Fig. 5
From: Color-stable highly luminescent sky-blue perovskite light-emitting diodes
EL spectra of PeLEDs. a EL spectra of PeLEDs operating under different voltage. b EL spectra of PeLED operating with various exposure times. c Lifetime measurement of the PeLEDs device at different initial luminance. The inset is estimated half-lifetime using the stretched exponential decay. d EL spectra and e CIE 1931 chromatic coordinates of the PeLEDs with PEDOT:PSS, PVK or NiOx as HTL. f Digital photographs of the operating PeLEDs with PEDOT:PSS (i), PVK (ii), and NiOx (iii) as the HTL materials, respectively
