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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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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
13:51

Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications

Published on: November 10, 2017

pH sensor based on upconverting luminescent lanthanide nanorods.

Li-Ning Sun1, Hongshang Peng, Matthias I J Stich

  • 1Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, D-93040 Regensburg, Germany.

Chemical Communications (Cambridge, England)
|August 12, 2009
PubMed
Summary

This study introduces a novel pH sensor utilizing upconversion luminescence. The sensor integrates specialized nanorods and a pH probe within a hydrogel for accurate measurements.

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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

Published on: November 14, 2015

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Upconversion luminescence offers unique optical properties for sensing applications.
  • Hydrogel matrices provide a versatile platform for integrating nanomaterials and probes.
  • Inner filter effects can be modulated by specific chemical environments.

Purpose of the Study:

  • To develop a novel pH sensor based on upconversion luminescence.
  • To investigate the integration of NaYF(4):Er,Yb nanorods and a pH probe in a hydrogel matrix.
  • To leverage the pH-dependent inner filter effect for sensitive pH detection.

Main Methods:

  • Synthesis of NaYF(4):Er,Yb nanorods.
  • Incorporation of nanorods and a longwave-absorbing pH probe into a hydrogel matrix.
  • Excitation of nanorods with 980-nm laser and analysis of dual emission (green and red).
  • Evaluation of pH-dependent inner filter effects on luminescence.

Main Results:

  • The developed hydrogel sensor exhibits dual emission (green and red) upon excitation.
  • The pH probe induces a measurable, pH-dependent inner filter effect.
  • The combination allows for sensitive pH detection through luminescence modulation.

Conclusions:

  • A novel upconversion luminescence-based pH sensor was successfully fabricated.
  • The sensor effectively utilizes the inner filter effect for pH sensing.
  • This approach offers a promising method for advanced optical pH monitoring.