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Adding memory to pressure-sensitive phosphors

Robin Petit (UGent) , Simon Michels (UGent) , Ang Feng (UGent) and Philippe Smet (UGent)
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An embedded network of sensors in composites for local sensing (Enclose)
Abstract
Mechanoluminescence (ML) is the phenomenon describing the emission of light during mechanical action on a solid, leading to applications such as pressure sensing, damage detection and visualization of stress distributions. In most cases, this mechanical action releases energy that was previously stored in the crystal lattice of the phosphor by means of trapped charge carriers. A drawback is the need to record the ML emission during a pressure event. In this work, we provide a method for adding a memory function to these pressure-sensitive phosphors, allowing an optical readout of the location and intensity of a pressure event in excess of 72 h after the event. This is achieved in the BaSi2O2N2:Eu2+ phosphor, where a broad trap depth distribution essential for the process is present. By merging optically stimulated luminescence (OSL), thermoluminescence (TL) and ML measurements, the influence of light, heat and pressure on the trap depth distribution is carefully analysed. This analysis demonstrates that mechanical action can not only lead to direct light emission but also to a reshuffling of trap occupations. This memory effect not only is expected to lead to new pressure sensing applications but also offers an approach to study charge carrier transitions in energy storage phosphors.
Keywords
PERSISTENT LUMINESCENCE, STRESS-DISTRIBUTION, CRACK-PROPAGATION, MECHANOLUMINESCENCE, VISUALIZATION

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Citation

Please use this url to cite or link to this publication:

MLA
Petit, Robin, et al. “Adding Memory to Pressure-Sensitive Phosphors.” LIGHT - SCIENCE & APPLICATIONS, vol. 8, no. 1, 2019.
APA
Petit, R., Michels, S., Feng, A., & Smet, P. (2019). Adding memory to pressure-sensitive phosphors. LIGHT - SCIENCE & APPLICATIONS, 8(1).
Chicago author-date
Petit, Robin, Simon Michels, Ang Feng, and Philippe Smet. 2019. “Adding Memory to Pressure-Sensitive Phosphors.” LIGHT - SCIENCE & APPLICATIONS 8 (1).
Chicago author-date (all authors)
Petit, Robin, Simon Michels, Ang Feng, and Philippe Smet. 2019. “Adding Memory to Pressure-Sensitive Phosphors.” LIGHT - SCIENCE & APPLICATIONS 8 (1).
Vancouver
1.
Petit R, Michels S, Feng A, Smet P. Adding memory to pressure-sensitive phosphors. LIGHT - SCIENCE & APPLICATIONS. 2019;8(1).
IEEE
[1]
R. Petit, S. Michels, A. Feng, and P. Smet, “Adding memory to pressure-sensitive phosphors,” LIGHT - SCIENCE & APPLICATIONS, vol. 8, no. 1, 2019.
@article{8641196,
  abstract     = {Mechanoluminescence (ML) is the phenomenon describing the emission of light during mechanical action on a solid,
leading to applications such as pressure sensing, damage detection and visualization of stress distributions. In most
cases, this mechanical action releases energy that was previously stored in the crystal lattice of the phosphor by means
of trapped charge carriers. A drawback is the need to record the ML emission during a pressure event. In this work, we
provide a method for adding a memory function to these pressure-sensitive phosphors, allowing an optical readout of
the location and intensity of a pressure event in excess of 72 h after the event. This is achieved in the BaSi2O2N2:Eu2+
phosphor, where a broad trap depth distribution essential for the process is present. By merging optically stimulated
luminescence (OSL), thermoluminescence (TL) and ML measurements, the influence of light, heat and pressure on the
trap depth distribution is carefully analysed. This analysis demonstrates that mechanical action can not only lead to
direct light emission but also to a reshuffling of trap occupations. This memory effect not only is expected to lead to
new pressure sensing applications but also offers an approach to study charge carrier transitions in energy storage
phosphors.},
  articleno    = {124},
  author       = {Petit, Robin and Michels, Simon and Feng, Ang and Smet, Philippe},
  issn         = {2047-7538},
  journal      = {LIGHT - SCIENCE & APPLICATIONS},
  keywords     = {PERSISTENT LUMINESCENCE,STRESS-DISTRIBUTION,CRACK-PROPAGATION,MECHANOLUMINESCENCE,VISUALIZATION},
  language     = {eng},
  number       = {1},
  pages        = {10},
  title        = {Adding memory to pressure-sensitive phosphors},
  url          = {http://dx.doi.org/10.1038/s41377-019-0235-x},
  volume       = {8},
  year         = {2019},
}

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