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(Color online) (a) Schematic cross-section drawing of the lattice around the center. Larger, smaller, and labeled “” circles represent halide ions, alkali ions, and an electron, respectively. (b) Configuration coordinate diagram describing the optical process at the center. (c) Schematic absorption and emission bands of the center in KI around . The values are cited from Ref. 29.
(Color online) Time evolution of luminescence intensity at various photon energies. Intensities are multiplied by appropriate factors and base lines are shifted for clarity.
Long scanned temporal evolution of the luminescence intensity at . (a) Measured data. (b) Non-oscillatory component obtained by smoothing the data in (a) after the time origin using a Gaussian filter with the width of . (c) The lower thick line shows the oscillatory component extracted from the data in (a) by subtracting the non-oscillatory component in (b). The upper thin line indicates a cosine curve with a frequency of without an initial phase.
(Color online) Fourier power spectrum of the oscillating structure of Fig. 3(c).
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