Patent ID: 8384066

Claim:
A polymer light-emitting device having a light-emitting layer between an anode and a cathode and having a hole transport layer between the light-emitting layer and the anode, characterized in that the hole transport layer is a layer containing a polymer compound comprising a repeating unit represented by the following general formula (I), a repeating unit represented by the following general formula (II) and a repeating unit represented by the following general formula (III): wherein R 1 , R 2 , R 3 and R 4 may be the same or different and each represent a hydrogen atom or an alkyl group; R 5 , R 6 , R 7 and R 8 may be the same or different and each represent an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryloxy group, an arylthio group, an arylalkyl group, an arylalkoxy group, an arylalkylthio group, an arylalkenyl group, an arylalkynyl group, an amino group, a substituted amino group, a silyl group, a substituted silyl group, a halogen atom, an acyl group, an acyloxy group, an imine residue, an amide group, an acid imide group, a monovalent heterocyclic group, a carboxyl group, a substituted carboxyl group, a cyano group or a nitro group; a, b, c and d may be the same or different and each represent an integer of 0 to 3; and when a plurality of R 5 , R 6 , R 7 or R 8 are present, they may be the same or different, —Ar 1 — (II) wherein Ar 1 represents a divalent aromatic amine, and —Ar 2 — (III) wherein Ar 2 represents an arylene group or a divalent heterocyclic group.