A simple and versatile route to stable quantum dot-dye hybrids in nonaqueous and aqueous solutions.
Hybrid systems consisting of core/shell semiconductor quantum dots (QDs) and organic rylene dyes have been prepared and characterized. Complex formation is mediated by bidentate carboxylate moieties covalently linked to the dye molecules. The complexes were very stable with respect to time (at least months), dilution (sub nM), and precipitation. After preparation in organic solvent, complexes could be easily transferred into water. The strong quenching of QD emission by the dye molecules (transfer efficiencies up to 95%) was satisfactorily modeled by an FRET process. Single complexes immobilized in thin polymer films were imaged by confocal fluorescence microscopy.
Ren
Ting
T
Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz, Welderweg 11, 55099 Mainz, Germany.
Mandal
Prasun K
PK
Erker
Wolfgang
W
Liu
Zhihong
Z
Avlasevich
Yuri
Y
Puhl
Larissa
L
Müllen
Klaus
K
Basché
Thomas
T