(Color online) Temporal evolution of the PL spectrum of NPs placed on the surface under continuous excitation with (a) and (b) . The intervals of the plot in (b) are twice as large as in (a). Bars on the axis indicate the peak position of each spectrum.
(Color online) Temporal change in (a) the normalized PL intensity (the integrated area of the PL spectrum in Fig. 1) in a semilogarithmic plot and (b) peak energy and FWHM. The excitation wavelengths are 365 and , as indicated in the figure. The lines in (a) were obtained by fitting calculations, whereas the lines in (b) serve guide to the eyes.
(Color online) PL spectrum obtained with continuous excitation of in ambient air and in UHV (initial and after ). The vertical lines indicate the initial peak position to show the blueshift. The blueshift is observed only in the atmospheric experiment.
(Color online) One of the microscopic CCD images of PL of single NPs with excitation, taken with exposure. Scale bar indicates .
(Color online) Typical temporal evolution of PL of two single NPs observed for (a) 365 and (b) excitations (one individual single NP for each excitation wavelength). The PL emission wavelength was deduced from the intensity of R and G signals in CCD images of individual single NPs acquired with a integration per frame. Plot starts approximately after the commencement of excitation when the background emission from disappears.
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