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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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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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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Updated: Nov 16, 2025

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Polymer Electrochemiluminescence Featuring Thermally Activated Delayed Fluorescence.

Ping Huang1, Baohua Zhang1, Qiong Hu1

  • 1Centre for Advanced Analytical Science, c/o School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, P. R. China.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|February 24, 2021
PubMed
Summary

Thermally activated delayed fluorescence (TADF) polymers achieve nearly 100% electrochemiluminescence (ECL) efficiency by harvesting all excitons. This breakthrough enhances ECL performance for sensitive bioanalysis and imaging applications.

Keywords:
ECL sensingL-cysteineTADFelectrochemiluminescencepolymer

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Area of Science:

  • Electrochemistry
  • Polymer Science
  • Materials Science

Background:

  • Conjugated polymers/oligomers are used in electrochemiluminescence (ECL) for bioanalysis and imaging.
  • Current ECL efficiency is limited by the theoretical ~25% radiative exciton yield of these materials.

Purpose of the Study:

  • To develop a new ECL system with potentially 100% efficiency using a thermally activated delayed fluorescence (TADF) polymer scaffold.
  • To investigate the mechanisms and applications of TADF polymer-based ECL.

Main Methods:

  • Fabrication and characterization of a TADF polymer scaffold for ECL.
  • Evaluation of different ECL modes (annihilation and co-reactant) using TPrA or S2O82-.
  • Assessment of solid-state ECL sensing for L-cysteine detection.

Main Results:

  • The TADF polymer scaffold enables efficient up-conversion of non-radiative triplet to radiative singlet states, achieving high ECL efficiency.
  • Confirmed annihilation and co-reactant ECL modes distinct from fluorescent polymers.
  • Demonstrated ultralow detection limits, high sensitivity, and good specificity for L-cysteine sensing.

Conclusions:

  • TADF polymer scaffolds offer a promising platform for achieving near-unity ECL efficiency.
  • This approach significantly improves ECL performance over conventional fluorescent polymers.
  • The developed system shows high potential for sensitive and specific ECL-based diagnostics and imaging.