2D PEA₂SnI₄ Inkjet-Printed Halide Perovskite LEDs on Rigid and Flexible Substrates

Lead-free PEA(2)SnI(4)-based perovskite LEDs are successfully inkjet-printed on rigid and flexible substrates. Red-emitting devices (lambda(max) = 633 nm) exhibit, under ambient conditions, a maximum external quantum efficiency (EQE(max)) of 1% with a related brightness of 30 cd/m(2) at 10 mA/cm(2).