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UV-visible absorption spectra and normalized one-photon induced PL spectra of QD548 (2.2 nm) (black) and QD606 (2.8 nm) (red). The inset shows the corresponding TEM images of QD548 and QD606.
(a) Open-aperture Z-scan curves of QD548 (▪) and QD606 (●) at the optical wavelength of 527 nm and the input intensity of 5.5 GW/cm2. The solid lines in (a) are the fits according to Z-scan theory. (b) Normalized transmittance change versus the input intensity tuning from 3.3 to 37.5 GW/cm2 of QD548 (▪) and QD606 (●). (c) A plot of natural logarithm of the transmittance at the focus plane in intensity-dependent Z-scan as a function of input intensity of QD548 (▪) and QD606 (●).
(a) Normalized two-photon excited PL of QD548 (black) and QD606 (red) excited at 800 nm. The corresponding two-photon excited PL images are shown in the inset. (b) Schematic diagram for the whole process of the one- and two-photon excited PL for QDs. (c) Log-log plots of the PL intensities as a function of excitation power at 800 nm. The red lines are the linear fittings. The slopes for QD606 and QD548 are 2.03 and 1.93, respectively. (d) Open aperture Z-scan curves of QD548 (▪), QD606 (●), and toluene (◆) at the wavelength of 800 nm and the input intensity of 45 GW/cm2. The solid lines are the fitting curves using Z-scan theory.
CA/OA curves of Z-scan of QD548 (▪), QD606 (●), and toluene (◆) at the wavelength of 800 nm and the input intensity of 100 GW/cm2. The dotted lines are the fitting curves using Z-scan theory.
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