A nitrogen-containing compound as shown in Chemical formula (1), an electronic element, and an electronic device are provided. In Chemical formula (1), Ar.sub.1 and Ar.sub.2 are selected from a substituted or unsubstituted C6 to C30 aryl, a substituted or unsubstituted C3 to C30 heteroaryl, or a substituted or unsubstituted C3 to C20 cycloalkyl; Ar.sub.3 is selected from a substituted or unsubstituted C6 to C20 aryl, or a substituted or unsubstituted C3 to C20 heteroaryl.

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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 (2) below as a second host material, and the first emitting layer is in direct contact with the second emitting layer. L.sub.101 is a single bond or a substituted or unsubstituted arylene group having 6 to 50 ring carbon atoms. Ar.sub.101 is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms. mx is 0, 1, 2, 3, 4, or 5.

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An organic electroluminescence device includes an anode, a cathode, and an emitting layer disposed between the anode and the cathode. The emitting layer comprises a delayed fluorescent compound M2 having at least one deuterium atom and a compound M3 having at least one deuterium atom. A singlet energy S.sub.1(M2) of the compound M2 and a singlet energy S.sub.1(M3) of the compound M3 satisfy the relationship S.sub.1(M3)>S.sub.1(M2).

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

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

The present disclosure relates to a novel organic compound which has excellent thermal stability, electron transporting ability, and light emitting ability, and to an organic EL device containing the same. As the organic compound is used in an organic material layer of the organic EL device, the thermal stability, luminous efficiency, driving voltage, and life of the device can be improved.

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

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

Tetraphenylene triarylamine compounds are disclosed, which are novel triarylamine compounds containing tetraphenylene building block. The compounds can be used as charge transporting materials, hole transporting materials, hole injection materials, electron blocking materials, etc., in an electroluminescent device. These novel compounds have good sublimation characters, and can offer more controllable charge transporting performance and good OLED device performance. Also disclosed are an organic electroluminescent device and a formulation.

The present disclosure relates to the field of organic light-emitting materials, and more particularly, to a thermally activated delayed fluorescence material having red, green, or blue color, a synthesis method thereof, and application thereof. The thermally activated delayed fluorescence material having red, green, or blue color has the following structural formula: ##STR00001## the present disclosure provides a novel thermally activated delayed fluorescence material having red, green, or blue color which has a lower singlet triplet energy level difference, a high RISC rate constant (kRISC), and a high photoluminescence quantum yield (PLQY). It has significant characteristics of a thermally activated delayed fluorescence material and a long service life that can be used in an electroluminescent display and a light-emitting equipment structure which are mass produced.