The present disclosure relates to an OLED that includes a first electrode; a second electrode facing the first electrode; a first emitting material layer including a first host being an anthracene derivative and a first dopant being a pyrene derivative and positioned between the first and second electrodes; and a first electron blocking layer including an electron blocking material of a spirofluorene-substituted amine derivative and positioned between the first electrode and the first emitting material layer, wherein at least one of hydrogen atoms in the anthracene derivative and the pyrene derivative is deuterated.

Provided in the present disclosure are a thermally activated delayed fluorescent material, an organic light-emitting device and a display apparatus. The energy level difference between a singlet energy level and a triplet energy level of the thermally activated delayed fluorescent material is less than 0.3 eV, and a spin-orbit coupling value SOC between a singlet state and a triplet state of the thermally activated delayed fluorescent material is SOC≤0.05 cm.sup.−1.

Provided is an OLED that includes: a first electrode; a second electrode; a first layer, and an emissive layer disposed between the first electrode and the second electrode, where the first layer is selected from the group consisting of a hole injecting layer, a hole transporting layer, an electron blocking layer, a hole blocking layer, an electron transporting layer, and an electron injecting layer; and the first layer includes a first compound that includes a first element selected from the group that only includes D, F, CN, Si, Ge, P, B, and Se.

Provided are a nitrogen-containing compound, an electronic element, and an electronic device, and the present disclosure belongs to the technical field of organic materials. The structure of the nitrogen-containing compound is as shown in chemical formula (1); and the nitrogen-containing compound can improve the properties of an electronic element. ##STR00001##

Provided is an organic light emitting device, including a first electrode, a second electrode, and an emitting layer disposed between the first electrode and the second electrode. An electron blocking layer and a hole transport layer are disposed between the emitting layer and the first electrode. The electron blocking layer is located between the hole transport layer and the emitting layer. The material of the electron blocking layer includes a compound having the following structural formula:

##STR00001##

Provided is a novel compound of Chemical Formula 1:

##STR00001##

wherein: A is a thiazole ring or an oxazole ring fused with an adjacent ring; L.sub.1 is a single bond, substituted or unsubstituted C.sub.6-60 arylene, or substituted or unsubstituted C.sub.2-60 heteroarylene containing at least of N, O and S; R.sub.1 is

##STR00002##

Ar.sub.1 to Ar.sub.4 are each independently substituted or unsubstituted C.sub.6-60 aryl or substituted or unsubstituted C.sub.2-60 heteroaryl containing at least one of N, O and S; L.sub.2 to L.sub.5 are each independently a single bond, substituted or unsubstituted C.sub.6-60 arylene, or substituted or unsubstituted C.sub.2-60 heteroarylene containing at least one of N, O and S; R.sub.2 is a substituted or unsubstituted C.sub.6-60 aryl or substituted or unsubstituted C.sub.2-60 heteroaryl containing at least of N, O and S; D is deuterium; and n is an integer of 0 to 5, and an organic light emitting device comprising the same.

The present specification relates to a heterocyclic compound represented by Formula 1, an organic light emitting device comprising the same, a composition for organic layer of the organic light emitting device, and a method of manufacturing the organic light emitting device.

Provided are a phenanthrene compound and use thereof, wherein the phenanthrene compound has the structure represented by Formula I. The phenanthrene organic compound contains a heteroarylamine structure, and at least one of Ar.sub.2 and Ar.sub.3 is selected from substituted or unsubstituted C2-C20 nitrogen-containing fused-ring heteroaryl having an electron-withdrawing property. All active sites of phenanthrene are substituted and passivated, and the phenanthrene has a stable chemical structure and high thermal stability. The phenanthrene compound thus has a high glass transition temperature and a high refractive index in the visible-light field, and when applied to the CPL layer of an organic electroluminescent device, can effectively improve the light extraction efficiency of the organic electroluminescent device, thereby improving the luminescence efficiency and service life of the organic electroluminescent device.

Embodiments provide a light-emitting device that includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, a first compound represented by Formula 1, a second compound represented by Formula 2, and at least one of a third compound represented by Formula 3 and a fourth compound represented by Formula 4, wherein the first compound to the fourth compound are different from each other, and Formulae 1 to 4 are described in the specification:

##STR00001##

An organic light emitting diode, a manufacturing method thereof, a display substrate and a display apparatus are disclosed. The organic light emitting diode includes: a first electrode and a second electrode opposite to each other and a first hole transport layer, a first electron blocking layer, a blue emission layer, at least one first hole blocking layer, and a first electron transport layer, which are between the first electrode and the second electrode and sequentially arranged in a direction approaching the second electrode, wherein a total thickness of all the at least one first hole blocking layer is greater than a thickness of the first electron blocking layer.