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US 9,812,647 B2Granted
Organic light-emitting device and method
AssigneesCambridge Display Technology Limited, Sumitomo Chemical Company, Limited
InventorsJonathan Pillow, Matthew Roberts, Martina Pintani, Simon King, Michael Cass
Life of this patent
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Abstract
Composition which may be useful in an organic light emitting diode, the composition having a fluorescent light-emitting polymer with light-emitting repeat units, and a triplet-accepting unit mixed with the light-emitting polymer.
Claims17
A composition comprising a fluorescent light-emitting polymer mixed with a triplet-accepting polymer comprising a repeat unit of formula (IIb):
- (TAU-Spacer)m (IIb)
- wherein TAU represents a triplet-accepting unit selected from the group consisting of:
- an anthracene TAU which is unsubstituted or substituted with one or more alkyl groups,
- wherein * denotes the linking points for linking the repeat unit into the polymer chain, Ak is alkyl, and R is H or a substituent;
- Spacer is a spacer group selected from the group consisting of phenylene, biphenylene, and fluorene, and m is at least 2;
- wherein the triplet accepting polymer has a triplet energy level lower than that of the fluorescent light-emitting polymer.
3 more elements
A method, comprising:
- applying a voltage to an organic light-emitting device comprising an anode, a cathode, and a light-emitting layer between the anode and the cathode, wherein the light-emitting layer comprises a composition comprising a fluorescent light-emitting polymer mixed with a triplet-accepting polymer comprising a TAU of formula (IIb):
- (TAU-Spacer)m (IIb)
- wherein TAU represents a triplet-accepting unit selected from the group consisting of:
- an anthracene repeat unit which is unsubstituted or substituted with one or more alkyl groups,
- wherein * denotes the linking points for linking the repeat unit into the polymer chain, Ak is alkyl, and R is H or a substituent;
- Spacer is a spacer group selected from the group consisting of phenylene, biphenylene, and fluorene, and m is at least 2,
- wherein the triplet-accepting unit accepts triplet excitons generated by the light-emitting polymer.
4 more elements
Dependencies are inferred from the claim text.