Abstract: According to one embodiment, a display device includes a first light emitting layer provided in center in plan view, a first metal oxide layer provided on the first light emitting layer, a ring-shaped second light emitting layer provided to surround the first light emitting layer, a second metal oxide layer provided on the second light emitting layer, a ring-shaped third light emitting layer provided to surround the second light emitting layer, a third metal oxide layer provided on the third light emitting layer, and an organic insulating layer which covers the first emitting layer, the second emitting layer, the third emitting layer, the first metal oxide layer, the second metal oxide layer, and the third metal oxide layer.

Abstract: A light-emitting element includes a pixel electrode arranged on an inorganic insulating film having an uneven structure on a first surface, and having a first electrode and a second electrode having an uneven structure finer than the uneven structure on a third surface, an electron injection layer arranged on the second electrode, an electron transport layer arranged on the electron injection layer, a light-emitting layer arranged on the electron transport layer and a common electrode arranged on the light-emitting layer.

Abstract: Disclosed is a light-emitting element including an anode, a first functional layer over the anode, an emission layer over and in contact with the first functional layer, an electron-transporting layer over the emission layer, and a cathode over the electron-transporting layer. The first functional layer includes a first hole-transporting material and a hole-trapping material. The emission layer includes a host material, an emission material, and the hole-trapping material. Concentrations of the hole-trapping material are lower than concentrations of the first hole-transporting material and the host material in the first functional layer and the emission layer, respectively. A highest occupied molecular orbital level of the hole-trapping material is higher than a highest occupied molecular orbital level of the first hole-transporting material and a highest occupied molecular orbital level of the host material.

Abstract: A light emitting element includes a pair of electrodes and first and second organic layers between the pair of electrodes. The second organic layer is adjacent to the first organic layer. The first organic layer includes a first organic material. The second organic layer includes a second organic material. The second organic layer includes a first region and a second region. The first region is in contact with the first organic layer and includes the first organic material.

Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 1.

Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 1.

Abstract: A display device according to an embodiment of the present invention includes an organic light emitting layer including a light emitting material and a thermally activated delayed fluorescence material, wherein a weight percent concentration of the thermally activated delayed fluorescence material in at least one interface portion of the organic light emitting layer is lower than a weight percent concentration of the thermally activated delayed fluorescence material in an intermediate portion positioned between the one interface portion and another interface portion.

Abstract: An organic EL display device according to an embodiment of the present invention includes: a base material; a plurality of pixels; a lower electrode which each of the plurality of pixels is provided with; an organic insulation layer which sections the plurality of pixels; an organic material layer which is disposed on the lower electrode and the organic insulation layer, and includes a plurality of layers; and an upper electrode on the organic material layer. A level difference part is positioned on an upper surface of the organic insulation layer, a first layer included in the organic material layer is divided at the level difference part, or has a thin part being thinner at the level difference part than at a position at which the first layer faces the lower electrode, and a second layer included in the organic material layer is not divided at the level difference part.

Abstract: A heterocyclic compound and an organic electroluminescence device including the same, the heterocyclic compound being represented by Formula 1:

Abstract: An organic EL display device according to an embodiment of the present invention includes: a base material; a plurality of pixels; a lower electrode which each of the plurality of pixels is provided with; an organic insulation layer which sections the plurality of pixels; an organic material layer which is disposed on the lower electrode and the organic insulation layer, and includes a plurality of layers; and an upper electrode on the organic material layer. A level difference part is positioned on an upper surface of the organic insulation layer, a first layer included in the organic material layer is divided at the level difference part, or has a thin part being thinner at the level difference part than at a position at which the first layer faces the lower electrode, and a second layer included in the organic material layer is not divided at the level difference part.

Abstract: A display device includes a first pixel emitting a first color and arranged with a first sub-pixel and a second sub-pixel, the first sub-pixel including a first light emitting element and a second light emitting element, a second pixel emitting a second color different from the first color and next to the first pixel, and a third pixel emitting a third color different from the first color and the second color and next to the first pixel, wherein the first light emitting element and the second light emitting element have mutually different magnitude of current density in which light emitting efficiency is at a peak.

Abstract: A material for an organic electroluminescent device having high emission efficiency is represented by following Formula 1: The material represented by Formula 1 may be included in at least one layer selected from a plurality of layers between an anode and an emission layer of an organic EL device.

Abstract: A heterocyclic compound and an organic electroluminescence device including the same, the heterocyclic compound being represented by Formula 1:

Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 5.

Abstract: A material for an organic electroluminescent device having high emission efficiency is represented by following Formula 1: The material represented by Formula 1 may be included in at least one layer selected from a plurality of layers between an anode and an emission layer of an organic EL device.

Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 1.

Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 5.