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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...
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...
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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.
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Updated: May 23, 2026

Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors
06:16

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

Published on: December 5, 2025

Structural changes and relaxations monitored by luminescence.

Y Wang1, B Yang, P D Townsend

  • 1School of Science, China University of Geosciences, Beijing, 100083, China. wyfemail@gmail.com

Luminescence : the Journal of Biological and Chemical Luminescence
|April 19, 2012
PubMed
Summary
This summary is machine-generated.

Luminescence is a powerful tool for detecting crystal phase transitions and structural changes in materials. This technique is sensitive to nanoparticles and ion implantation effects, offering new insights into material science.

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

  • Materials Science
  • Solid-State Physics
  • Spectroscopy

Background:

  • Luminescence is sensitive to structural and compositional changes in crystalline materials.
  • Probe ions like rare earth ions are used to detect local crystal field distortions.
  • Monitoring crystalline phase changes using luminescence is an under-exploited technique.

Purpose of the Study:

  • To provide an overview of using luminescence for monitoring crystalline phase changes.
  • To highlight the sensitivity of luminescence to structural modifications from inclusions and nanoparticles.
  • To explore the impact of ion implantation on crystalline structures.

Main Methods:

  • Continuous scanning of sample temperatures to observe luminescence signatures.
  • Analyzing luminescence response to nanoparticle inclusions (e.g., water, CO2).
  • Investigating luminescence changes induced by high-dose ion implantation.

Main Results:

  • Luminescence provides distinct signatures for phase transitions upon temperature scanning.
  • Luminescence signals are responsive to structural changes caused by nanoparticle inclusions.
  • High-dose ion implantation can induce bulk structural relaxations and changes, an unexpected finding.

Conclusions:

  • Luminescence is a versatile and sensitive technique for studying phase transitions and structural modifications in diverse materials.
  • The influence of nanoparticle inclusions and ion implantation on crystalline structures can be effectively monitored using luminescence.
  • The findings open new avenues for materials characterization and modification via ion implantation.