Disclosed is an organic electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and a first organic layer disposed between the anode and the cathode, wherein the first organic layer contains a first compound having a structure of Formula 1 and a second compound having a structure of Formula 2. Such a novel material combination composed of the first compound and the second compound may be used in a hole injection layer in the organic electroluminescent device and can endow the organic electroluminescent device with excellent characteristics of low voltage, high efficiency and a long lifetime and provide better device performance. Further disclosed are a display assembly and a compound combination.

Devices and methods relating to stretchable electronics. A stretchable electronic film includes an insulating polymer and less than 1 wt % of a semiconducting polymer. Manufacturing a multi-layered, stretchable electronic device characterized by a single peel-off step for integrating the components of the device rather than a multi-peel synthesis of the device.

The purpose of the present invention is to provide: an organic semiconductor composition suitable for preparing an organic thin film by a solution method, an organic thin film obtained by using the organic semiconductor composition, and a practical field effect transistor which uses the organic thin film. The practical field effect transistor which uses the organic thin film has small variances in mobility and a threshold value, while maintaining a high mobility. Disclosed in the present specification is an organic semiconductor composition including an organic semiconductor compound, an insulation compound, an organic solvent A, which is a good solvent for the insulation compound, and an organic solvent B, which is a poor solvent for the insulation compound and has a higher boiling point than the organic solvent A. The mass ratio a:b of the organic solvent A and the organic solvent B is 1:8 to 8:1.

A compound of Formula I ##STR00001## wherein X.sup.1, X.sup.2, X.sup.3, and X.sup.4 are independently selected from the group consisting of CR.sup.A and N; X.sup.5, X.sup.6, X.sup.7, and X.sup.8 are independently selected from the group consisting of CR.sup.B and N; Y is selected from the group consisting of NR.sup.2, O, S, CR.sup.3R.sup.4, SiR.sup.3R.sup.4 and GeR.sup.3R.sup.4; Z is selected from the group consisting of B, SiR.sup.5, and GeR.sup.6;
wherein R.sup.A and R.sup.B represent mono to the maximum allowable substitution, or no substitution; and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 are independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, silyl, aryl, heteroaryl, acyl, nitrile, and combinations thereof. The compounds of Formula I will have at least one of R.sup.A, R.sup.B, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 that comprises a structure selected from the group consisting of: ##STR00002## wherein X is selected from the group consisting of NR.sup.7, O, S and Se; and X.sup.9-X.sup.41 are each independently selected from the group consisting of C and N; and at least one of X.sup.34-X.sup.41 is N. We also describe an OLED comprising an organic layer that includes a compound of Formula I and a consumer product that includes the OLED.

The present invention relates to an organic electroluminescent device comprising a light-emitting layer B containing at least one host compound H of Formula (I)

##STR00001##

wherein each of X′.sub.1 and X′.sub.2 is independently from another selected from the group consisting of nitrogen and an optionally substituted carbon atom, and wherein at least one of R′.sub.1-R′.sub.10 is CN and at least one of R.sub.A-R.sub.E is a substituted silane residue.

The present invention relates to an organic electroluminescent device comprising a light-emitting layer B containing at least one host compound H of Formula (I)

##STR00001##

wherein each of X′.sub.1 and X′.sub.2 is independently from another selected from the group consisting of nitrogen and an optionally substituted carbon atom, and wherein at least one of R′.sub.1-R′.sub.10 is CN and at least one of R.sub.A-R.sub.E is a substituted silane residue.

Provided are a monoamine compound and an organic electroluminescence device including the same. The monoamine compound according to an example embodiment is represented by the following Formula 1 ##STR00001##

According to the present invention, options for materials for organic devices such as materials for organic EL elements are increased by addition of a cycloalkane, by condensation, to a polycyclic aromatic compound in which a plurality of aromatic rings are linked together by boron atoms, oxygen atoms, and the like. By using a novel cycloalkane-condensed polycyclic aromatic compound as a material for an organic EL element, for example, an organic EL element having excellent emission efficiency and element life is provided.

According to the present invention, options for materials for organic devices such as materials for organic EL elements are increased by addition of a cycloalkane, by condensation, to a polycyclic aromatic compound in which a plurality of aromatic rings are linked together by boron atoms, oxygen atoms, and the like. By using a novel cycloalkane-condensed polycyclic aromatic compound as a material for an organic EL element, for example, an organic EL element having excellent emission efficiency and element life is provided.

An organic electroluminescent device and a display apparatus. The organic electroluminescent device includes a first electrode, a second electrode and an organic layer located between the first electrode and the second electrode. The organic layer includes a light-emitting layer. The light-emitting layer contains a host material, a thermally activated delayed fluorescence sensitizer and a fluorescent dye. The energy level relationship between the host material and the thermally activated delayed fluorescence sensitizer is LUMO.sub.host≥LUMO.sub.sensitizer, while HOMO.sub.sensitizer≥HOMO.sub.host.