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The PRLS spectra were obtained by scanning simultaneously
the excitation and emission monochromators of the F-4500
spectrofluorometer (Hitachi, Tokyo, Japan) from 300 to 700 nm
(namely, ¦¤¦Ë ) 0 nm), and all PRLS measurements were made
with a 5.0 nm slit width of the excitation and the emission of the
spectrofluorometer. The PRLS intensity was measured at the
maximum PRLS peak of 555 nm.

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