Preparation of stable, bright luminescent nanoparticles having compositionally engineered properties

摘要

A method is provided for preparing luminescent semiconductor nanoparticles composed of a first component X, a second component A, and a third component B, wherein X, A, and B are different, by combining B with X and A in an amount such that the molar ratio B:(A+B) is in the range of approximately 0.001 to 0.20 and the molar ratio X:(A+B) is in the range of approximately 0.5:1.0 to 2:1. The characteristics of the thus-prepared nanoparticles can be substantially similar to those of nanoparticles containing only X and B while maintaining many useful properties characteristic of nanoparticles containing only X and A. The nanoparticles so prepared can additionally exhibit emergent properties such as a peak emission energy less than that characteristic of a particle composed of XA or XB alone; this method is particularly applicable to the preparation of stable, bright nanoparticles that emit in the red to infrared regions of the electromagnetic spectrum. Luminescent semiconductor nanoparticles having exemplary properties are also provided.

主权项

1. A dispersion of nanocrystals, comprising
a population of luminescent semiconductor nanocrystals dispersed in an organic solvent system, wherein each nanocrystal in the population comprises a crystalline CdSeTe core and a protective, passivating overlayer, wherein the core comprises CdaSebTec in which the ratio a:(b+c) is in the range of about 0.7 to about 1.5 and the ratio c:(b+c) is in the range of about 0.001 to about 0.20.