Blue electroluminescent polymer and organic-electroluminescent device using the same
View Patent ↗A blue electroluminescent polymer includes a phenoxazine unit in its polyarylene backbone, and a high-luminance, high-efficiency, stable-performance organic electroluminescent device has an organic layer that includes the blue electroluminescent polymer.
1. A blue electroluminescent polymer of formula (1) below:
where:
Ar is a C 6-26 aromatic group or a C 4-20 heteroaromatic group including at least one heteroatom in the aromatic ring, where the aromatic group or the heteroaromatic group is unsubstituted or substituted with at least one of a C 1-12 alkyl group, a C 1-12 alkoxy group, and —N(R′)(R″) where R′ and R″ are independently a hydrogen atom or a C 1-12 alkyl group;
X is one of O, CH 2 , and S;
R is selected from the group consisting of a hydrogen atom, a C 1-12 linear alkyl group, a C 1-12 branched alkyl group, a C 1-12 alkoxy group, a cyclic C 3-12 alkyl group, and a C 6-14 aromatic group which is unsubstituted or substituted with at least one of a C 1-12 alkyl group, a C 1-12 alkoxy group, and —N(R′)(R″) where R′ and R″ are independently a hydrogen atom or a C 1-12 alkyl group; and
n is a real number ranging from at or between 0.01 and 0.99.
2. The blue electroluminescent polymer of claim 1 , wherein the Ar as a repeating unit has a structure selected from the groups of formula (2) and (3) below:
where R 1 , R 2 , R 3 , and R 4 are independently selected from a group consisting of a C 1-12 alkyl group, a C 1-12 alkoxy group, and —N(R′)(R″) where R′ and R″ are independently a hydrogen atom or a C 1-12 alkyl group.
3. The blue electroluminescent polymer of claim 2 , wherein the Ar unit in the formula (1) is alkylfluorene.
4. The blue electroluminescent polymer of claim 1 , wherein the blue electroluminescent polymer has a weight average molecular weight of 10,000–200,000 and a molecular weight distribution of 1.5–5.
5. The blue electroluminescent polymer of claim 1 , having formula (4) below:
where n is a real number ranging from 0.01 to 0.99.
6. The blue electroluminescent polymer of claim 1 , having formula (5) below:
where n is a real number ranging from 0.01 to 0.99.
7. An organo-electroluminescent device comprising a pair of electrodes and an organic layer between the pair of electrodes, the organic layer comprising blue electroluminescent polymer of formula (1) below:
where:
Ar is a C 6-26 aromatic group or a C 4-20 heteroaromatic group including at least one heteroatom in the aromatic ring, where the aromatic group or the heteroaromatic group is unsubstituted or substituted with at least one of a C 1-12 alkyl group, a C 1-12 alkyl group, a C 1-12 alkoxy group, and —N(R′)(R″) where R′ and R″ are independently a hydrogen atom or a C 1-12 alkyl group;
X is one of O, CH 2 , and S;
R is selected from a group consisting of a hydrogen atom, a C 1-12 linear alkyl group, a C 1-12 branched alkyl group, a C 1-12 alkoxy group, a cyclic C 3-12 alkyl group, and a C 6-14 aromatic group which is unsubstituted or substituted with at least one of a C 1-12 alkyl group, a C 1-12 alkoxy group, and —N(R′)(R″) where R′ and R″ are independently a hydrogen atom or a C 1-12 alkyl group; and
n is a real number ranging from at or between 0.01 and 0.99.
8. The organo-electroluminescent device of claim 7 , wherein the organic layer is an emissive layer.
9. The organo-electroluminescent device of claim 7 , wherein the Ar as a repeating unit has a structure selected from the groups of formula (2) and (3) below:
where R 1 , R 2 , R 3 , and R 4 are independently selected from a group consisting of a C 1-12 alkyl group, a C 1-12 alkoxy group, and —N(R′)(R″) where R′ and R″ are independently a hydrogen atom or a C 1-12 alkyl group.
10. The organo-electroluminescent device of claim 9 , wherein the Ar unit in the formula (1) is alkylfluorene.
11. The organo-electroluminescent device of claim 7 , wherein the blue electroluminescent polymer has a weight average molecular weight of 10,000–200,000 and a molecular weight distribution of 1.5–5.
12. The blue electroluminescent polymer of claim 7 , having formula (4) below:
where n is real number ranging from 0.01 to 0.99.
13. The organo-electroluminescent device of claim 7 , having formula (5) below:
where n is a real number ranging from 0.01 to 0.99.