title: Role of surface ligands in optical properties of colloidal CdSe/CdS quantum dots.
abstract: In order to study the role of surface ligands in determining optical properties of colloidal quantum dots (QDs), we have selectively fabricated and studied CdSe/CdS core-shell QDs with strongly confined electron and hole states attached with commonly used surface ligands. Optical properties, viz. absorption and fluorescence of these QDs, are characterized from which salient changes have been observed for different ligand substitutions which, through theoretical analysis, can be associated with electronic structure properties of the QD-ligand composite systems, in particular localization of wave functions of electrons and holes in the QDs and the band matching of the HOMO-LUMO gap of the ligands. The findings can be utilized to facilitate the understanding and optimization of properties of QD biomarkers with functionalizing surface ligands for targeting cellular objects.
authors.affiliation: Department of Theoretical Chemistry, School of Biotechnology, Royal Institute of Technology, Stockholm, Sweden.
authors.forename: Zhijun
authors.initials: Z
authors.lastname: Ning
authors.forename: Matyas
authors.initials: M
authors.lastname: Molnár
authors.forename: Yun
authors.initials: Y
authors.lastname: Chen
authors.forename: Peter
authors.initials: P
authors.lastname: Friberg
authors.forename: Liming
authors.initials: L
authors.lastname: Gan
authors.forename: Hans
authors.initials: H
authors.lastname: Ågren
authors.forename: Ying
authors.initials: Y
authors.lastname: Fu
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry*; D008024:Ligands; D008956:Models, Chemical; D055620:Optical Phenomena; D055095:Optics and Photonics; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D019187:Cadmium Compounds; D003102:Colloids; D008024:Ligands; D018036:Selenium Compounds; D013440:Sulfides; C034939:cadmium sulfide; C058667:cadmium selenide