Highly luminescent color-selective nanocrystalline materials
A nanocrystal capable of light emission includes a nanoparticle having photoluminescence having quantum yields of greater than 30%.
1. A composition comprising a population of nanocrystals, wherein each nanocrystal of the population comprises a core including a first semiconductor material and an overcoating including a second semiconductor material deposited on the core, wherein the population exhibits photoluminescence having a quantum yield of at least 30% and emit light in a spectral range of about 37 nm or less full width at half max (FWHM) when irradiated.
2. The population of claim 1 , wherein the population exhibits photoluminescence having a quantum yield of at least 40%.
3. The population of claim 1 , wherein the population exhibits photoluminescence having a quantum yield of about 50%.
4. The population of claim 1 , wherein the core is CdSe.
5. The population of claim 4 , wherein overcoating is ZnS.
6. The population of claim 5 , wherein the FWHM is 30 nm or less.
7. The population of claim 4 , wherein overcoating comprises ZnS.
8. The population of claim 7 , wherein the FWHM is 30 nm or less.
9. The population of claim 4 , wherein the FWHM is 30 nm or less.
10. The population of claim 1 , wherein the core comprises CdSe.
11. The population of claim 10 , wherein overcoating is ZnS.
12. The population of claim 11 , wherein the FWHM is 30 nm or less.
13. The population of claim 10 , wherein overcoating comprises ZnS.
14. The population of claim 13 , wherein the FWHM is 30 nm or less.
15. The population of claim 10 , wherein the FWHM is 30 nm or less.
16. The population of claim 1 , wherein overcoating is ZnS.
17. The population of claim 16 , wherein the FWHM is 30 nm or less.
18. The population of claim 1 , wherein overcoating comprises ZnS.
19. The population of claim 18 , wherein the FWHM is 30 nm or less.
20. The population of claim 1 , wherein the FWHM is 30 nm or less.
21. The population of claim 1 , wherein the cores of the population have diameters of no greater than 5% rms deviation.
22. A composition comprising a population of nanocrystals, wherein each nanocrystal of the population comprises a core including a first semiconductor material and an overcoating including a second semiconductor material deposited on the core, wherein the population exhibits photoluminescence having a quantum yield of at least 30% and wherein the cores of the population have diameters having no greater than 5% rms deviation, wherein the population of nanocrystals emit light in a spectral range of no greater than 37 nm full width at half max (FWHM) when irradiated.
23. The composition of claim 22 , wherein the population of nanocrystals emit light in a spectral range of no greater than about 30 nm full width at half max (FWHM) when irradiated.
24. A composition comprising a population of nanocrystals, wherein each nanocrystal of the population comprises a core including a first semiconductor material and an overcoating including a second semiconductor material deposited on the core, wherein the population exhibits photoluminescence having a quantum yield of at least 40%, wherein the population of nanocrystals emit light in a spectral range of no greater than 37 nm full width at half max (FWHM) when irradiated.
25. The composition of claim 24 , wherein the cores of the population have diameters having no greater than 10% rms deviation.
26. The composition of claim 25 , wherein the cores of the population have diameters having no greater than 5% rms deviation.
27. The composition of claim 26 , wherein the % rms deviation is determined at room temperature.
28. The composition of claim 25 , wherein the % rms deviation is determined at room temperature.
29. The composition of claim 24 , wherein the population of nanocrystals emit light in a spectral range of no greater than about 30 nm full width at half max (FWHM) when irradiated.
30. The composition of claim 29 , wherein the FWHM is determined at room temperature.
31. The composition of claim 24 , wherein the FWHM is determined at room temperature.