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Variability in Electron Paramagnetic Resonance (EPR) and Thermoluminescence (TL) signals was found in Gorilla® Glass (GG) smartphone screens. These signals, likely from UV exposure during manufacturing, varied across and within screens.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Analytical Chemistry

Background:

  • Gorilla® Glass (GG) is a widely used protective material in smartphone displays.
  • Understanding the physical properties and potential degradation pathways of GG is crucial for device longevity.
  • Variations in material properties can impact device performance and durability.

Purpose of the Study:

  • To investigate the characteristics of Electron Paramagnetic Resonance (EPR) and Thermoluminescence (TL) signals in various Gorilla® Glass samples.
  • To compare background, radiation-induced, and ultraviolet-induced signals across different GG sources.
  • To identify potential correlations between EPR and TL signals and their origins.

Main Methods:

  • Samples of Gorilla® Glass were obtained from smartphones and online vendors.
  • Electron Paramagnetic Resonance (EPR) spectroscopy was employed to detect paramagnetic species.
  • Thermoluminescence (TL) measurements were performed to assess stored energy after irradiation.

Main Results:

  • Significant variability in both EPR and TL signal shape and intensity was observed among different GG samples and even across the same screen.
  • Background EPR and TL signals were attributed to ultraviolet (UV) exposure during the manufacturing process.
  • Higher signals at screen edges suggested increased UV exposure in those areas.
  • EPR and TL signals exhibited correlated decay patterns with temperature, indicating shared origins.
  • Both hole- and electron-related EPR and TL signals comprised stable and unstable components at room temperature.

Conclusions:

  • Gorilla® Glass exhibits considerable heterogeneity in its EPR and TL properties, influenced by manufacturing processes, particularly UV exposure.
  • The observed correlation between EPR and TL signals suggests a common underlying mechanism related to defects and energy storage within the glass.
  • These findings have implications for understanding the long-term stability and potential degradation of smartphone displays.