Abstract: An organic electroluminescent device includes an emission layer interposed between a first electrode and a second electrode. The emission layer may be composed of a host material and a phosphorescent dopant material. The host material may be composed of a mixture of a hole transport material and an electron transport material. The hole transport material may be a carbazole compound and the electron transport material may include at least a compound selected from spirofluorenes and organic metal complexes. The use of the mixture facilitates the re-combination of holes and electrons in neighboring organic layers, thus decreasing the driving voltage and increasing the luminous efficiency and lifetime of the organic electroluminescent device.

Abstract: An organic light emitting device including a first electrode, a second electrode, and an emission layer arranged between the first electrode and the second electrode, the emission layer comprising at least two electron transport materials adapted to serve as a host and a phosphorescent dopant. The use of at least two electron transport materials as a host facilitates the re-combination of holes and electrons in neighboring organic layers, thus improving the luminous efficiency and the lifetime of the organic light emitting device.

Abstract: An organic electroluminescent (EL) device which has a light emitting layer composed of at least one phosphorescent dopant disposed between a first electrode and a second electrode; and a blue light emitting layer contacting the light emitting layer, wherein the light emitting layer has a hole transport material and an electron transport material as a host.

Abstract: An organic light-emitting device is provided. The organic light-emitting device comprises a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode. The device further comprises of a phosphorescent dopant and a phosphorescent host that includes at least two hole transport materials. The mixed phosphorescent host materials increase energy transfer efficiency, thereby improving the efficiency and lifespan of the resulting organic light-emitting device.

Abstract: An organic electroluminescent display device, which has a superior efficiency and life cycle characteristics and maintains constant color coordinates as compared to an existing organic electroluminescent display device, includes at least one emission layer and a charge transport layer between a first electrode and a second electrodes. The emission layer includes at least two or more dopants of a host material. The two or more dopants include a first phosphorescent dopant and a second phosphorescent dopant. Each of the first phosphorescent dopant and second phosphorescent dopant includes iridium or platinum.

Abstract: An organic EL device which has a light emission layer between a pair of electrodes. The light emission layer is formed of a phosphorescent dopant and a host including (i) a carbazole compound and (ii) one or more selected from an oxadiazole compound, a phenanthroline compound, a triazine compound, and a triazole compound. Since the host has both hole transport property and electron transport property, the organic EL device has enhanced emission efficiency and lifetime characteristics even in the absence of a hole-blocking layer.

Abstract: Disclosed is a full color organic electroluminescence display device, comprising a substrate; a first electrode; organic film layers including red, green and blue emission layers and an electron transporting layer; and a second electrode. The thickness of the electron transporting layer, which is preferably formed as a common layer, is different in the red and green emission regions from that in the blue emission region so that the device has an excellent purity of color and improved luminous efficiency of red and green colors.

Abstract: An organic electroluminescent display device improves driving characteristics at a high temperature and storage characteristics of the organic electroluminescent display device, and prevents pixel contraction phenomena of the device by providing an organic electroluminescent display device comprising a substrate, a first electrode and a second electrode formed on the substrate, and an organic film layer comprising at least one emitting layer between the first electrode and the second electrode. The emitting layer includes at least one phosphorescent dopant, and the dopant is represented by L3M or L2ML?, wherein the M is a transition metal selected from the group consisting of Ir, Pt, Zn and Os, the L and L? are bidendate ligands coordinated with carbon and nitrogen, and at least one of the L and L? has 15 or more carbon atoms in the ligand.

Abstract: A flat panel display is provided. The flat panel display includes a substrate, a plurality of first electrodes formed on the substrate, a plurality of insulating layers formed on the substrate, a second electrode insulatingly opposite the first electrodes, and a plurality of organic emission layers interposed between the first electrodes and the second electrode and emitting light by driving of the first electrodes and the second electrode, wherein a region having the insulating layers and an opening region absent of the insulating layers are located between or outside the first electrodes. Using this configuration, damage to the organic emission layers by a gas emitted from the insulating layers can be minimized.

Abstract: An organic electroluminescent display device including a first electrode and a second electrode formed on a substrate, and a plurality of organic film layers between the first and second electrodes, including a first organic film layer provided between the emitting layer and the second electrode, and a second organic film provided between the emitting layer and the first organic film layer, wherein the first organic film layer includes a first organic metal complex compound, and the second organic film layer includes a mixture of a charge carrier transport material and a second organic metal complex compound.

Abstract: An organic electroluminescent display device, which has a superior efficiency and life cycle characteristics and maintains constant color coordinates as compared to an existing organic electroluminescent display device, includes at least one emission layer and a charge transport layer between a first electrode and a second electrodes. The emission layer includes at least two or more dopants of a host material. The two or more dopants include a first phosphorescent dopant and a second phosphorescent dopant. Each of the first phosphorescent dopant and second phosphorescent dopant includes iridium or platinum.

Abstract: An emitting compound for an organic electroluminescent device, and an organic electroluminescent device using the same, supply an effective luminance, an efficient driving voltage, and color purity.