Organic light emitting polymer comprising light-emitting repeat unit in backbone of polymer and device therewith
AssigneesCambridge Display Technology Limited, Sumitomo Chemical Company, Limited
InventorsRuth Pegington, Michael Cass, David Mohamad, Matthew Roberts, William Tarran, Martin Humphries
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Abstract
A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy of no more than 0.8 and wherein a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone.
Claims12
A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy factor a of no more than 0.8, a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone, and the light-emitting repeat unit is a phosphorescent repeat unit comprising a phosphorescent metal complex;
- wherein the light-emitting repeat unit has formula (Va) or (Vb):
- wherein M is a metal;
- Ar5 is an aromatic group;
- each X is independently N or CR14 wherein R14 independently in each occurrence is H or a substituent and two groups R14 bound to the same ring may be linked to form a ring;
- each Y is independently N or CR15 wherein each R15 independently is H or a substituent;
- L2 is a ligand which is different from
- of formula (Va) or
- of formula (Vb);
- and n is 1.
A light-emitting polymer comprising a phosphorescent light-emitting repeat unit of formula (Va) or (Vb):
- wherein M is a metal;
- Ar5 is an aromatic group;
- each X is independently N or CR14 wherein R14 independently in each occurrence is H or a substituent and two groups R14 bound to the same ring may be linked to form a ring;
- each Y is independently N or CR15 wherein each R15 independently is H or a substituent;
- L2 is a ligand which is different from
- of formula (Va) or
- of formula (Vb);
- and n is 1.
Dependencies are inferred from the claim text.