Tuning the Intramolecular Charge Transfer Emission from Deep Blue to Green in Ambipolar Systems Based on Dibenzothiophene <i>S</i>,<i>S</i>-Dioxide by Manipulation of Conjugation and Strength of the Electron Donor Units
作者:Kathryn C. Moss、Konstantinos N. Bourdakos、Vandana Bhalla、Kiran T. Kamtekar、Martin R. Bryce、Mark A. Fox、Helen L. Vaughan、Fernando B. Dias、Andrew P. Monkman
DOI:10.1021/jo100898a
日期:2010.10.15
The efficient synthesis and photophysical propel ties of a series of ambipolar donor acceptor donor Systems is described where the acceptor is dibenzothrophene S,S-dioxide and the donor is fluorene, carbazole or arylamine The systems exhibit intramolecular charge transfer (ICT) states (available ICT character strengths)}editing to fluorescence emission ranging from deep blue to green with model ate to high photoluminescence quantum yields The emission properties can be effectively tuned by systematically changing die 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
The interplay of conformation and photophysical properties in deep-blue fluorescent oligomers
作者:Haiying Li、Andrei S. Batsanov、Kathryn C. Moss、Helen L. Vaughan、Fernando B. Dias、Kiran T. Kamtekar、Martin R. Bryce、Andrew P. Monkman
DOI:10.1039/c0cc00211a
日期:——
We report the synthesis, X-ray crystal structures and photophysics of new donor-acceptor oligomers of fluorene (F) and dibenzothiophene-S,S-dioxide (S) with constrained dihedral angles in the backbone. The materials display bright deep-blue fluorescence and evidence is presented for a planarised intramolecular charge-transfer (PICT) state in the F-S systems.