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

There is provided an organic EL device, including: an anode; a cathode; an emitting layer provided between the anode and the cathode; a first layer provided between the anode and the emitting layer; and a second layer provided between the anode and the first layer, in which the emitting layer contains a delayed fluorescent compound, the first layer contains a first compound, the second layer contains a second compound, an ionization potential Ip(HT1) of the first compound satisfies Numerical Formula 1, a hole mobility μh(HT1) of the first compound satisfies Numerical Formula 2, an ionization potential Ip(HT2) of the second compound satisfies Numerical Formula 3, and the first layer has a film thickness of 15 nm or more,

Ip(HT1)≥5.69 eV  (Numerical Formula 1)

μh(HT1)≥1.00×10.sup.−5 cm.sup.2/Vs  (Numerical Formula 2)

Ip(HT2)≥5.60 eV  (Numerical Formula 3).

A nitrogen-containing compound is represented by the following Formula 1 ##STR00001##
where B.sub.1 to B.sub.4 are each independently N or CR.sub.1, A.sub.1 is an electron accepting group, L1 and R1 are further defined, and D is an electron donating group represented by the following Formula 2 ##STR00002##
X is Si or Ge and Y1, Y2, R2, R3, n and m are further defined. An organic electroluminescence device includes the nitrogen-containing compound.

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

Rapid prototyping and delivery of fluorescent medical devices using a 3D printer provided with a processed digital design and fluorescent filament feedstock. The fluorescent filament may comprise a polymer such as acrylonitrile butadiene styrene and between 10 and 100 ppm of a fluorophore such as indocyanine green embedded uniformly throughout the polymer. The filament may include about one percent by weight of a colorant. The 3D printer may be located at the site of use by an end user, such as a physician office, hospital, or operating room for printing of the fluorescent medical device on demand.

Disclosed are a compound for an organic optoelectronic device represented by Chemical Formula 1, a composition for an organic optoelectronic device, an organic optoelectronic device including the same, and a display device. Details of Chemical Formula 1 are the same as defined in the specification.

The present invention relates to compounds of the formula (1) which are suitable for use in electronic devices, in particular organic electroluminescent devices, and to electronic devices which comprise these compounds.

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

A composition comprising at least an electron-donating color-developing organic compound, an electron-accepting compound, and a color development regulator that hampers the color development by the electron-donating color-developing organic compound and the electron-accepting compound, wherein the color development regulator is hydrophilic, and the composition can change the color thereof in the presence of water or a water-containing liquid. A coloring agent comprising the composition, which composition is retained or carried by a specified microbody and can change its color in the presence of water or a water-containing liquid, wherein the specified microbody allowing water or a water-containing liquid to come into contact with the retained or carried composition.

The present invention relates to a composition comprising a compound of formula (H1) and a compound of formula (H2). The present invention furthermore relates to a formulation comprising a composition comprising a compound of formula (H1) and a formula (H2) and a solvent. Finally, the present invention relates to an electronic device comprising a such a composition.