Patent ID: 7709102
Filing Date: 2010-05-04
Classification: C09K,H01L,H05B,Y10S,Y10T

Abstract:
1. An organic electroluminescence device comprising a pair of electrodes and a layer of an organic light emitting medium between the pair of electrodes, wherein the layer of an organic light emitting medium comprises a mixed layer consisting essentially of: (A) at least one compound selected from hole transporting compounds, and (B) at least one compound selected from electron transporting compounds in amounts such that a ratio of an amount of component (A) to an amount of component (B) is in a range of 8:92 to 92:8 and the hole transporting compound and the electron transporting compound satisfy the following formulae 1 to 4 or formulae 1, 2, 5 and 6: wherein Eg1 is an energy gap of the hole transporting compound and Eg2 is an energy gap of the electron transporting compound; wherein IP1 is an ionization energy of the hole transporting compound and IP2 is an ionization energy of the electron transporting compound; wherein Af1 is an electron affinity of the hole transporting compound and Af2 is an electron affinity of the electron transporting compound; wherein ΔEv is IP2−IP1 and ΔEc is Af2−Af1; wherein ΔEc′ is Af1−Af2, and the hole transporting compound is an aromatic amine having a condensed cyclic structure represented by the following general formula (1): wherein Ar 1 to Ar 4 each independently represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 40 carbon atoms or a substituted or unsubstituted aromatic heterocyclic group having 3 to 40 carbon atoms, Y represents a substituted or unsubstituted aromatic residue group having 2 to 60 carbon atoms, at least one of the groups represented by Ar 1 to Ar 4 and Y has a condensed cyclic group having 3 or more rings and a substituent in the groups represented by Ar 1 to Ar 4 and Y may form a ring with two groups selected from the groups represented by Ar 1 to Ar 4 and Y.