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(Colour on-line) PL spectra of the ZnO bulk crystal at 10 K.
(a, b) (Colour on-line) Decaying traces of the visible luminescence of the sample at different temperatures after ceasing the 385 nm excitation. (c, d) show the recorded time-resolved phosphorescence images at 50 and 150 K, respectively.
(Colour on-line) Variable-temperature PL spectra of the sample under the continuous excitation of 450 nm laser.