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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...

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Related Experiment Video

Updated: Jun 4, 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

Cation substitution engineering persistent luminescence for dynamic optical anti-counterfeiting.

Jia Zhang1, Liyan Zhu1, Pengcheng Ma1

  • 1Physics Department and Jiangsu Key Laboratory of Modern Measurement Technology and Intelligence, Huaiyin Normal University, 111 West Chang Jiang Road, Huai'an 223300, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|June 2, 2026
PubMed
Summary
This summary is machine-generated.

We engineered SrCaBaMgSi2O7 phosphors with tunable colors for advanced optical anti-counterfeiting. Cation substitution allows color tuning from blue to yellow, enhancing security applications.

Keywords:
AnticounterfeitingLong afterglowPhosphorsPhotoluminescence

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence

Background:

  • Long-persistent phosphors emit light after excitation ceases.
  • Tunable luminescence is crucial for advanced optical anti-counterfeiting applications.
  • Developing phosphors with controllable emission colors is a key challenge.

Purpose of the Study:

  • To design and synthesize novel SrCaBaMgSi2O7 phosphors.
  • To achieve tunable luminescence by cation substitution engineering.
  • To explore applications in optical anti-counterfeiting.

Main Methods:

  • Synthesized Sr1.98-y-z Cay Baz MgSi2O7:0.02Dy3+,xEu2+ phosphors.
  • Utilized X-ray Diffraction (XRD) for structural analysis.
  • Investigated luminescence properties and afterglow characteristics.

Main Results:

  • Achieved single-phase phosphors with broad excitation bands (250-450 nm).
  • Tuned Eu2+ emission from blue to yellow via Ca2+ and Ba2+ substitution.
  • Observed doping-concentration-dependent luminescence enhancement and long afterglow.

Conclusions:

  • Cation substitution effectively modifies crystal fields and tunes emission colors.
  • Developed flexible optical anti-counterfeiting devices using these phosphors.
  • Demonstrated enhanced anti-counterfeiting performance with dynamic luminescent patterns.