Highly Efficient Green LightâEmitting Diodes from AllâInorganic
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Highly Efficient Green LightâEmitting Diodes from AllâInorganic
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COMMUNICATION Perovskite LEDs
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Highly Efficient Green Light-Emitting Diodes from All-Inorganic Perovskite Nanocrystals Enabled by a New Electron Transport Layer Baiquan Liu, Lin Wang, Haoshuang Gu,* Handong Sun,* and Hilmi Volkan Demir* and excellent charge-transport capabilities.[1–5] These exceptional properties have also made perovskites suitable for applying to light-emitting diodes (LEDs).[6] Since the first demonstration of hybrid organic– inorganic CH3NH3PbBr3 perovskite LED (PeLED) in 2014,[7] PeLEDs have rapidly attracted a great deal of attention from both academic and industrial researchers.[8–10] So far, the highest external quantum efficiency (EQE) for hybrid organic–inorganic PeLED can reach 11%.[11] However, hybrid organic– inorganic perovskite materials suffer from the stability issue, which is a hurdle for the widespread use. Alternatively, all-inorganic perovskites (e.g., CsPbX3, X = I, Br, and Cl or mixed halide) possess superior thermal stability than their hybrid counterparts.[12–14] Besides, all-inorganic perovskites can exhibit high photoluminescence quantum yield (PLQY, e.g., > 90% in solution) and narrow emissions (e.g., full width at halfmaximum (FWHM)
