87 results about "Electron transport chain" patented technology

A hole injection electrode made of a transparent conductive film is formed on a substrate made of indium-tin oxide (ITO) or the like. On the hole injection electrode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer are formed in order. On the electron injection layer, an electron injection electrode made of aluminum is formed. The light emitting layer includes a first dopant made of a material capable of converting triplet excitation energy to an emission of a predetermined color and a second dopant made of a material capable of converting single excitation energy to an emission of the same color as the predetermined color. The difference between the emission peak wavelength of the first dopant and the emission peak wavelength of the second dopant is preferably 20 nm or less.

Provided are organic n-doped electron transport layers comprising at least one electron transport material and at least one electron rich dopant material and organic p-doped hole transport layers comprising at least one hole transport material and at least one electron deficient dopant material.

To provide an organic electroluminescent element which has low driving voltage, high luminous efficiency and a long service life by combining various materials for organic electroluminescent elements having excellent injection / transport ability for holes and electrons, excellent electron blocking ability, or excellent stability and durability in a thin film state so that the characteristics of respective materials can be effectively exerted as materials for organic electroluminescent elements having high luminous efficiency and high durability. To also provide an organic electroluminescent element wherein low driving voltage is maintained or increase in the driving voltage is effectively suppressed by controlling the doping concentration of an electron acceptor and / or the film thickness of an organic layer that contains an electron acceptor. An organic electroluminescent element which sequentially comprises at least a positive electrode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and a negative electrode in this order, and which is characterized in that the hole injection layer contains an aryl amine compound represented by general formula (1) and an electron acceptor. (In the formula, Ar1-Ar4 may be the same as or different from each other, and each represents a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, or a substituted or unsubstituted condensed polycyclic aromatic group.)