title: Tuning the intramolecular charge transfer emission from deep blue to green in ambipolar systems based on dibenzothiophene S,S-dioxide by manipulation of conjugation and strength of the electron donor units.
abstract: The efficient synthesis and photophysical properties of a series of ambipolar donor-acceptor-donor systems is described where the acceptor is dibenzothiophene S,S-dioxide and the donor is fluorene, carbazole, or arylamine. The systems exhibit intramolecular charge transfer (ICT) states (of variable ICT character strengths) leading to fluorescence emission ranging from deep blue to green with moderate to high photoluminescence quantum yields. The emission properties can be effectively tuned by systematically changing the position of substitution on both donor and acceptor units (which affects the extent of conjugation) and the redox potentials of the donor units. The results are supported by cyclic voltammetric data and TD-DFT calculations.
authors.affiliation: Department of Chemistry, Durham University, Durham, DH1 3LE, UK.
authors.forename: Kathryn C
authors.initials: KC
authors.lastname: Moss
authors.forename: Konstantinos N
authors.initials: KN
authors.lastname: Bourdakos
authors.forename: Vandana
authors.initials: V
authors.lastname: Bhalla
authors.forename: Kiran T
authors.initials: KT
authors.lastname: Kamtekar
authors.forename: Martin R
authors.initials: MR
authors.lastname: Bryce
authors.forename: Mark A
authors.initials: MA
authors.lastname: Fox
authors.forename: Helen L
authors.initials: HL
authors.lastname: Vaughan
authors.forename: Fernando B
authors.initials: FB
authors.lastname: Dias
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Monkman
mesh_terms: D000588:Amines / Q000737:chemistry*; D002227:Carbazoles / Q000737:chemistry*; D004563:Electrochemistry; D004579:Electron Transport; D005449:Fluorenes / Q000737:chemistry*; D005453:Fluorescence; D056004:Molecular Dynamics Simulation; D015394:Molecular Structure; D010084:Oxidation-Reduction; D011789:Quantum Theory; D013237:Stereoisomerism; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D000588:Amines; D002227:Carbazoles; D005449:Fluorenes; D013876:Thiophenes; C041514:carbazole; C041509:fluorene