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US 2003/0194577 A1Published application
Copolymer
AssigneeCambridge Display Technology Limited
InventorsCarl Towns, Richard O'Dell
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AssigneeCambridge Display Technology Limited
InventorsCarl Towns, Richard O'Dell
Estimating the term…
A copolymer for use in an electroluminescent device comprising a first repeat unit, a second repeat unit comprising a group having a general formula (I) and optionally, a third repeat unit comprising a group having a general formula (II) which may be substituted or unsubstituted where T is a trifluoromethyl substituted benzene; Ar, Ar′ and Ar″ each independently comprise a substituted or unsubstituted aryl or heteroaryl group and m is 1 or 2. 1
A copolymer for use in an electroluminescent device comprising a first repeat unit [Brketopenst]Ar′[Brketclosest], a second repeat unit comprising a group having a general formula I:
A copolymer according to any one of the preceding claims where T is a meta- or para-trifluoromethyl benzene or a meta,meta-trifluoromethyl benzene.
A copolymer according to any one of the preceding claims, wherein Ar′ comprises a substituted or unsubstituted fluorene.
A copolymer according to any one of the preceding claims having an oxidation potential onset in the range from 4.80 eV to 5.80 eV.
A copolymer according to any one of the preceding claims having two or more different oxidation potentials.
Dependencies are inferred from the claim text.
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Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule: derived from organic halides
Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule: derived from five- or six-membered…
Luminescent materials, e.g. electroluminescent or chemiluminescent: containing organic luminescent materials
Organic polymers or oligomers: comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
Term end not estimated
The present invention relates to a copolymer for use in an electroluminescent device and to its preparation and uses.
The basic structure of an electroluminescent device is a light-emissive layer sandwiched between two electrodes. One of the electrodes (the cathode) injects negative charge carriers (electrons) in the light-emissive layer and the other electrode (the anode) injects positive charge carriers (holes) in the light-emissive layers. The electrons and holes combine in the light-emissive layer generating photons. In a practical device, one of the electrodes is typically transparent, to allow the photons to escape the device.
U.S. Pat. No. 4,539,507 discloses an organic light-emissive material which is a small molecule material, such as (8-hydroxyquinolino) aluminium.
The present invention will now be described in further detail with reference to the following drawings in which:
FIG. 1 is a schematic cyclic voltamogram showing the oxidation potential onset (1);
FIG. 2 shows an energy level diagram showing a suggested layering structure for the anode, hole transport layers and light-emissive layer in a device according to the present invention;
The polymer may be conjugated to the extent that localised regions of conjugation exist along the polymer backbone.
Characterisation of the copolymers prepared in Examples 2 to 7 is shown in Table 1.
Preparation of mTFF Monomer