Additive-Stabilized Emission Centers for Blue Perovskite Light-Emitting Diodes

摘要

The performance of the blue perovskite light-emittingdiodes (PeLEDs)is limited by the low photoluminescence quantum yields (PLQYs) andthe unstable emission centers. In this work, we incorporate sodiumbromide and acesulfame potassium into a quasi-2D perovskite to controlthe dimension distribution and promote the PLQYs. Benefiting fromthe efficient energy cascade channel and passivation, the sky-bluePeLED has an external quantum efficiency of 9.7% and no shift of theelectroluminescence center under operation voltages from 4 to 8 V.Moreover, the half lifetime of the devices reaches 325 s, 3.3 timesthat of control devices without additives. This work provides newinsights into enhancing the performance of blue PeLEDs.

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