Preparation of stable, bright luminescent nanoparticles...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 11/89 (2006.01) C09K 11/56 (2006.01) C09K 11/64 (2006.01) C09K 11/70 (2006.01) C09K 11/74 (2006.01) C09K 11/88 (2006.01)

Patent

CA 2550153

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 divided.

L'invention concerne un procédé pour préparer des nanoparticules à semi-conducteurs luminescents comprenant un premier composant X, un deuxième composant A, un troisième composant B, X, A, et B étant différents, par association de B avec X et A en quantité suffisante pour que le rapport molaire B:(A+B) est compris entre 0,001 et 0,20 et que le rapport molaire X:(A+B) est compris entre 0,5 :1,0 et 2 :1. Les caractéristiques desdites nanoparticules peuvent être sensiblement similaires à celles de nanoparticules contenant uniquement X et B, tout en maintenant plusieurs propriétés utiles, caractéristiques des nanoparticules contenant uniquement X et A. Les nanoparticules ainsi obtenues peuvent présenter, de plus, des propriétés émergentes, telles qu'une énergie d'émission de pic inférieure à celle caractéristique d'une particule composée de XA ou XB. Ledit procédé convient en particulier à la préparation de nanoparticules stables, larges qui émettent dans les régions rouges à infrarouges du spectre électromagnétique. Les nanoparticules à semi-conducteurs luminescents de l'invention présentent également des propriétés exemplaires.

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