Fig. 1: Linear absorption and PL in PNC samples. | Light: Science & Applications

Fig. 1: Linear absorption and PL in PNC samples.

From: Origins of the long-range exciton diffusion in perovskite nanocrystal films: photon recycling vs exciton hopping

Fig. 1

(a) Illustration of our PNC samples. (b) Absorption and PL spectra of colloidal MAPbBr3 PNCs with different ligands in toluene solution. (c) Illustration of the exciton diffusion imaging. (d) Image of the TEM00 pump excitation spot produced by a 473 nm CW laser, with σ = 900 ± 30 nm (FWHM = 2.1 ± 0.1 μm). The pump profile was fitted with a 2D Gaussian function. (e–g) PL images of the PNC films with different ligands, whose profiles were fitted with Eq. (2). The x- and y- cross-sections of the PL (blue) and pump (red) are shown for comparison. The dotted line in (b) corresponds to the maximum PL wavelength. The dotted and solid lines in the (d–g) contour color plots correspond to circles with radii of 2σ and 2σ + LD, respectively

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