Blue electroluminescent polymer and organic electroluminescence device using the same
A blue electroluminescent polymer comprising diphenylanthracene units in a main chain of polymer and an organic electroluminescence device using the blue electroluminescent polymer, to provide improved luminescent properties.
1. A blue electroluminescent polymer, represented by the following formula (1):
wherein Ar is a C 6-26 aromatic group, or a C 4-14 heteroaromatic group which contains at least one heteroatom in the aromatic ring, where the aromatic group and the heteroaromatic group may be unsubstituted or substituted with at least one a C 1-12 linear, branched or cyclic alkyl group, alkoxy group or amine group; R is a hydrogen atom, a C 1-12 linear, branchec or cyclic alkyl group or alkoxy group, or a C 6-14 aromatic group which may be unsubstituted or subtituted with at least one C 1-12 linear, branched or cyclic alkyl group, alkoxy group or amine group; and n is a real number from 0.01 to 0.99.
2. The blue electroluminescent polymer as set forth in claim 1 , wherein the Ar unit is selected from the group consisting of structures represented by the following formulas (2) and (3):
wherein R 1 and R 2 are independently a C 1-12 linear, branched or cyclic alkyl group, alkoxy group or amine group.
3. The blue electroluminescent polymer as set forth in claim 2 , wherein Ar is anthracene.
4. The blue electroluminescent polymer as set forth in claim 1 , wherein the electroluminescent polymer has a number average molecular weight from 10,000 to 200,000, and a molecular weight distribution from about 1.5 to about 5.
5. An organic electroluminescence device comprising the blue electroluminescent polymer as set forth in claim 1 as a light-emitting layer.
6. An organic electroluminescence device as claimed in claim 5 , wherein the Ar unit is selected from the group consisting of structures represented by the following formulas (2) and (3):
wherein R 1 and R 2 are independently a C 1-12 linear, branched or cyclic alkyl group, alkoxy group or amine group.
7. The organic electroluminescence device as set forth in claim 6 , wherein Ar is anthracene.
8. The organic electroluminescence device as set forth in claim 5 , wherein the electroluminescent polymer has a number average molecular weight from 10,000 to 200,000, and a molecular weight distribution from about 1.5 to about 5.
9. The organic electroluminescence device as claimed in claim 5 , wherein the device has a structure selected from the group consisting of anode/light-emitting layer/cathode, anode/buffer layer/light-emitting layer/cathode, anode/hole transport layer/light-emitting layer/cathode, anode/buffer layer/hole transport layer/light-emitting layer/cathode, anode/buffer layer/hole transport layer/light-emitting layer/electron transport layer/cathode, and anode/buffer layer/hole transport layer/light-emitting layer/hole blocking layer/cathode structure.