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In article number 2006736, Yan‐Qing Li, Jian‐Xin Tang, and co‐workers demonstrate a facile and reliable crystallization strategy for interfacial potassium‐guided perovskite grain growth, leading to efficient deep‐blue light‐emitting diodes with an external quantum efficiency of 4.14% and stable color coordinates of (0.125, 0.076).
Perovskite light‐emitting diodes (PeLEDs) are emerging candidates for the applications of solution‐processed full‐color displays. However, the device performance of deep‐blue PeLED still lags far behind that of their red and green counterparts, which is largely limited by low external quantum efficiency (EQE) and poor operational stability. Here, a facile and reliable crystallization strategy for...
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