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Schematic of the experimental setup.
PL spectra recorded three hours, three days, and three months after sample preparation. The excitation wavelength was 307.5 nm.
UV/visible absorption spectrum. The dotted line is the PLE spectrum for 420 nm luminescence with a maximum at 307.5 nm. The sharp feature at 365 nm belongs to the excitation of the Raman Stokes line at 420 nm.
Schematic of the energy transfer mechanism.
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