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Related Concept Videos

Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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.
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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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Updated: Jun 30, 2026

Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer
08:27

Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer

Published on: October 1, 2016

Filterless fluorometry with enhanced sensitivity.

Han Yen Tan1, Tuck Wah Ng, Oi Wah Liew

  • 1Department of Mechanical Engineering, Monash University, Clayton, VIC, 3800, Australia.

Journal of Fluorescence
|September 27, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a new fluorometry method using light-emitting diodes (LEDs) without optical filters. The technique enhances measurement sensitivity by reducing excitation light interference with fluorescence signals.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Optical Physics

Background:

  • Fluorometry is a crucial technique for detecting and quantifying fluorescent substances.
  • Traditional fluorometry often relies on optical filters, which can be bulky and expensive.
  • Minimizing excitation light contamination is essential for accurate fluorescence measurements.

Purpose of the Study:

  • To develop a novel, filter-free fluorometry approach using light-emitting diodes (LEDs).
  • To improve measurement sensitivity and reduce excitation light interference.
  • To demonstrate the practicality and effectiveness of the proposed method.

Main Methods:

  • Utilized light-emitting diodes (LEDs) as the excitation light source.
  • Employed light shielding and total internal reflection principles.
  • Operated the system with excitation light applied orthogonal to signal detection.

Main Results:

  • Successfully implemented a filter-free fluorometry system.
  • Significantly reduced excitation light overlap with fluorescence signals at the photodetector.
  • Achieved higher measurement sensitivity for fluorophore emission detection.

Conclusions:

  • The novel LED-based fluorometry approach is practicable and effective.
  • Eliminating optical filters simplifies the system and reduces costs.
  • The method offers enhanced sensitivity for fluorophore analysis.