Fig. 6: Perovskite/Polymer Composites-based Flexible PeLEDs.

a Schematic illustration of the interaction between silica network with perovskite (i), bending cycles-dependent EQE degradation behavior (ii). Reproduced with permission from ref. ¹¹⁹. Copyright 2022, John Wiley and Sons. b Photos of a lit LED under a 4V bias before (top) and after (bottom) stretching to 40% strain (i) and CE–voltage characteristics of the stretchable PeLEDs before and after stretching to 20% and 40% strain (ii). Reproduced with permission from ref. ¹²⁰. Copyright 2017, John Wiley and Sons. c Molecular structure and calculated ESP profile of a monomer molecule of EC (i), formation energies of surface I vacancies in the perovskite without and with EC treatment (ii), schematic and digital photo of the flexible PeLEDs (iii), and luminance of the device with different bending cycles at a bending radius of 3 mm. Reproduced with permission from ref. ¹²¹. Copyright 2022, John Wiley and Sons. d Schematics of MDI-PU-incorporated flexible perovskite films (i), J–V–L characteristics (ii), and EQE and CE (iii) as a function of current density measured after repeated bending and twisting. Reproduced with permission from ref. ¹²². Copyright 2022, American Chemical Society.