Fig. 1: Colour-tuneable PeACEL device.
From: Multicolour stretchable perovskite electroluminescent devices for user-interactive displays

a, Comparison of performance merits of current display technologies, including LCDs, OLEDs, QLEDs, PeLEDs, ACEL and PeACEL devices. b, Working mechanism of the PeACEL device. c,d, EL spectra (c) and photographs (d) of full-colour PeACEL devices operating at 100 V, 20 kHz. Scale bar, 1 cm. CB and VB represent the conduction band and valence band, respectively.