The present disclosure relates to an organic compound. The organic compound has a structure as shown in the following formula (1), where R.sub.1 and R.sub.2 are the same as or different from each other, and are each independently substituted or unsubstituted alkyl with 1 to 4 carbon atoms, or substituted or unsubstituted phenyl; each Y is the same or different, and independently has a structure as shown in a formula (2); X.sub.1, X.sub.2, X.sub.3, X.sub.4, and X.sub.5 are the same or different, and are each independently C(R.sub.4) or N, and at least one of X.sub.1, X.sub.2, X.sub.3, X.sub.4, and X.sub.5 is N; m is selected from 1 or 2; and n is selected from 1 or 2. The organic compound of the present disclosure may be used as a hole blocking layer and/or an electron transport layer of an organic electroluminescent device.

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Provided is an organic light-emitting device with improved driving voltage, efficiency, and lifetime, comprising: an anode; a cathode; a light emitting layer between the anode and the cathode; an electron blocking layer between the anode and the light-emitting layer; and a hole transport layer between the electron blocking layer and the anode, wherein the light-emitting layer includes a compound of Formula 1, a compound of Formula 2, and a compound of Formula 3:

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where A is a benzene ring condensed with two adjacent pentagonal rings, B is a benzene ring condensed with two adjacent pentagonal rings, and the other substituents are as defined in the specification.

A foldable structural member and a display device. The foldable structural member includes a structural main body including a first main body and a second main body distributed in a first direction, and a bending portion located between the first main body and the second main body, in which the foldable structural member is enabled to be switched between an unfolding state and a folding state by the bending portion, a buckle assembly, including a first buckle piece and a second buckle piece engaged with the first buckle piece, in which the first buckle piece is arranged on the first main body, and the second buckle piece is arranged on the second main body, in an inward-folding state or an outward-folding state, the first buckle piece is buckled with the second buckle piece to connect the first main body with the second main body.

Provided are a light-emitting device and an electronic apparatus including the light-emitting device, the light-emitting device including: a first compound represented by Formula 1 and a second compound represented by Formula 2; or a first compound represented by Formula 1 and a third compound represented by Formula 1. The detailed description of Formulae 1 and 2 is as described in the present specification

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A device for manufacturing a stretchable substrate structure according to an embodiment includes a carrier substrate receiving portion configured to receive a carrier substrate therein, a stretchable substrate receiving portion configured to receive a stretchable substrate in a direction facing the carrier substrate, and a diaphragm configured to be deformed by air pressure provided on one surface, wherein the diaphragm comes in contact with an entire surface of the stretchable substrate in a plane direction when deformed, such that the stretchable substrate is combined to the carrier substrate by deforming according to the deformed shape of the diaphragm.

A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and at least one functional layer which is disposed between the first electrode and the second electrode, and includes a polycyclic compound represented by Formula 1 below, thereby exhibiting high efficiency and low driving voltage characteristics.

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A light emitting element that includes a first electrode, a first hole transport region on the first electrode, a first emission layer on the first hole transport region, a first electron transport region on the first emission layer, and a second electrode on the first electron transport region is provided. The first hole transport region includes a polycyclic compound represented by Formula 1 and a compound represented by Formula H-1:

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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.

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 invention provides a hydrogel network comprising a plurality of hydrogel objects, wherein each of said hydrogel objects comprises: a hydrogel body, and an outer layer of amphipathic molecules, on at least part of the surface of the hydrogel body, wherein each of said hydrogel objects contacts another of said hydrogel objects to form an interface between the contacting hydrogel objects. A process for producing the hydrogel networks is also provided. The invention also provides an electrochemical circuit and hydrogel component for mechanical devices comprising a hydrogel network. Various uses of the hydrogel network are also described, including their use in synthetic biology and as components in electrochemical circuits and mechanical devices.