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.
Claims20
A light-emitting polymer comprising a light-emitting repeat unit in a backbone of the polymer, wherein the polymer has an anisotropy factor α of no more than 0.8, wherein a transition dipole moment of the light-emitting repeat unit is aligned with the polymer backbone, and wherein the light-emitting repeat unit is a phosphorescent repeat unit comprising a phosphorescent metal complex.
A light-emitting polymer comprising a phosphorescent repeat unit in a backbone of the polymer wherein a transition dipole moment of the phosphorescent repeat unit is aligned with the polymer backbone.
A method of forming a polymer comprising a light-emitting repeat unit in a backbone of the polymer, the method comprising the steps of:
- determining an orientation of a transition dipole moment of a light-emitting unit;
- and
- polymerising the light-emitting unit to form light-emitting repeat units in the polymer backbone,
- wherein the light-emitting unit is polymerised such that the transition dipole moment of the light-emitting unit is aligned with the polymer backbone.
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 0, 1 or 2.
A monomer of formula (Va-m) or (Vb-m):
- 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;
- LG is a leaving group;
- Ar4 is an aryl or heteroaryl group;
- z is 0, 1, 2 or 3;
- L2 is a ligand;
- and n is 0, 1 or 2.
A light-emitting polymer comprising a light-emitting repeat unit comprising a phosphorescent metal complex in a backbone of the polymer wherein:
- the light-emitting repeat unit has a first binding position having a first bond vector, a second binding position having a second bond vector and a transition dipole moment having a transition dipole moment vector;
- an average of a first angle between the first bond vector and the transition dipole moment vector and a second angle between the second bond vector and the transition dipole moment vector is no more than about 30°;
- and
- the polymer has an anisotropy factor α of no more than 0.8.
Dependencies are inferred from the claim text.