Fig. 2: Angular-dependent emission profiles of the PeLEDs.
From: Microcavity top-emission perovskite light-emitting diodes
a EL spectra of the TE-PeLED at 0, 30, and 60°. The EL is blueshifted with increasing viewing angle. b Angular-dependent profiles of the emission of the TE-PeLED at different wavelengths, which clearly show that most of the EL is small-angle light. c EL spectra of the BE-PeLED at 0, 30, and 60°. The EL spectra remain unchanged in different directions. d Angular-dependent profiles of the emission of the BE-PeLED at different wavelengths, which follow a Lambertian profile.
