Highly luminescent color-selective materials

Details Highly luminescent color-selective materials Highly luminescent color-selective materials

C - Chemistry, Metallurgy

09

K

C09K 11/88 (2006.01) C09K 11/54 (2006.01) C09K 11/84 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2309967

A coated nanocrystal capable of light emission includes a substantially monodisperse nanoparticle selected from the group consisting of CdX, where x = S, Se, Te and an overcoating of ZnY, where Y = S, Se, uniformly deposited thereon, said coated nanoparticle characterized in that when irradiated the particles exhibit photoluminescence in a narrow spectral range of no greater than about 60 nm, and most preferably 40 nm, at full width half max (FWHM). The particle size of the nanocrystallite core is in the range of about 2 nm (20.ANG.) to about 12.5 nm (125.ANG.), with a deviation of less than 10 % in the core. The coated nanocrystal exhibits photoluminescence having quantum yields of greater than 30 %.

La présente invention concerne un nanocristal enduit capable de photo-émission et constitué d'une nanoparticule sensiblement monodispersée appartenant au groupe des CdX et recouverte de ZnY uniformément dispersé. En l'occurrence, X est S, Se, Te, et Y est S, Se. La nanoparticule enduite de l'invention est caractérisée en ce que, lorsqu'elles sont soumises à une irradiation, de telles particules font preuve de photoluminescence dans une plage étroite du spectre n'excédant pas, en largeur à mi-hauteur (LMII), 60 nm, et plus préférentiellement 40 nm. Le calibre particulaire du noyau nanocristallin se situe dans une plage allant d'environ 2 nm (20 ANGSTROM ) à environ 12,5 nm (125 ANGSTROM ), avec un écart inférieur à 10% dans le noyau. Ce nanocristal enduit fait preuve d'une photoluminescence dont le rendement quantique est supérieur à 30%.

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