Figure 7
From: Gain roll-off in cadmium selenide colloidal quantum wells under intense optical excitation
(a,b) Static X-ray diffraction pattern (black line) and transient X-ray diffraction patterns (ΔS) as a function of power at 40 ps pump-probe delay using 3.1 eV pump photon energy. Data are shown for (a) 7.4 nm × 23 nm 4.5 ML and (b) 7.6 nm × 41 nm 5.5 ML CdSe CQW samples. (c,d) Quantification of the magnitude of ΔS signal as a function of excitation density for the same samples. Total ΔS signal is disambiguated into signal arising from thermal disordering and shift of the diffraction angle.
