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Related Concept Videos

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...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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.
Flame Photometry: Lab01:16

Flame Photometry: Lab

In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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Related Experiment Video

Updated: Jun 12, 2026

High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
09:01

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Published on: April 16, 2017

Thermoluminescence measurement technique using millisecond temperature pulses.

Michael E Manfred1, Nicholas T Gabriel, Eduardo G Yukihara

  • 1Department of Electrical Engineering, University of Minnesota, Minneapolis, MN, USA.

Radiation Protection Dosimetry
|June 5, 2010
PubMed
Summary

Pulsed thermoluminescence uses short thermal pulses for material analysis, offering advantages over optical methods. This technique enables efficient, repeatable luminescence measurements on single particles.

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Last Updated: Jun 12, 2026

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

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Thermoluminescence (TL) is a luminescence technique used to study trapped charge carriers in materials.
  • Pulsed optically stimulated luminescence (POSL) offers advantages but requires specific optical setups.
  • Developing alternative pulsed excitation methods for TL is of interest.

Purpose of the Study:

  • To introduce and evaluate a novel pulsed thermoluminescence (PTL) measurement technique.
  • To compare PTL with conventional, ramped TL measurements.
  • To assess the feasibility of PTL for single-particle analysis.

Main Methods:

  • Utilized microstructures with short thermal time constants (approx. 500 μs) to generate rapid temperature pulses.
  • Filled charge carrier traps in alpha-Al(2)O(3):C particles using 205 nm light.
  • Applied 10 and 50 ms temperature pulses to particles on microheaters and recorded luminescence intensity versus temperature.

Main Results:

  • PTL curves showed similar shapes to conventional TL but were shifted to higher temperatures.
  • Single-particle measurements were repeatable with negligible loss of trapped charge population.
  • The minimum effective pulse duration was found to be dependent on particle size and thermal contact.

Conclusions:

  • Pulsed thermoluminescence is a viable technique for studying trapped carriers.
  • PTL offers advantages similar to POSL without requiring optical sources or filters.
  • The technique shows promise for sensitive, repeatable analysis of luminescent materials, particularly at the single-particle level.