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An optical device having a layer comprising an organic material that includes a substantially uniform dispersion of light transmissive nanoparticles.

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1. An optical device having a layer comprising an organic semiconductive material that includes a substantially uniform dispersion of light transmissive nanoparticles. 2. An optical device as claimed in claim 1 wherein the diameter of the nanoparticles is generally less than 30 nm. 3. An optical dev

1. An optical device having a layer comprising an organic semiconductive material that includes a substantially uniform dispersion of light transmissive nanoparticles. 2. An optical device as claimed in claim 1 wherein the diameter of the nanoparticles is generally less than 30 nm. 3. An optical device as claimed in claim 1, wherein the presence of the nanoparticles influences at least one material property of the layer. 4. An optical device as claimed in claim 3, wherein the said property is an optical property. 5. An optical device as claimed in claim 4, wherein the said property is refractive index. 6. An optical device as claimed in claim 1, wherein the nanoparticles have a surface coating. 7. An optical device as claimed in claim 6, wherein the surface coating is of a material that influences at least one optical and/or electrical property of the layer, and/or influences the interaction of the nanoparticles with the organic material. 8. An optical device comprising:a layer comprising an organic semiconductive material that includes a substantially uniform dispersion of light transmissive nanoparticles;wherein the nanoparticles have a surface coating of a dye material; andwherein dye material influences at least one optical and/or electrical property of the layer and/or influences the interaction of the nanoparticles with the organic material. 9. An optical device as claimed in claim 8, wherein the dye is a fluorescent dye. 10. An optical device as claimed in claim 1, wherein the organic material is a light-emissive material. 11. An optical device as claimed in claim 8, wherein the dye is a fluorescent dye which is absorbent at an emission frequency of the light-emissive organic material. 12. An optical device comprising:a layer comprising an organic semiconductive material that includes a substantially uniform dispersion of light transmissive nanoparticles, wherein the presence of the nanoparticles influences the refractive index of the organic layer; anda stack of further layers adjacent to the organic layer, the layers defining a light-reflective structure. 13. An optical device as claimed in claim 12, wherein the layers define a distributed Bragg reflector. 14. An optical device comprising:an optical waveguide comprising a relatively high refractive index layer located between two relatively low refractive index layers, at least one of those three layers being a layer comprising an organic semiconductive material that includes a substantially uniform dispersion of light transmissive nanoparticles, wherein the presence of the nanoparticles influences the refractive index of the organic layer. 15. An optical device as claimed in claim 14, wherein the relatively high refractive index layer comprises organic material that includes substantially uniform dispersions of light-transmissive nanoparticles whose presence influences the refractive index of that layer. 16. An optical device as claimed in claim 14, comprising a layer of light-emissive material alongside the waveguide. 17. An optical device as claimed in claim 16, wherein the energy level profile of the device is arranged to encourage light emission in the said layer of light-emissive material. 18. A method for forming an optical device, the method comprising forming a layer comprising an organic semiconductive material that includes a substantially uniform dispersion of light transmissive nanoparticles. 19. An optical device as claimed in claim 1, wherein the presence of the nanoparticles inhibits crystallization of the organic material. 20. An optical device as claimed in any preceding claim 1, wherein the amount of the nanoparticles in the layer comprising an organic material is between 5 and 50 volume %. 21. An optical device as claimed in claim 1, wherein the organic material is a polymer material. 22. An optical device as claimed in claim 1, wherein the organic material is a semiconducting polymer material. 23. An optical device as claimed in claim 21 wherein the organic material is soluble in a polar solvent. 24. A light-emitting device comprising a light-emitting layer located between two waveguide layers having a lower refractive index than the light-emitting layer, and wherein the light-emitting layer and/or the waveguide layers comprises an organic semiconductive material that includes a substantially uniform dispersion of nanoparticles. 25. An optical device comprising a reflective structure having a plurality of layers, each layer comprising a semiconductive conjugated polymer, the refractive indices of adjacent ones of the layers being different, wherein at least one of the layers comprises a substantially uniform dispersion of light transmissive nanoparticles. 26. A light-emitting device comprising a light-emitting layer comprising an organic semiconductive material that includes a substantially uniform dispersion of fluorescent nanoparticles. 27. An optical device as claimed in claim 25, wherein the semiconductive conjugated polymer is doped in an amount less than one tenth of that which would be required to fully dope the semiconductive conjugated polymer. 28. A reflective structure comprising a plurality of layers having alternating refractive indices, each layer comprising a substantially uniform dispersion of nanoparticles.