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2005
Luminescence
D 6540
CdSe/CdS/ZnS and CdSe/ZnSe/ZnS Core—Shell—Shell Nanocrystals. — Highly
luminescent colloidal title nanocrystals are synthesized from Cd(OAc)2, (TOP)Se, and
10- 006 H
2S in a hexadecylamine—tri-n-octylphosphine oxide—tri-n-octylphosphine (TOP)
stabilizing mixture. The samples are characterized by powder XRD, UV/VIS, photoluminescence spectroscopy, and TEM. Due to the high quality of the ZnS shell, the
core—shell—shell (CSS) nanocrystals exhibit photoluminescence efficiency and
photostability exceeding those of CdSe/ZnS nanocrystals. Preferential growth of the
middle CdS shell in one crystallographic direction allows engineering the shape and
luminescence polarization of the CSS nanocrystals. Another advantage of CSS nanocrystals compared to conventional core—shell nanocrystals might be their potentially
lower toxicity in biological applications due to better protection of the surrounding
medium from the toxic elements present in the emitting CdSe core by the nontoxic ZnS
shell. — (TALAPIN*, D. V.; MEKIS, I.; GOETZINGER, S.; KORNOWSKI, A.;
BENSON, O.; WELLER, H.; J. Phys. Chem. B 108 (2004) 49, 18826-18831; Inst.
Phys. Chem., Univ. Hamburg, D-20146 Hamburg, Germany; Eng.) — W. Pewestorf
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