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Photoluminescence: Applications01:14

Photoluminescence: Applications

342
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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IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
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Iridium-Based Time-Resolved Luminescent Sensor for Ba2+ Detection.

Ane I Aranburu1, Mikel Elorza1, Pablo R G Valle1,2

  • 1Donostia International Physics Center DIPC, San Sebastián/Donostia E-20018, Spain.

ACS Sensors
|April 11, 2025
PubMed
Summary
This summary is machine-generated.

We developed a novel time-resolved chemosensor for detecting barium ions (Ba2+). This sensor utilizes dual luminescence and distinct decay times to differentiate between free and bound states, enabling precise barium detection.

Keywords:
dual emitteriridiumratiometricsensorstime-resolved luminescence

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Area of Science:

  • Analytical Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Barium ions (Ba2+) play roles in various chemical and biological processes.
  • Accurate detection of Ba2+ is crucial for applications ranging from environmental monitoring to fundamental physics research.
  • Existing methods for Ba2+ detection may lack the sensitivity or specificity required for certain demanding applications.

Purpose of the Study:

  • To introduce a new time-resolved chemosensor for the selective and sensitive detection of barium ions (Ba2+).
  • To leverage dual luminescence and distinct phosphorescence decay kinetics for signal differentiation.
  • To explore the potential application of this sensor in advanced scientific fields, such as neutrinoless double beta decay searches.

Main Methods:

  • Development of an iridium(III) compound exhibiting dual fluorescent and phosphorescent emission.
  • Investigation of luminescence response (intensity and wavelength) upon chelation with Ba2+.
  • Time-resolved luminescence spectroscopy to measure phosphorescence decay constants in free and Ba2+-bound states.
  • Quantum chemical calculations to support experimental observations.

Main Results:

  • The chemosensor exhibits suppressed phosphorescence in its free state and enhanced phosphorescence upon binding Ba2+.
  • Distinct phosphorescence decay times were observed: short for the free sensor (τfree1 ≈ 3.5 ns, τfree2 ≈ 209 ns) and long for the Ba2+-bound sensor (τbound1 ≈ 429 ns, τbound2 ≈ 1128 ns).
  • Time-based analysis allows for effective separation of signals from free and Ba2+-chelated sensor species.

Conclusions:

  • The developed iridium(III) chemosensor provides a robust platform for time-resolved Ba2+ detection.
  • The unique luminescence properties and decay kinetics enable precise discrimination between different sensor states.
  • This sensor holds promise for applications requiring sensitive Ba2+ detection, including potential use in neutrinoless double beta decay experiments.