A photoelectric conversion element according to an embodiment of the present disclosure includes: a first electrode; a second electrode disposed to be opposed to the first electrode; an organic photoelectric conversion layer provided between the first electrode and second electrode; and a buffer layer provided between the first electrode and the organic photoelectric conversion layer, and including a mellitic acid derivative represented by the general formula (1).

A light-emitting layer for a halide perovskite light-emitting device, a method for manufacturing the same and a perovskite light-emitting device using the same are disclosed. The light-emitting layer can be manufactured by forming a first nanoparticle thin film by coating, on a member, a solution comprising halide perovskite nanoparticles having a halide perovskite nanocrystalline structure. Thereby, a nanoparticle light emitter has therein a halide perovskite having a crystal structure in which FCC and BCC are combined; and can show high color purity. In addition, it is possible to improve the luminescence efficiency and luminance of a device by making perovskite as nanoparticles and then introducing the same into a light-emitting layer.

Small organic molecule semi-conducting chromophores containing a halogen-substituted core structure are disclosed. Such compounds can be used in organic heterojunction devices, such as organic small molecule solar cells and transistors.

A light-emitting layer for a halide perovskite light-emitting device, a method for manufacturing the same and a perovskite light-emitting device using the same are disclosed. The light-emitting layer can be manufactured by forming a first nanoparticle thin film by coating, on a member, a solution comprising halide perovskite nanoparticles having a halide perovskite nanocrystalline structure. Thereby, a nanoparticle light emitter has therein a halide perovskite having a crystal structure in which FCC and BCC are combined; and can show high color purity. In addition, it is possible to improve the luminescence efficiency and luminance of a device by making perovskite as nanoparticles and then introducing the same into a light-emitting layer.

There is provided an imaging device including an upper electrode; a lower electrode; a photoelectric conversion layer disposed between the upper electrode and the lower electrode; and a first organic semiconductor material including an indolocarbazole derivative and disposed between the upper electrode and the lower electrode. Further, there is provided an electronic apparatus including an imaging device that includes an upper electrode; a lower electrode; a photoelectric conversion layer disposed between the upper electrode and the lower electrode; and a first organic semiconductor material including an indolocarbazole derivative and disposed between the upper electrode and the lower electrode.

An imaging device includes a photoelectric conversion element that includes a first electrode, a second electrode facing the first electrode, and a photoelectric conversion layer located between the first electrode and the second electrode; and a charge detection circuit that reads a charge generated in the photoelectric conversion element. The photoelectric conversion layer is a bulk heterojunction layer that contains a phthalocyanine derivative or a naphthalocyanine derivative and a fullerene polymer. In the fullerene polymer, a fullerene or a fullerene derivative is crosslinked by a crosslinking structure represented by general formula (1) below. In general formula (1), X is a bifunctional functional group.

NCH.sub.2XCH.sub.2N  (1)

The present invention is to provide a photoelectric conversion element having an excellent photoelectric conversion efficiency for light in a wide wavelength range and excellent manufacturing suitability. In addition, an imaging element, an optical sensor, and a compound are provided. A photoelectric conversion element includes a conductive film, a photoelectric conversion film, and a transparent conductive film in this order, and the photoelectric conversion film contains a compound represented by Formula (1).

##STR00001##

Provided are an organometallic compound, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound.

An imaging device is provided. The imaging device may include a substrate having a first photoelectric conversion unit and a second photoelectric conversion unit at a light-incident side of the substrate. The second photoelectric conversion unit may include a photoelectric conversion layer, a first electrode, a second electrode above the photoelectric conversion layer, a third electrode, and an insulating material between the third electrode and the photoelectric conversion layer, wherein a portion of the insulating material is between the first electrode and the third electrode.

It is an object of the present invention to provide an organic EL device in which, as a highly efficient and highly durable organic EL material, various materials excelling in electron injection/transport performance, hole blocking performance, hole resistance performance, exciton confinement performance, stability in a film state, and durability, are combined so that properties of each material can be effectively demonstrated, thereby achieving (1) high light emission efficiency and power efficiency, (2) low luminescence starting voltage, (3) low practical driving voltage, and (4) particularly long lifetime. An organic EL device including at least a anode, a hole transport layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and a cathode in this order, characterized in that the hole blocking layer includes a compound having a benzoazole structure represented by the following general formula (1). ##STR00001##
(In the formula, Ar.sup.1 and Ar.sup.2 may be the same or different from each other and each represent a hydrogen atom, a deuterium atom, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted fused polycyclic aromatic group, or a substituted or unsubstituted aromatic heterocyclic group. Y.sub.1 represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted fused polycyclic aromatic group, a substituted or unsubstituted aromatic heterocyclic group, a straight-chained or branched alkyl group that has 1 to 6 carbon atoms and may have a substituent group, a cycloalkyl group that has 5 to 10 carbon atoms and may have a substituent group, or a straight-chained or branched alkenyl group that has 2 to 6 carbon atoms and may have a substituent group. X represents an oxygen atom or a sulfur atom. Z.sub.1 and Z.sub.2 may be the same or different from each other and each represent a carbon atom or a nitrogen atom).