An objective of the disclosure is to provide an organic light-emitting composite material based on an exciplex, which, when used as a light-emitting layer, can enhance the efficiency of an organic electroluminescent device. The disclosure also relates to an organic light-emitting device comprising the organic light-emitting composite material, and use of the organic light-emitting composite material of the disclosure for an organic electron device.

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.

Embodiments of the disclosed subject matter provide an organic light emitting diode (OLED) having an anode, a cathode, an emissive layer disposed between the anode and the cathode, and a hole blocking layer disposed between the emissive and the cathode. The emissive layer may include a phosphorescent dopant, where the phosphorescent dopant has an emission in 0.5% doped PMMA (Poly(methyl methacrylate)) thin film with a peak maximum wavelength that is greater than or equal to 600 nm at room temperature. The energy of a highest occupied molecular orbital (HOMO) of the phosphorescent dopant may be lower than or equal to −5.1 eV, and the energy of the HOMO of the hole blocking layer is at least 0.1 eV lower than the energy of the HOMO of the phosphorescent dopant.

An organic light emitting diode including a plurality delayed fluorescent materials with specific energy levels and an organic light emitting device including the diode is disclosed. When the plurality delayed fluorescent materials with specific energy levels are applied in an emitting material layer, it is possible to minimize the energy loss or exciton quenching during luminous process and to prevent the diode from reducing life span caused by the exciton quenching. When the emitting material layer includes other luminous material having a narrow FWHM, the organic light emitting diode can enhance its color purity.

Provided is an organic light-emitting device including: an anode; a cathode provided to face the anode; and organic material layers including a light emitting layer disposed between the anode and the cathode, wherein the light emitting layer, one or more layers of the organic material layers disposed between the anode and the light emitting layer, and one or more layers from among the organic material layers disposed between the cathode and the light emitting layer, each include one or more compounds each composed of sp3 carbon as a center, the light emitting layer includes a host including one or more anthracene-based compounds, and among organic materials included in the organic material layers, the bandgap energy (E.sub.bg) of each of the organic materials except for a dopant compound is 3 eV or more.

Provided are an organic light emitting device and a display apparatus. An organic light emitting device, including an anode, a cathode, and an emitting layer disposed between the anode and the cathode; wherein a hole transport layer and an electron blocking layer are disposed between the anode and the emitting layer; the hole transport layer and the electron blocking layer satisfy:

|HOMO.sub.HTL−HOMO.sub.EBL|≤0.2 eV wherein HOMO.sub.HTL is a highest occupied molecular orbital, HOMO energy level of the hole transport layer and HOMO.sub.EBL is a HOMO energy level of the electron blocking layer.

Provided are an organic light emitting device and a display apparatus. An organic light emitting device includes an anode, a cathode, and an emitting layer disposed between the anode and the cathode; wherein the emitting layer includes a host material and a dopant material doped in the host material; the host material includes a first host material and a second host material, and the first host material, the second host material, the electron block layer, and the hole block layer satisfy:

|HOMO.sub.1-host-HOMO.sub.EBL|≤0.2 eV,|LUMO.sub.HBL-LUMO.sub.2-host|≤0.2 eV, wherein, HOMO.sub.1-host is a HOMO energy level of the first host material; HOMO.sub.EBL is a HOMO energy level of the electron block layer; LUMO.sub.2-host is a LUMO energy level of the second host material, and LUMO.sub.HBL is a LUMO energy level of the hole block layer.

Provided are a condensed cyclic compound, a light-emitting device including the same, and an electronic apparatus including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer disposed between the first electrode and the second electrode and including an emission layer, and at least one condensed cyclic compound, which is represented by Formula 1, which is defined in the specification:

##STR00001##

A light-emitting device is provided. The light-emitting device includes an anode, a cathode, and a combined charge transport and emissive layer (CCTEL) disposed between the anode and the cathode. The CCTEL includes a crosslinked charge transport material, a first plurality of quantum dots having a first energy gap, and a second plurality of quantum dots having a second energy gap wider than the first energy gap.

An organic semiconductor device is revealed. The organic semiconductor device includes a first electrode, an electron transport layer, an active layer, a hole transport layer, and a second electrode. The active layer includes an electron donor and at least one electron acceptor. The energy barrier between HOMO level of the electron donor and the energy level of PEDOT:PSS or derivatives in the electron transport layer is less than 0.4 eV. The use of the organic semiconductor device and a formulation of materials for the active layer are also disclosed.