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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Fluorene-containing tetraphenylethylene molecules as lasing materials.

C Orofino1, C Foucher2, F Farrell1

  • 1WestCHEM, Department of Pure and Applied Chemistry University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK.

Journal of Polymer Science. Part A, Polymer Chemistry
|August 8, 2017
PubMed
Summary
This summary is machine-generated.

Star-shaped oligofluorene molecules with a TPE core exhibit aggregation-induced emission (AIE), becoming efficient luminogens in condensed states. Compound 4 was used to create an organic DFB laser, showing potential for lasing-based pressure sensors.

Keywords:
Synthesisaggregation induced emissionoligomersphotophysicspiezofluorochromism

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Aggregation-induced emission (AIE) is a phenomenon where molecules are non-emissive in solution but become highly luminescent in the aggregated or solid state.
  • Oligofluorenes are promising materials for optoelectronic applications due to their tunable electronic properties.

Purpose of the Study:

  • To design and synthesize novel star-shaped oligofluorene molecules with a tetraphenylethylene (TPE) core exhibiting AIE.
  • To investigate the impact of varying arm lengths and terminal groups on the AIE properties.
  • To explore the potential of these materials in organic lasers and pressure sensing applications.

Main Methods:

  • Synthesis of star-shaped oligofluorene molecules with TPE cores.
  • Characterization of photophysical properties, including fluorescence spectroscopy in different solvent mixtures (THF/H2O).
  • Fabrication and testing of an all-organic distributed feedback (DFB) laser using compound 4 as the gain medium.
  • Piezofluorochromism studies on thin films to assess pressure-dependent emission.

Main Results:

  • Synthesized star-shaped oligofluorenes with TPE cores demonstrated effective AIE, transitioning from poor emitters in solution to efficient yellow-green luminogens in the condensed state.
  • The AIE properties were tunable based on the number of fluorene units and terminal groups.
  • An all-organic DFB laser fabricated with compound 4 showed efficient green emission with a low threshold energy fluence (60 ± 6 μJ/cm²).
  • Piezofluorochromism studies revealed a linear pressure dependence of the amplified spontaneous emission (ASE) peak, indicating potential for pressure sensing.

Conclusions:

  • The designed star-shaped oligofluorenes are effective AIE materials with tunable properties.
  • Compound 4 shows significant potential as a gain medium for organic lasers.
  • The observed piezofluorochromic behavior suggests these materials could be utilized in novel lasing-based pressure sensors.