Modified planarizing agents and devices
View Patent ↗A composition comprising: at least one conjugated polymer, at least one second polymer comprising repeat units represented by: (I) optionally, —[CH 2 —CH(Ph-OH)]— and (II) —[CH 2 —CH(Ph-OR)]— wherein Ph is a phenyl ring and R comprises a fluorinated group, an alkyl group, an alkylsulfonic acid group, an alkylene oxide group, or a combination thereof is described. Other polymers can be used as second polymer including polymers comprising modified naphthol side groups. Used in hole injection and hole transport layers for organic electronic devices. Increased lifetime and better processability can be achieved. Versatility with useful OLED emitters can be achieved. Ink formulations can be adapted for ink jet printing. The conjugated polymer can be a polythiophene. Applications include OLEDs and OPVs.
1. A composition for use as a hole injection layer or hole transport layer comprising:
at least one conjugated polymer, wherein the conjugated polymer is a polythiophene,
at least one second polymer having a glass transition temperature of at least 25° C, consisting essentially of repeat units represented by:
(I) —[CH 2 —CH(Ph-OH)]— and
(II) —[CH 2 —CH(Ph-OR)]—
wherein Ph is a phenyl ring and R comprises a fluorinated group.
2. The composition of claim 1 , wherein R comprises a perfluorinated group.
3. The composition of claim 1 , wherein the conjugated polymer is a regioregular polythiophene.
4. The composition of claim 1 , wherein the weight percentage of the second polymer is more than the weight percentage of the first polymer.
5. The composition of claim 1 , wherein the weight percentage of the second polymer is at least six times as much as the weight percentage of the first polymer.
6. The composition of claim 1 , further comprising a solvent carrier.
7. The composition of claim 1 , further comprising a solvent carrier comprising water and at least one second solvent.
8. The composition of claim 1 , wherein the conjugated polymer and the second polymer are soluble.
9. The composition of claim 1 , wherein the molar amount of repeat unit (I) is greater than the molar amount of repeat unit (II).
10. The composition of claim 1 , wherein the molar amount of repeat unit (I) is at least three times the molar amount of repeat unit (II).
11. The composition of claim 1 , wherein the conjugated polymer is a sulfonated polythiophene.
12. The composition of claim 1 , wherein the weight percentage of the second polymer is at least three times as much as the weight percentage of the first polymer.
13. The composition of claim 1 , wherein the weight percentage of the second polymer is at least three times as much as the weight percentage of the first polymer, and wherein the molar amount of repeat unit (I) is at least three times the molar amount of repeat unit (II).
14. A device comprising a composition according to claim 1 .
15. A method of formulating a composition for use as a hole injection layer or hole transport layer comprising:
providing at least one conjugated polymer, wherein the conjugated polymer is a polythiophene,
providing at least one second polymer having a glass transition temperature of at least about 25° C, consisting essentially of repeat units represented by:
(I) —[CH 2 —CH(Ph-OH)]— and
(II) —[CH 2 —CH(Ph-OR)]—
wherein Ph is a phenyl ring and R comprises a fluorinated group, and
mixing the conjugated polymer and the second polymer.
16. The method of claim 15 , wherein the at least one second polymer has a glass transition temperature of at least about 50° C.