a) Perovskite spectrum, EQE and energy conversion efficiency versus current density. Reproduced with permission.[
267
] Copyright 2016, Nature Publishing Group. b) Unit cell structure and EL spectrum of perovskite with different <n> values. Reproduced with permission. Reproduced with permission.[
268
] Copyright 2016, Nature Publishing Group. c) Time‐resolved PL spectra for BAI:MAPbI3 (20:100) and BABr:MAPbBr3 (20:100), PL/EL spectra and EQE of BAI:MAPbI3 and BABr:MAPbBr3 with different molar ratios. Reproduced with permission.[
269
] Copyright 2017, Nature Publishing Group. d) PeLED current density and EQE. Reproduced with permission.[
270
] Copyright 2020, Nature Publishing Group. e) Fs‐transient absorption spectrum of PEA2SnI4 and TEA2SnI4 films excited at 400 nm, and the EQE characteristics of PeLED devices. Reproduced with permission.[
139
] Copyright 2020, American Chemical Society.