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Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...

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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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Efficient NIR-light emission from solid-state complexes of boron difluoride with 2'-hydroxychalcone derivatives.

Anthony D'Aléo1, David Gachet, Vasile Heresanu

  • 1Aix-Marseille Université, CNRS, CINaM UMR, Campus de Luminy, France. daleo@cinam.univ-mrs.fr

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 31, 2012
PubMed
Summary

New boron difluoride dyes exhibit strong near-infrared (NIR) emission in solid form, defying expectations for crystalline materials. These stable dyes show high quantum yields, making them promising for materials science applications.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic crystals typically suffer from luminescence quenching due to molecular packing.
  • Developing stable, solid-state emitters with strong near-infrared (NIR) emission is a significant challenge.

Purpose of the Study:

  • To synthesize and characterize novel boron difluoride complexes with 2'-hydroxychalcone derivatives.
  • To investigate their photophysical properties, particularly NIR emission in the solid state.
  • To assess their potential as solid-state NIR fluorophores.

Main Methods:

  • Simple synthesis of nine boron difluoride-2'-hydroxychalcone complexes.
  • Spectroscopic analysis (UV-Vis absorption, fluorescence emission) in solution and solid state.
  • Evaluation of photostability and quantum yields.

Main Results:

  • Intense NIR emission observed in the solid state, with emission up to 855 nm.
  • Boron complexation induced strong donor-acceptor character, red-shifting emission.
  • High emission quantum yields achieved in crystalline solids, contrary to conventional understanding.
  • Pyrene-containing dye 4 showed 15% quantum yield and 755 nm emission in solid state.
  • Compounds demonstrated excellent photostability in solution.

Conclusions:

  • Boron difluoride complexes of 2'-hydroxychalcones are effective solid-state NIR emitters.
  • These materials overcome typical luminescence quenching in organic crystals.
  • Their stability and strong NIR emission make them promising for materials science applications.