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Efficient quasi‐2D‐structure perovskite light‐emitting diodes (4.90 cd A−1) are demonstrated by mixing a 3D‐structured perovskite material (methyl ammonium lead bromide) and a 2D‐structured perovskite material (phenylethyl ammonium lead bromide), which can be ascribed to better film uniformity, enhanced exciton confinement, and reduced trap density.
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...
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