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Chinese Science Bulletin

, Volume 58, Issue 22, pp 2728–2732 | Cite as

Effect of bilayer number on the photoluminescent property of TPE-based self-assembled film

  • DiDi Chen
  • Xiao Feng
  • ShangZhi Gu
  • Bin Tong
  • JianBing Shi
  • JunGe Zhi
  • YuPing Dong
Open Access
Letter Special Issue: Molecular Materials and Devices
First Online:
Received:
Accepted:

Abstract

Tetraphenylethylene (TPE) derivatives have been proved to be typical aggregation-induced emission (AIE) luminogens when they were aggregated in the free three-dimensional space. In order to reveal the effect of the dimensional degree on AIE property of TPEs, we utilized tetra(4-hydroxyphenyl)ethylene (TPE-4OH) and 1,4-benzenediamine diazonium salt (BD) to fabricate the ultra-thin films (TPE-4OH/BD LBL SA film) through layer-by-layer self-assembled technique. The interaction between TPE-4OH and BD in the films was converted from electrostatic force and hydrogen-bond to covalent bonds through photodecomposition of diazonium groups under UV irradiation. Fluorescence emission spectroscopy, UV-Vis absorption spectroscopy and atomic force microscope were carried out to evaluate the relationship between bilayer number and photoluminescence of the TPE-based self-assembled films. The experimental results showed that the TPE-based film with three bilayers only displayed AIE character, whereas the fluorescence of the film became randomly changed if the bilayer number was above three. It is supposed that the fluorescence property of the TPE-4OH/BD LBL SA film with limited molecular length in z-axis and infinite aggregation space in x- and y-axis is dominated by two competitive effects, one is the partial restriction of intramolecular rotation through short intermolecular interactions in cross-linked structure of TPE-4OH/BD, and the other is deactivation of its excited state through unrestricted intramolecular rotations or π-π interactions.

Keywords

tetraphenylethylene aggregation-induced emission layer-by-layer self-assembled film 1,4-benzenediamine diazonium salt 
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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • DiDi Chen
    • 1
  • Xiao Feng
    • 1
  • ShangZhi Gu
    • 1
  • Bin Tong
    • 1
  • JianBing Shi
    • 1
  • JunGe Zhi
    • 2
  • YuPing Dong
    • 1
  1. 1.College of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina
  2. 2.College of ChemistryBeijing Institute of TechnologyBeijingChina

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