title: Distance-Dependent Triplet Energy Transfer between CdSe Nanocrystals and Surface Bound Anthracene.
abstract: We investigate triplet energy transfer (TET) across variable-length aromatic oligo-p-phenylene and aliphatic bridges in a covalently linked CdSe nanocrystal (NC)-bridge-anthracene hybrid system. Photon upconversion measurements in saturated 9,10-diphenylanthracene hexane solutions under air-free conditions at room temperature provided the steady-state rate of TET (ket) across this interface. For flexible transmitters, ket is similar for different lengths of aliphatic bridges, suggesting that the ligands bend backward. For the rigid phenylene spacer, triplet sensitization of anthracene transmitter molecules by CdSe NCs shows a strong distance dependence, with a Dexter damping coefficient of 0.43 ± 0.07 Å(-1). The anthracene transmitter bound closest to the NC surface gave the highest quantum yield of 14.3% for the conversion of green to violet light, the current record for a hybrid platform.
authors.affiliation: Department of Chemistry, University of California, Riverside , Riverside, California 92521, United States.
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Chemistry, University of California, Riverside , Riverside, California 92521, United States.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Huang
authors.affiliation: Department of Chemistry, University of California, Riverside , Riverside, California 92521, United States.
authors.forename: Ramsha
authors.initials: R
authors.lastname: Zavala
authors.affiliation: Department of Chemistry, University of California, Riverside , Riverside, California 92521, United States.
authors.forename: Ming Lee
authors.initials: ML
authors.lastname: Tang
mesh_terms: D000873:Anthracenes / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D004735:Energy Transfer; D053758:Nanoparticles / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000873:Anthracenes; D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide; C034020:anthracene