Fig. 4: Optoelectronic characterizations of large-area perovskite films.
From: Large-area and efficient perovskite light-emitting diodes via low-temperature blade-coating
a, b PL images of the large-area perovskite films fabricated by doctor-blading (a) and spin-coating (b). The film area is 6 × 9 cm2. c–h PLQY (c, d), Taverage (e, f), and radiative and non-radiative recombination rate (g, h) mapping of large-area films fabricated by doctor-blading (c, e, g) and spin-coating (d, f, h). The excitation wavelength and intensity for PLQY (TRPL) are 430 nm (369 nm) and 8 mW/cm2 (6 mW/cm2), respectively. The characterizations are performed on small-area films (56 films in total). The three-dimensional figures are plotted by spatial interpolation.
