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US 7,253,452 B2Granted
Blue light emitting semiconductor nanocrystal materials
AssigneeMassachusetts Institute of Technology
InventorsJonathan S. Steckel, John P. Zimmer, Seth Coe-Sullivan, Nathan E. Stott, Vladimir Bulović, Moungi G. Bawendi
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Abstract
A semiconductor nanocrystal includes a core including a first semiconductor material and an overcoating including a second semiconductor material. A monodisperse population of the nanocrystals emits blue light over a narrow range of wavelengths with a high quantum efficiency.
Claims34
A semiconductor nanocrystal comprising:
- a core including a first semiconductor material;
- and
- an overcoating on the core, the overcoating including a second semiconductor material, wherein the nanocrystal is substantially free of deep-trap emission sites, and the nanocrystal when excited emits blue light.
A population of semiconductor nanocrystals, each nanocrystal of the population comprising:
- a core including a first semiconductor material;
- and
- an overcoating on the core, the overcoating including a second semiconductor material, and
- being substantially free of deep-trap emission sites, wherein the population when excited emits blue light.
1 more element
A light emitting device comprising:
- a layer including a matrix;
- a first electrode adjacent to the layer;
- a second electrode opposed to the first electrode;
- and
- a plurality of semiconductor nanocrystals disposed between the first electrode and the second electrode, wherein the semiconductor nanocrystals are substantially free of deep-trap emission sites, and the nanocrystals when excited emit blue light.
2 more elements
Dependencies are inferred from the claim text.