second electrode, and an organic material layer comprising one or more layers provided between the first electrode and the second electrode, wherein the one or more layers of the organic material layer comprise a heterocyclic compound represented by Chemical Formula 1 and a heterocyclic compound represented by Chemical Formula 2, a composition for the organic material layer of the organic light emitting device, and a method for manufacturing the organic light emitting device.

An organic electroluminescent device is disclosed. The organic electroluminescent device achieves low driving voltage and high luminous efficiency as well as long lifespan by including an exciton confinement layer (ECL), in which a predetermined physical property is adjusted, in an area of an electron transporting area, including at least two layers, that is adjacent to an emissive layer.

The present specification relates to a heterocyclic compound represented by Chemical Formula 1, and an organic light emitting device comprising the same.