Surface structures for enhancement of quantum yield in broad spectrum emission nanocrystals

摘要

Disclosed are inorganic nanoparticles comprising a body comprising cadmium and/or zinc crystallized with selenium, sulfur, and/or tellurium; a multiplicity of phosphonic acid ligands comprising at least about 20% of the total surface ligand coverage; wherein the nanocrystal is capable of absorbing energy from a first electromagnetic region and capable of emitting light in a second electromagnetic region, wherein the maximum absorbance wavelength of the first electromagnetic region is different from the maximum emission wavelength of the second electromagnetic region, thereby providing a Stokes shift of at least about 20 nm, wherein the second electromagnetic region comprises an at least about 100 nm wide band of wavelengths, and wherein the nanoparticle exhibits has a quantum yield of at least about 10%. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

主权项

1. A method of increasing quantum yield of an ultra-small nanocrystal, the method comprising the steps of:
(a) providing the ultra-small nanocrystal by
heating a reaction mixture comprising a source of cadmium or zinc and a molar excess of one or more C4 to C22 alkyl- or aryl-phosphonic acids, andadding to the reaction mixture an injection mixture comprising a C2 to C16 trialkyl- or triarylphosphine and a source of selenium, sulfur, or tellurium; and (b) treating the nanocrystal with a molar excess of acetic acid or a conjugate base thereof.