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Static Electricity-Induced Luminescence Materials for Charge Sensing.

Tomoya Sato¹, Taiga Eguchi¹, Nanami Ishizu^1,2

¹Sensing Technology Research Institute, National Institute of Advanced Industrial Science and Technology, 807-1 Shuku-Machi, Tosu 841-0052, Japan.

Materials (Basel, Switzerland)

|July 15, 2026

Summary

Static electricity-induced luminescence (SEL) materials can power charge-detection sensors. This study quantifies how voltage and SrAl2O4:Eu2+ concentration affect SEL intensity and area, offering insights for sensor design.

Keywords:

SrAl2O4:Eu2+electric charge distribution static electricity static electricity-induced luminescence

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Published on: December 5, 2025

Area of Science:

Materials Science
Solid State Physics
Luminescence Phenomena

Background:

Static electricity-induced luminescence (SEL) materials offer potential for self-powered sensors due to their response to electrical charges.
Understanding the fundamental luminescence mechanisms and material properties of SEL is crucial for developing practical applications.
SrAl2O4:Eu2+ is a promising material for SEL applications, but its behavior requires further quantitative investigation.

Purpose of the Study:

To quantitatively investigate the effects of SrAl2O4:Eu2+ concentration and applied voltage on the luminescence behavior of SEL films.
To elucidate the relationship between material properties, applied voltage, and luminescence characteristics for SrAl2O4:Eu2+ based SEL.
To provide fundamental insights for the design of novel self-powered charge-detection sensors.

Main Methods:

Fabrication of SEL films using SrAl2O4:Eu2+.
Quantitative measurement of luminescence intensity and area under varying applied voltages.
Systematic variation of SrAl2O4:Eu2+ phosphor concentration to assess its impact on luminescence properties.

Main Results:

SEL intensity demonstrated a quadratic dependence on the applied voltage (intensity ∝ voltage^2).
The SEL luminescence area increased monotonically with increasing applied voltage.
Higher SrAl2O4:Eu2+ concentrations led to enhanced luminescence intensity, with no significant impact on the relative change in luminescence area.

Conclusions:

SEL intensity and area correlate with discharge-charge amount and surface charge distribution, respectively.
The findings provide critical data for optimizing SrAl2O4:Eu2+ based SEL materials for charge-detection sensor applications.
This research advances the understanding of SEL mechanisms, paving the way for improved self-powered sensing technologies.