The analysis used in this study demonstrated an ability to detect characteristics of tooth brushing motion, showing tooth brushing motion to change depending on the brushed location. These results also suggest that more detailed instructions might be required according to patient's oral condition.

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Ce3+ ion is an important activator for various phosphors, but no detailed study has been performed on KCl:Ce3+. A Ce3+-doped KCl blue phosphor is synthesized from an aqueous solution of KCl − CeCl3. The structural and optical properties of the KCl:Ce3+ phosphor are investigated by X-ray diffraction (XRD) analysis, photoluminescence (PL) analysis, PL excitation spectroscopy, diffuse reflectance spectroscopy, and luminescence decay measurement. The XRD data indicate that the KCl host lattice can be expanded when Ce atoms are incorporated. The phosphor exhibits a blue emission doublet at ∼400 nm, which is characteristic of the 5d → 4f transitions in Ce3+. The dependence of the PL intensity on the Ce3+ concentration up to 23 mol% and that on the lattice temperature in the T = 20 − 450 K range are measured and analyzed in detail. An increase in the luminescence decay time with increasing emission wavelength is also observed.

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