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Electrical stimulation for brighter persistent luminescence.

Xilin Ma1, Yuhua Wang2, Takatoshi Seto3

  • 1Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission, Department of Materials Science, School of Materials and Energy, Lanzhou University, No. 222, South Tianshui Road, Lanzhou, Gansu, 730000, China.

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A novel electric field stimulation technique enhances persistent luminescence (PersL) brightness in materials. This method utilizes electron transfer to boost afterglow intensity, offering new insights into PersL mechanisms.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Photophysics

Background:

  • Understanding persistent luminescence (PersL) mechanisms is crucial for developing brighter persistent luminescent materials (PersLMs).
  • Current knowledge limitations hinder the design of advanced PersLMs.

Purpose of the Study:

  • To investigate the effect of an external electric field on the persistent luminescence properties of SrAl2O4:Eu2+,Dy3+ phosphor.
  • To elucidate the mechanism behind the observed enhancement in afterglow brightness.

Main Methods:

  • In-situ direct current (DC) electric field measurements on a SrAl2O4:Eu2+,Dy3+ phosphor-electrode structure.
  • Analysis of photoluminescence (PL) and afterglow properties under varying voltage.
  • Thermoluminescence (TL) spectroscopy to study trapped charge carriers.
  • Rate equation modeling to illustrate electron transfer dynamics.

Main Results:

  • A novel phenomenon termed "external electric field stimulated enhancement of initial brightness of afterglow" was observed.
  • Applied voltage significantly increased PersL intensity.
  • Electrons trapped in ultra-shallow traps (0.022 eV) were shown to transfer via the conduction band.
  • Afterglow intensity reached 0.538 cd·m⁻² at 6 V.

Conclusions:

  • An electric field stimulation technique effectively enhances PersL intensity in materials.
  • The study provides a new perspective on the fundamental mechanics of PersLMs.
  • This approach opens avenues for designing and optimizing future PersLMs.