Semiconductor nanocrystal display materials and display apparatu

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428328, 428331, 428690, 428691, 428917, 313485, 313486, 313495, 313502, 313503, 313467, 313469, 257102, 257103, 438 34, 438 46, 438 63, 438 73, 427 64, 427 71, H05B 3300, B05D 506, B32B 516

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058827790

ABSTRACT:
A class of high efficiency (e.g., .gtoreq.20%) materials for use as display pixels to replace conventional phosphors in television, monitor, and flat panel displays. The materials are comprised of nanocrystals such as CdS.sub.x Se.sub.1-x, CuCl, GaN, CdTe.sub.x S.sub.1-x, ZnTe, ZnSe, ZnS, or porous Si or Ge alloys which may or may not contain a luminescent center. The nanocrystals may be doped with a luminescent center such as Mn.sup.2+ or a transition metal. The nanocrystals have passivated surfaces to provide high quantum efficiency. The nanocrystals have all dimensions comparable to the exciton radius (e.g., a size in the range of approximately 1 nm to approximately 10 nm). A quantum dot nanocrystal display phosphor that has a size selected for shifting an emission wavelength of a constituent semiconductor material from a characteristic wavelength observed in the bulk to a different wavelength. A field effect flat panel display is described that employs the nanocrystals of this invention, as are embodiments of plasma displays and fluorescent light sources.

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