Patent ID: 8623524
Filing Date: 2014-01-07
Classification: C09K,H01L,H05B,Y10T

Abstract:
1. An organic electroluminescence device comprising: a cathode; an anode; at least one light emitting layer comprising a phosphorescent light emitting material and a host material, which light emitting layer is sandwiched between the cathode and the anode; and an electron injecting layer which comprises an electron injecting layer material and is adhered directly to the light emitting layer; wherein: an ionization potential of the host material is 5.9 eV or smaller; an energy gap of the electron injecting layer material is smaller than that of the host material; and the electron injecting layer material comprises at least one compound selected from the group consisting of compounds represented by formula (A), (B) or (C): wherein n is 1 or 2; when n is 1, L is represented by -L′-Ar L′ is a single bond, a residue of condensed aromatic ring, a residue of aromatic hetero ring, or a residue of uncondensed aromatic ring, each being optionally substituted; Ar Ar Ar each of R and R′ is independently a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group or a heterocyclic group; and wherein Ar Ar at least one of the groups represented by Ar each of L R″ represents a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 60 nuclear carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 60 nuclear carbon atoms, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted alkoxyl group having 1 to 20 carbon atoms; provided that the light emitting layer does not include 4,4′-di(N-carbazolyl)biphenyl.