- Synthesis and characterization of fluorene-based oligomers and polymers incorporating N-arylphenothiazine-S,S-dioxide units
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A series of 3,7-bis(9,9-di-n-hexylfluoren-2-yl)-N-arylphenothiazine-S,S- dioxide trimers and (9,9-di-n-octylfluorene-2,7-diyl-co-N-arylphenothiazine-S,S- dioxide) co-polymers, with varying ratios of phenothiazine-S,S-dioxide units, have been prepared in good yields by palladium-catalyzed cross-coupling reactions. The materials are deep blue emitters and show no solvatochromism or evidence for an intramolecular charge-transfer state. The photoluminescence quantum yields of the trimers are φPL 15-30% in solution and 14-25% in films. The polymers demonstrated very high values in solution (φPL 74-84%) and φPL values in films of 28-47%. The estimated HOMO energy levels are between -5.64 and -5.62 eV for the polymers with 15% incorporation of the phenothiazine-S,S-dioxide units. An analogous N-arylphenothiazine co-polymer shows significantly red shifted absorption and emission. Solution electrochemical data and density functional theory calculations are also presented.
- Kamtekar, Kiran T.,Dahms, Katja,Batsanov, Andrei S.,Jankus, Vygintas,Vaughan, Helen L.,Monkman, Andrew P.,Bryce, Martin R.
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p. 1129 - 1137
(2012/02/05)
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- 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
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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.
- Moss, Kathryn C.,Bourdakos, Konstantinos N.,Bhalla, Vandana,Kamtekar, Kiran T.,Bryce, Martin R.,Fox, Mark A.,Vaughan, Helen L.,Dias, Fernando B.,Monkman, Andrew P.
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supporting information; experimental part
p. 6771 - 6781
(2010/12/18)
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- Efficient single-layer electroluminescent device based on a bipolar emitting boron-containing material
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A novel multifunctional 1,6-bis(2-hydroxyphenyl)pyridine boron bis(4-n-butyl-phenyl)phenyleneamine compound in which the hole-transporting (HT), electron-transporting (ET), and emitting (EM) components are integrated into a single molecule was synthesized
- Zhang, Hongyu,Huo, Cheng,Zhang, Jingying,Zhang, Peng,Tian, Wenjing,Wang, Yue
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p. 281 - 283
(2008/02/08)
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- Tunable luminescence of new photochromic bisthienylethenes containing triphenylamine
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Two new photochromic 1,2-bisthienylethenes containing triphenylamine were conveniently prepared; large cyclization quantum yields and obvious fluorescent changes regulated by the photoisomerization were observed. The substitution effect on the photochromic process is discussed based on these systems. CSIRO 2005.
- Luo, Qianfu,Sheng, Saihong,Cheng, Saihe,Tian, He
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p. 321 - 326
(2007/10/03)
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- Synthesis and stability studies of conformationally locked 4-(diarylamino)aryl- and 4-(dialkylamino)phenyl-substituted second-order nonlinear optical polyene chromophores
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A series of chromophores with high second-order nonlinearities has been synthesized; the chromphores consist of triarylamine or dialkylarylamine donors linked by a conformationally locked polyene bridge to a dicyanomethylidene acceptor. The use of bridges
- Staub, Katrin,Levina, Galina A.,Barlow, Stephen,Kowalczyk, Tony C.,Lackritz, Hilary S.,Barzoukas, Marguerite,Fort, Alain,Marder, Seth R.
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p. 825 - 833
(2007/10/03)
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