title: Optical control of quantum dot luminescence via photoisomerization of a surface-coordinated, cationic dithienylethene.
abstract: Photoisomerization of a coordinating, photochromic dithienylethene bearing a pyridine and a methylpyridinium group was investigated as a means to reversibly modulate the luminescence from CdSe-ZnS core-shell quantum dots. Resonance energy transfer and electron transfer are both plausible quenching mechanisms based on an increase in the spectral donor-acceptor overlap and an anodic shift in the reduction potential accompanying the isomerization reaction of the dithienylethene photoswitch. Photochemical degradation of both the quantum dot and photochromic quencher was observed after repeated cycling between the two isomers, suggesting irreversible electron transfer from the quantum dot to the dithienylethene as the dominant luminescence quenching mechanism.
authors.affiliation: 4D LABS at Simon Fraser University, 8888 University Drive, Burnaby, BC, CanadaV5A 1S6.
authors.forename: Zach
authors.initials: Z
authors.lastname: Erno
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Yildiz
authors.forename: Brian
authors.initials: B
authors.lastname: Gorodetsky
authors.forename: Françisco M
authors.initials: FM
authors.lastname: Raymo
authors.forename: Neil R
authors.initials: NR
authors.lastname: Branda
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D007536:Isomerism; D049449:Luminescence; D011726:Pyridinium Compounds / Q000737:chemistry*; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013440:Sulfides / Q000737:chemistry; D013876:Thiophenes / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D011726:Pyridinium Compounds; D018036:Selenium Compounds; D013440:Sulfides; D013876:Thiophenes; D017967:Zinc Compounds; C058667:cadmium selenide; C031238:zinc sulfide