Polymeric compositions comprising quantum dots, optical devices comprising these compositions and methods for preparing same
View Patent ↗The present invention relates to a polymeric composition of matter. The composition includes at least one polymer matrix and plurality of quantum dots distributed therein. The polymer may be a perfluorocyclobutane polymer having high optical transmission at telecommunications wavelengths. The quantum dots may include cap compounds to increase the solubility of the quantum dots in the composition. Typical cap compounds include aromatic organic molecules. Optical devices including waveguides may be fabricated from the polymeric compositions of the invention.
1. A composition of matter, comprising: a polymer matrix including polymer chains having a plurality of carbon-halogen bonds; and a plurality of nanocrystal quantum dots dispersed and separated apart from each other within the polymer matrix, wherein the polymer chains include aromatic groups.
2. The composition of matter of claim 1 , wherein the nanocrystal quantum dots include at least one organic cap compound including at least one aromatic group.
3. The composition of matter of claim 1 , wherein the polymer matrix includes a perfluorocyclobutane polymer.
4. The composition of matter of claim 1 , including a polymer chain having at least 10 repeat units and that is cross linked at least twice to at least one of the other polymer chains.
5. The composition of matter of claim 1 wherein the polymer matrix includes a number N A aliphatic carbon-hydrogen bonds and a number N T total bonds, the ratio N A /N T being less than about 0.4.
6. An optical waveguide including the composition of matter of claim 1 .
7. The composition of matter of claim 1 , wherein the plurality of nanocrystal quantum dots includes a nanocrystal quantum dot having an organic cap compound, in which the organic cap compound includes a halogen.
8. The composition of matter of claim 7 , in which the organic cap compound includes fluorine.
9. The composition of matter of claim 1 , in which the polymer matrix includes a cyclic group having at least 3 carbon atoms.
10. The composition of matter of claim 1 , in which the polymer matrix includes polymer chains having a plurality of carbon-fluorine bonds.
11. The composition of matter of claim 1 , in which the polymer matrix includes a member selected from the group consisting of: poly(fluoroacrylate), poly(tetrafluoroethylene), perfluorovinyl ether copolymer, fluorinated polyimide, and perfluorovinyl ether cyclopolymer.
12. The composition of matter of claim 1 , in which the polymer matrix is prepared from materials including a member selected from the group consisting of:
perfluorocyclobutane,
biphenylene di-perfluorovinyl ether,
1,1,1-tris(para-phenylene perfluorovinyl ether)ethane,
1,1,1-tris(para-phenylene perfluorovinyl ether)-2,2,2-trifluoroethane,
2,2-bis(para-phenylene perfluorovinyl ether)propane,
2,2-bis(para-phenylene perfluorovinyl ether)-1,1,1-3,3,3-hexafluoropropane,
tris(para-phenylene perfluorovinyl ether)-phosphine oxide,
phenyl-bis(para-phenylene perfluorovinyl ether)-phosphine oxide,
9,9-bis(para-phenylene perfluorovinyl ether)-fluorene, and
para-phenylene-di-perfluorovinyl ether.
13. The composition of matter of claim 1 , wherein the polymer matrix includes a number N A aliphatic carbon-hydrogen bonds and a number N H total carbon-hydrogen bonds, the ratio N A /N H being less than about 0.3.
14. The composition of matter of claim 1 , wherein the polymer matrix includes a number N A aliphatic carbon-hydrogen bonds and a number N Hn total carbon-halogen bonds, the ratio N A /N Hn being less than about 0.4.
15. The composition of matter of claim 1 , wherein the plurality of nanocrystal quantum dots is uniformly dispersed within the polymer matrix.
16. The composition of matter of claim 1 , wherein the plurality of nanocrystal quantum dots includes a semiconductor nanocrystal.
17. The composition of matter of claim 16 , wherein the semiconductor nanocrystal includes a compound selected from the group consisting of MgS, MgSe, MgTe, CaS, CaSe, GaTe, SrS, SrSe, SrTe, BaS, BaSe, BaTe, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, GaAs, InGaAs, InP, PbSe, PbS, InAs, or a mixture including two or more of the foregoing.
18. The composition of matter of claim 16 , wherein the semiconductor nanocrystal includes a core, and a shell overlying the core.