Polymer and organic light-emitting device

摘要

A composition comprises a phosphorescent compound of formula (I) and a polymer comprising a repeat unit of formula (II) Ar1 is an aryl or heteroaryl group; R2 is a substituent; A is independently in each occurrence N or CR3 wherein R3 is H or a substituent; M is a transition metal or metal ion; x is a positive integer of at least 1; y is 0 or a positive integer; LI is a mono- or polydentate ligand; RI is a substituent; z is 0 or a positive integer; X is 0 or S. The phosphorescent compound of formula (I) may be mixed with the polymer or may be covalently bound thereto. The composition may be used in the light-emitting layer between the anode and the cathode of an organic light-emitting device.