An OLED multilayer electroluminescent device includes a cathode, an anode, a light-emitting layer (LEL) disposed therebetween, and charge-transporting layers disposed between (A) the cathode and the light-emitting layer, (B) the anode and the light-emitting layer, or (C) both (A) and (B). The light-emitting layer (LEL) includes a host material and an emitter. The host material includes a high-entropy non-crystallizable molecular glass mixture, which includes hole-transporting capabilities, electron-transporting capabilities, or ambipolar capabilities. The ambipolar capabilities include hole-transporting capabilities and electron-transporting capabilities.

Provided is an organic light emitting element having stable performance in the air. The organic light emitting element includes: an anode; a cathode; and a first organic compound layer placed between the anode and the cathode, in which: the organic light emitting element further includes a first organic compound layer placed between the cathode and the emission layer, and a second organic compound layer placed between the emission layer and the first organic compound layer, and brought into contact with the first organic compound layer; the first organic compound layer contains a first organic compound; the second organic compound layer contains a second organic compound; and the first organic compound includes an organic compound represented by the following general formula [1], and the second organic compound includes an organic compound different from the first organic compound ##STR00001##

A compound for an organic photoelectric device is represented by Chemical Formula 1. An organic photoelectric device includes a first electrode and a second electrode facing each other and an active layer between the first electrode and the second electrode, the active layer including the compound represented by Chemical Formula 1.

The present invention relates to organic light emitting elements, comprising thermally activated delayed fluorescence (TADF) emitters and/or hosts on basis of phthalimide and naphthalimide materials, which have a sufficiently small energy gap between S.sub.1 and T.sub.1 (ΔE.sub.ST) to enable up-conversion of the triplet exciton from T.sub.1 to S.sub.1. The organic light emitting elements show high electroluminescent efficiency.

An organic photoelectric conversion element, an imaging device, and an optical sensor, which can detect a plurality of wavelength regions by a single element structure, are provided. The photoelectric conversion element is formed by providing an organic photoelectric conversion portion including two or more types of organic semiconductor materials having different spectral sensitivities between the first and the second electrodes. Wavelength sensitivity characteristics of the photoelectric conversion element change according to a voltage (bias voltage) applied between the first and the second electrodes. The photoelectric conversion element is mounted in the imaging device and the optical sensor.

Novel compounds useful as organic semiconductor material are described. Semiconductor devices containing said organic semiconductor material are also described.

A semiconductor composition for producing a semiconducting layer with consistently high mobility is disclosed. The semiconductor composition includes a diketopyrrolopyrrole-thiophene copolymer and an aromatic non-halogenated hydrocarbon solvent. The copolymer has a structure disclosed within. The aromatic non-halogenated aromatic hydrocarbon solvent contains sidechains having at least 2 carbon atoms and the aromatic ring contains at least 3 hydrogen atoms.

A compound and an organic optoelectronic device are provided. The compound has the chemical formula (I):

##STR00001##

wherein: X.sub.1 to X.sub.5 are independently selected from C and N, when N is selected, a substituent may not be included; R.sub.1 to R.sub.9 are independently selected nom hydrogen, deuterium, C.sub.1 to C.sub.30 alkyl, C.sub.1 to C.sub.30 heteroatom-substituted alkyl, C.sub.6 to C.sub.30 aryl, C.sub.2 to C.sub.30 heteroaryl, and a chemical group A represented by the following chemical formula (II):

##STR00002##

and at least one of R.sub.1 to R.sub.9 is selected from the chemical group A. In the chemical formula (II), R.sub.10 to R.sub.17 are independently selected from hydrogen, deuterium, C.sub.1 to C.sub.30 alkyl, C.sub.1 to C.sub.30 heteroatom-substituted alkyl, C.sub.6 to C.sub.30 aryl, and C.sub.2 to C.sub.30 heteroaryl, and Y is selected from O, S, substituted or unsubstituted imino, substituted or unsubstituted methylene, and substituted or unsubstituted silylene.

Provided are a compound having an excellent semiconductor property and a method for producing the compound, an intermediate of the compound and a method for producing the intermediate, and an organic semiconductor material and an organic semiconductor device each obtained with use of the organic semiconductor material.

A compound represented by general formula (2):

##STR00001## where: A.sup.1 and A.sup.2 are CM.sup.1 or N, and M.sup.1 is H or the like; J.sup.1 and J.sup.2 are each independently a skeleton giving an electron donating property or an electron accepting property; and X.sup.1 and X.sup.2 are

##STR00002## where: M.sup.2 to M.sup.4 are H or the like, and M.sup.3 and M.sup.4 may be bonded to each other to form a ring.

The invention provides a photoelectric conversion element exhibiting excellent photoelectric conversion efficiency even in a case where the photoelectric conversion film is a thin film. Also, the invention provides an optical sensor and an imaging element including the photoelectric conversion element. The invention provides a compound applied to the photoelectric conversion element. The photoelectric conversion element of the invention includes a conductive film, a photoelectric conversion film, and a transparent conductive film, in this order, in which the photoelectric conversion film contains a compound represented by Formula (1). ##STR00001##