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Quasi‐2D (Q‐2D) perovskites are promising materials applied in light‐emitting diodes (LEDs) due to their high exciton binding energy and quantum confinement effects. However, Q‐2D perovskites feature a multiphase structure with abundant grain boundaries and interfaces, leading to nonradiative loss during the energy‐transfer process. Here, a more efficient energy transfer in Q‐2D perovskites is achieved...
The poor stability of perovskite light‐emitting diodes (PeLEDs) is a key bottleneck that hinders commercialization of this technology. Here, the degradation process of formamidinium lead iodide (FAPbI3)‐based PeLEDs is carefully investigated and the device stability is improved through binary‐alkalication incorporation. Using time‐of‐flight secondary‐ion mass spectrometry, it is found that the degradation...
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