Dong W.,University of Wuppertal |
Pan Y.,State Key Laboratory of Supramolecular Structure and Materials |
Fritsch M.,University of Wuppertal |
Scherf U.,University of Wuppertal
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2015
Two polytriphenylamines (PTPAs) (P1 and P2) with aggregation induced emission (AIE)-active tetraphenylethylene side groups have been designed and successfully synthesized. Both polymers only faintly emit in dilute solution but show strong emission in aggregated state, meaning that they are AIE-active. The detection of 1,3,5-trinitrobenzene (TNB) vapors has been investigated by photoluminescence (PL) quenching in polymer films. High solid state quantum yields and donor-acceptor interactions of the electron-rich PTPA chains with the TNB analyte, hereby, induce a high sensing sensitivity, both for P1 and P2 films towards TNB vapor. Contacting thin P1 and P2 films with saturated TNB vapor, the PL intensity was quenched by 85% for P1 and 89% for P2 within 600 s, respectively. The sensing process is reversible, >90% of the PL is recovered, also after repeated cycling. © 2014 Wiley Periodicals, Inc.
Deng J.,State Key Laboratory of Supramolecular Structure and Materials |
Tang J.,State Key Laboratory of Supramolecular Structure and Materials |
Xu Y.,State Key Laboratory of Supramolecular Structure and Materials |
Liu L.,State Key Laboratory of Supramolecular Structure and Materials |
And 3 more authors.
Physical Chemistry Chemical Physics | Year: 2015
High and balanced hole and electron mobilities were achieved in OFETs based on the high photoluminescence of a 1,4-bis(2-cyano-2-phenylethenyl)benzene single-crystal with symmetric electrodes. For electron and hole, the operation voltage in the OFETs based on symmetric gold electrodes was 30 and -20 V, respectively. The accumulation threshold voltage is low enough for the OFETs to operate in an ambipolar model with the source/drain voltage (Vds) around 50 V despite the high injection barrier. The highest electron and hole mobility was 0.745 cm2 V-1 s-1 and 0.239 cm2 V-1 s-1, and the current density reached 90.7 and 27.4 A cm-2, respectively with an assumed 10 nm accumulation layer. The high mobility comes from the strong π-π interactions. In addition, the highly ordered hydrogen bonding matrix may create an efficient route to pump the charge to the inner layer which can improve the injection ability. © the Owner Societies 2015.