Organic electroluminescent element
AssigneeMerck Patent GmbH
InventorsKazuhiro Oikawa, Akihiro Kimura
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Abstract
Provided is an organic electroluminescent element having high efficiency, a long lifetime, and bending resistance. An organic electroluminescent element includes a light emitting layer and an electron transport layer adjacent to the light emitting layer between a positive electrode and a negative electrode. A host compound of the light emitting layer has an ionization potential deeper than that of a light emitting dopant of the light emitting layer by 0.3 eV or more. At least one organic compound contained in the electron transport layer has a molecular dipole moment of 6.0 debye or more.
Claims15
An organic electroluminescent element comprising:
- a light emitting layer;
- and an electron transport layer adjacent to the light emitting layer between a positive electrode and a negative electrode, wherein
- a host compound of the light emitting layer has an ionization potential deeper than that of a light emitting dopant of the light emitting layer by 0.3 eV or more and 2.0 eV or less, and
- at least one organic compound contained in the electron transport layer has a molecular dipole moment of 8.0 debye or more and 16.0 debye or less,
- wherein the organic compound is a compound represented by the following general formula (1):
- wherein Z1 and Z2 each represent a pyridine ring which may have a substituent, Z3 represents a simple bond, and R101 represents an aryl group which may have a substituent or an aromatic heterocyclic group which may have a substituent.
Dependencies are inferred from the claim text.