Perovskite Light‐Emitting Diodes: Efficient Visible Quasi‐2D Perovskite Light‐Emitting Diodes (Adv. Mater. 34/2016)

Efficient quasi-2D perovskite light-emitting diodes (PeLEDs) are realized by partially substituting methyl ammonium (MA) cations with phenylethyl ammonium cations in MAPbBr3. The excitons move to the crystals, which have the smallest bandgap, and recombine. The quasi-2D PeLED designed by T.-W. Lee and co-workers, as described on page 7515, shows higher luminance and current efficiency (2935 cd m−2 and 4.90 cd A−1, respectively) compared with 3D MAPbBr3 PeLEDs.