An organic light emitting diode can include a reflective electrode, a transparent electrode facing the reflective electrode, a first emitting part including a first emitting material layer, and a second emitting part including a second emitting material layer. The first emitting material layer can be a fluorescent emitting layer comprising a fourth compound as a fluorescent dopant. The second emitting material layer can be a phosphorescent emitting layer comprising a first compound as a phosphorescent dopant. Preferably, a ratio of a second emission peak intensity of the phosphorescent dopant to the first emission peak intensity of the phosphorescent dopant in the second emitting material layer is 0.5 or less. An organic light emitting device can include the organic light emitting diode and can be used in a display device or a lighting device.

An organic light emitting diode can include a reflective electrode, a transparent electrode facing the reflective electrode, and a first emitting part including a first blue emitting material layer and positioned between the reflective electrode and the transparent electrode, a second emitting part including a second blue emitting material layer and positioned between the first emitting part and the transparent electrode, and a charge generation layer positioned between the first and second emitting parts. The first blue emitting material layer includes a fluorescent compound, and the second blue emitting material layer includes a fluorescent compound and a phosphorescent compound. A difference between a second emission peak intensity of the fluorescent compound in the second blue emitting material layer and a second emission peak intensity of the fluorescent compound in the first blue emitting material layer is 0.1 or less.

A light-emitting device and an electronic apparatus including the same are disclosed. The light-emitting device, includes: a first electrode; a second electrode facing the first electrode; and an interlayer arranged between the first electrode and the second electrode, wherein the interlayer includes a first emission layer and a second emission layer, the first emission layer includes a first compound that emits a first light having a first spectrum, the second emission layer includes a second compound that emits a second light having a second spectrum, the first compound includes a first transition metal, the second compound includes a second transition metal, the first transition metal and the second transition metal are different from each other, |HOMO(1)−HOMO(2)| is about 0.05 eV to about 0.4 eV, and |λmax(1)−λmax(2)| is about 0 nm to about 30 nm, wherein HOMO(1), HOMO(2), λmax(1), and λmax(2) are as described herein.

An organic light emitting diode includes an anode, an emission layer disposed on the anode and including a host, a phosphorescent dopant represented by Chemical Formula 1 and a fluorescent dopant represented by Chemical Formula 2, and a cathode disposed on the emission layer. In the organic light emitting diode according to an exemplary aspect of the present disclosure, the emission layer is formed by mixing the fluorescent dopant with the phosphorescent dopant including a substituent as an acceptor at a specific site, thereby energy loss during an emission process can be minimized and energy transfer efficiency can be improved and an organic light emitting diode with improved luminous efficiency and an organic light emitting display device having the same can be provided.

Light-emitting devices comprising light-emitting diodes are described herein. These devices may include a substrate, a reflective anode, a hole-injection layer, a hole-transport layer, an emissive component, an electron-transport layer, a cathode, an enhancement layer, and a light-scattering layer. The emissive component may include first and second fluorescent light-emitting layers with an intervening phosphorescent light-emitting layer or first and second phosphorescent light-emitting layers with an intervening fluorescent light-emitting layer.

An organic light emitting diode includes an anode, an emission layer disposed on the anode and including a host, a phosphorescent dopant represented by Chemical Formula 1 and a fluorescent dopant represented by Chemical Formula 2, and a cathode disposed on the emission layer formed by mixing the fluorescent dopant with the phosphorescent dopant bonded to an acceptor at a specific site, thereby energy loss during an emission process can be minimized and energy transfer efficiency can be improved, and an organic light emitting diode with improved luminous efficiency and an organic light emitting display device having the same can be provided.

An object is to provide a light-emitting element with high emission efficiency. The light-emitting element contains first to third organic compounds. The first organic compound has a function of converting triplet excitation energy into light. The second organic compound has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton. The third organic compound is a fluorescent compound. Light emitted from the light-emitting element is light emitted from the third organic compound that receives excitation energy from the first organic compound or from an exciplex formed by the first and second organic compounds.

An organic light emitting diode can include a reflective electrode, a transparent electrode facing the reflective electrode, and an organic light emitting layer including a first emitting part and a second emitting part and positioned between the reflective electrode and the transparent electrode. Each of the first and second emitting parts includes a phosphorescent emitting layer and a fluorescent emitting layer. In at least one of the first and second emitting parts, the fluorescent emitting layer is positioned to be closer to the transparent electrode than the phosphorescent emitting layer. An organic light emitting device can include the organic light emitting diode and can be a display device or a lighting device.

A small light-emitting device is provided. A light-emitting device which is less likely to produce a shadow is provided. A structure including a switching circuit for supplying a pulsed constant current and a light-emitting panel supplied with the pulsed constant current has been conceived.

Organic light emitting devices (OLEDs) with emissive layers containing both phosphorescent Pt complexes and fluorescent emitters, are described. The devices presented employ both fluorescent and phosphorescent Pt complexes in order to redistribute the excited states to primarily reside on known stable fluorescent emitters to achieve high device operational stability but maintain the high efficiency characteristic of phosphorescent OLEDs.