Provided are a condensed cyclic compound having the following structure: ##STR00001##
wherein ring D.sub.1 and ring D.sub.2 are each independently a C.sub.6-C.sub.20 aromatic ring, and an organic light-emitting device including the same.

A compound represented by the following general formula is useful as a light emitting material. Two of R.sup.1 to R.sup.5 each are an aromatic hydrocarbon cyclic group, or a nitrogen atom-containing aromatic heterocyclic group, three of R.sup.1 to R.sup.5 each are a donor group, and at least one thereof is a benzofuran ring-condensed carbazolyl-9-yl group.

##STR00001##

A compound having the following formula ##STR00001##
Formula I, is disclosed. The compound is useful as an emitter in OLED applications.

Provided are a compound for an organic optoelectronic device represented by a combination of Chemical Formula 1 and Chemical Formula 2, a composition for an organic optoelectronic device including the same, an organic optoelectronic device, and a display device. Details for Chemical Formula 1 and Chemical Formula 2 are as defined in the specification.

Disclosed is a light emitting device capable of improving color purity and luminance, reducing a material driving voltage, and exhibiting a longer lifespan by changing the configuration of a green stack. The light emitting device includes a first electrode and a second electrode facing each other, and a light emitting unit including a p-type charge generation layer, a hole transport layer, and a green light emitting layer, which are sequentially stacked, wherein the green light emitting layer includes a triazine-based compound as a host and a phosphorescent dopant.

A light emitting element that includes a first compound represented by a specific chemical formula in which an ortho-type or kind penta-phenyl group is bonded to a fused polycyclic compound including at least one boron atom and a heteroatom is provided. The light emitting element has a long-lifetime.

Disclosed is a light emitting device that is capable of reducing lateral leakage current and a driving voltage by improving a structure for connecting a plurality of stacks to one another in a structure using the plurality of stacks, and a light emitting display device including the same. The light emitting device includes a first electrode and a second electrode facing each other, a plurality of stacks provided between the first electrode and the second electrode, and a charge generation layer including an electron generation layer and a hole generation layer stacked between the stacks, wherein the electron generation layer contains a first host of Formula 1 and a metal dopant, and the hole generation layer contains a second host and an organic dopant.

A light emitting element includes a first electrode, a second electrode, and an emission layer between the first electrode and the second electrode and includes a compound represented by Formula 1 below, thereby exhibiting a long service life characteristic.

##STR00001##

Disclosed are a light emitting device that includes an additional layer adjacent to a light emitting layer and thus is capable of utilizing, in light emission, holes not used in the light emitting layer, to improve efficiency and lifespan, and a light emitting display device including the same. The light emitting device includes a first electrode and a second electrode facing each other, and an unit comprising a hole transport layer, a light emitting layer, an efficiency-improving layer, and an electron transport layer sequentially stacked between the first electrode and the second electrode, wherein the light emitting layer includes a first host comprising an anthracene derivative and a first blue light emitting dopant, and the efficiency-improving layer includes a second host having bipolarity and a second blue light emitting dopant.

A light-emitting device includes an electron transport region including a first electron transport layer and a second electron transport layer. The first electron transport layer includes a first compound, the second electron transport layer includes a second compound, the first compound includes a pyrimidine group, the second compound includes a triazine group, and an absolute value of a lowest unoccupied molecular orbital (LUMO) energy of the first compound (E.sub.LUMO_E1) is less than an absolute value of a LUMO energy of the second compound (E.sub.LUMO_E2). An electronic apparatus including the light-emitting device.