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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...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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.
A pair of electrons in a...

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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging
07:41

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Quantum dot photoluminescence lifetime-based pH nanosensor.

Maria J Ruedas-Rama1, Angel Orte, Elizabeth A H Hall

  • 1Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Campus Cartuja, 18071, Granada, Spain. mjruedas@ugr.es

Chemical Communications (Cambridge, England)
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed the first quantum dot (QD) photoluminescence lifetime-based pH nanosensor. This sensitive and selective QD nanosensor accurately measures pH in simulated intracellular environments.

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Area of Science:

  • * Nanotechnology
  • * Materials Science
  • * Analytical Chemistry

Background:

  • * Quantum dots (QDs) are semiconductor nanoparticles with unique optical and electronic properties.
  • * Developing precise and sensitive nanosensors for biological applications is an ongoing challenge.
  • * pH plays a critical role in various cellular processes.

Purpose of the Study:

  • * To develop the first photoluminescence lifetime-based pH nanosensor utilizing Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) core/shell quantum dots.
  • * To evaluate the sensor's performance in terms of linear response range, sensitivity, and selectivity.
  • * To demonstrate the applicability of the nanosensor for pH estimation in simulated intracellular environments.

Main Methods:

  • * Synthesis and characterization of mercaptopropionic acid-capped CdSe/ZnS core/shell quantum dots.
  • * Measurement of quantum dot photoluminescence lifetime as a function of pH.
  • * Testing the nanosensor's response in simulated intracellular media.

Main Results:

  • * The developed CdSe/ZnS quantum dot nanosensor exhibited a linear photoluminescence lifetime response within the pH range of 5.2–6.9.
  • * The nanosensor demonstrated high sensitivity and selectivity for pH estimation.
  • * Successful application of the nanosensor in simulated intracellular media was achieved.

Conclusions:

  • * A novel CdSe/ZnS quantum dot photoluminescence lifetime-based pH nanosensor has been successfully developed.
  • * The nanosensor offers a promising tool for accurate and sensitive intracellular pH monitoring.
  • * This technology has potential applications in biological and biomedical research.