Electroluminescent compositions
The present invention relates to compositions capable of emitting circularly polarized electroluminescence comprising an electroluminescent polymer and a chiral dopant, processes for the synthesis of such compositions and light emitting devices incorporating such compositions.
1. A composition comprising an electroluminescent polymer and a scalemic chiral dopant.
2. The composition of claim 1 , wherein the chiral dopant is a helical compound.
3. The composition of claim 1 , wherein the chiral dopant is a helicene, a helicenoidal compound, a helical peptide or a DNA molecule.
4. The composition of claim 1 , wherein the chiral dopant is an axially chiral biaryl compound.
5. The composition of claim 1 , wherein the chiral dopant is 1-aza[6]helicene or 7-helicene.
6. The composition of claim 1 , wherein the chiral dopant has a M W of up to 4000.
7. The composition of claim 1 , wherein the electroluminescent polymer is a polymer, the electroluminescence of which in the absence of chiral dopant is not circularly polarized.
8. The composition of claim 1 , wherein the electroluminescent polymer is an achiral electroluminescent polymer.
9. The composition of claim 1 , wherein the electroluminescent polymer is a polyfluorene or poly(p-phenylene vinylene) derivative.
10. The composition of claim 9 , wherein the electroluminescent polymer is poly[9,9-dioctylfluorene-co-benzothiadiazole].
11. The composition of claim 1 , wherein the chiral dopant is present within the composition at a doping ratio of up to 55% (by weight).
12. The composition of claim 11 , wherein the chiral dopant is present at a doping ratio of 0.1 to 55%.