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Photoluminescence: Applications

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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Related Experiment Video

Updated: Jun 2, 2026

Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

Published on: December 5, 2025

A device for gated autosynchronous luminescence detection.

Russell Connally¹

¹Macquarie University, Balaclava Road, North Ryde Sydney, NSW, 2109, Australia. russell.connally@mq.edu.au

Analytical Chemistry

|May 11, 2011

Summary

This summary is machine-generated.

A novel gated autosynchronous luminescence detector (GALD) enables sensitive detection of delayed luminescence. This optomechanical instrument allows high-resolution imaging of Giardia lamblia cysts with minimal autofluorescence.

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Area of Science:

Optomechanical instrumentation
Biophotonics
Microscopy

Background:

Delayed luminescence detection (τ > 100 μs) is crucial for sensitive biological imaging.
Existing methods may struggle with autofluorescence and require complex setups.
High-resolution imaging of microorganisms like Giardia lamblia cysts presents specific challenges.

Purpose of the Study:

To develop and characterize a novel optomechanical instrument for sensitive delayed luminescence detection.
To demonstrate the instrument's capability in imaging Giardia lamblia cysts.
To evaluate the performance of the device in terms of signal-to-noise ratio and imaging speed.

Main Methods:

Design and integration of a gated autosynchronous luminescence detector (GALD) into an Olympus BX51 microscope.
Utilizing a compact high-power UV LED as the excitation source.
Employing europium chelate/streptavidin conjugate for indirect labeling of Giardia lamblia cysts.

Main Results:

The GALD device, with dimensions 12x32x90 mm, integrates excitation and detection choppers with a dichroic mirror.
High-resolution color images of labeled Giardia lamblia cysts were captured within seconds, free from autofluorescence.
Time-gated luminescence images achieved a signal-to-noise ratio exceeding 114:1 with 100 ms exposure intervals.

Conclusions:

The GALD is an effective optomechanical instrument for sensitive delayed luminescence detection.
The device facilitates high-resolution, rapid imaging of biological samples with minimal background noise.
GALD offers a promising solution for advanced microscopy applications requiring sensitive luminescence detection.