Fig. 5: MQW superlattices with tunable emission wavelength.
From: Scalable photonic sources using two-dimensional lead halide perovskite superlattices
a PL spectra for the as-prepared bromide (blue), and the mixed-iodide (green, yellow, and orange) CQWs. The photographs of solutions under UV excitation and the GIWAXS pattern for the green superlattice are shown in insets. b The experimentally characterized (dots) and theory-fitted (curves) s-pol and p-pol PL radiation patterns for the green sample (N = 8 and dQB = 25.6 Å). The inset shows the extracted IP dipole ratio as a function of emission wavelength for the four samples considered in a, all above 0.8.
