An organic molecule that may be used application in optoelectronic devices is disclosed. The organic molecule has a structure of formula 1, wherein R.sup.I, R.sup.II, R.sup.III, R.sup.IV, R.sup.V, R.sup.VI, R.sup.VII, R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E, R.sup.F, R.sup.G and R.sup.H are independently selected from the group consisting of: hydrogen, deuterium, halogen, C.sub.1-C.sub.12-alkyl, wherein optionally one or more hydrogen atoms are independently substituted by R.sup.5; C.sub.6-C.sub.18-aryl, wherein optionally one or more hydrogen atoms are independently substituted R.sup.5; and C.sub.3-C.sub.15-heteroaryl, wherein optionally one or more hydrogen atoms are independently substituted R.sup.5; optionally, any adjacent two of R.sup.I, R.sup.II, R.sup.III, R.sup.IV, R.sup.V, R.sup.VI, R.sup.VII, R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E, R.sup.F, R.sup.G and R.sup.H form a monocyclic ring system having 5 to 8 C-atoms, at least R.sup.A and R.sup.B as well as R.sup.C and R.sup.D form a monocyclic ring system having 5 to 8 C-atoms, wherein, optionally, each hydrogen is independently substituted.

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The invention relates to an organic electroluminescent device comprising a light-emitting layer B comprising a host material H.sup.B, a thermally activated delayed fluorescence (TADF) material E.sup.B, and a depopulation agent S.sup.B.

The present invention relates to providing fluorescent silica nanoparticles having high luminance even when many fluorescent dyes are contained in silica particles. Fluorescent silica nanoparticles according to the present invention is fluorescent silica nanoparticles including silica nanoparticles and fluorescent dyes contained in the silica nanoparticles, in which a total volume of the fluorescent dyes is 5% or more with respect to a total volume of the fluorescent silica nanoparticles, and an emission quantum yield of the fluorescent silica nanoparticles is 10% or more.

A series of novel donor-acceptor type TADF luminogens have been designed with the aim of developing stable OLEDs with enhanced operational stability and improved color purity. These materials could be found utilization for full color displays and lighting applications.

An organic light emitting device including: a substrate; a first electrode; a second electrode; and an organic layer interposed between the first electrode and the second electrode and including an emission layer, wherein one of the first electrode and the second electrode is a reflective electrode and the other is a semitransparent or transparent electrode, and wherein the organic layer includes a layer having at least one of the compounds having at least one carbazole group, and a flat panel display device including the organic light emitting device. The organic light emitting device has low driving voltage, excellent current density, high brightness, excellent color purity, high efficiency, and long lifetime.

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

The present invention relates to a real-time fluorescence imaging sensor for measuring glutathione in cell organelles and a method for fabricating the same. More specifically, the present invention relates to a novel compound for measuring glutathione in cell organelles, a method for preparing the novel compound, a real-time fluorescence imaging sensor for measuring glutathione in cell organelles, which comprises the novel compound, a method for fabricating the imaging sensor, and a method of measuring glutathione in cell organelles by use of the imaging sensor. When the composition comprising the compound according to the present invention is used, it can measure the antioxidant activity of the organelle mitochondria or Golgi apparatus in living cells, particularly stem cells, and can screen highly active stem cells based on the results obtained by measuring the antioxidant activity of the cell organelle.

The present disclosure relates to the field of OLED technologies and provides a compound having TADF property. In an embodiment, the compound has a structure represented by Formula (1), in which L.sub.1 and L.sub.2 are each a hydrogen atom, phenyl, naphthyl, anthracyl, pyridyl, pyrimidinyl, and pyrazinyl; R.sub.1 and R.sub.2 are each aryl or and heteroaryl, such as a carbazole-derived group, an acridine-derived group, diarylamino, a diarylamine-derived group, and the like. In the present disclosure, the double boron heterocyclic structure functions not only as an electron acceptor but also as a linker. In the compound according to the present disclosure, by attaching a group having a large steric hindrance to the boron atom of the boron heterocyclic ring, the molecules the compound are prevented from aggregating, and thus a π-aggregation or excimer formed by direct accumulation of the conjugate plane is avoided, thereby improving the light-emitting efficiency. ##STR00001##

A compound represented by the following general formula is excellent in light emission properties. R.sup.1 and R.sup.2 each independently represent a fluorinated alkyl group, D represents a substituent in which Hammett's σ.sub.p value is negative, and A represents a substituent in which Hammett's σ.sub.p value is positive. ##STR00001##

An organic electroluminescence device and a display apparatus, where the organic electroluminescence device includes an organic light emitting layer which includes a host material, a sensitizer material, and a resonance thermally activated delayed fluorescent material, where the host material is a wide bandgap material, and the sensitizer material is an exciplex material, a singlet state energy level for the wide bandgap material is greater than a singlet state energy level for the exciplex, and a triplet state energy level for the wide bandgap material is greater than a triplet state energy level for the exciplex, and a singlet state energy level for the exciplex material is greater than a singlet state energy level for the resonance delayed fluorescent material, and a triplet state energy level for the exciplex material is greater than a triplet state energy level for the resonance delayed fluorescent material.