Journal
ADVANCED OPTICAL MATERIALS
Volume 11, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202201778
Keywords
ion migration; light-emitting diodes; operational stability; perovskites
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This study demonstrates the feasibility of significant stability improvement for PeLEDs using a simple cation engineering strategy, in which long-chain phenylbutanammonium is used to effectively suppress ion migration inside the PeLEDs.
Although organic metal halide perovskite light-emitting diodes (PeLEDs) have been developed rapidly in recent years, their commercialization and further applications are still hindered by ion migration-induced inferior operational stability. Although the formation of a quasi-2D structure is a well-known solution that can efficiently suppress ion migration, the operation lifetime improvement is still limited. In this study, long-chain phenylbutanammonium is used to replace the commonly used phenethylammonium as the L-site cations. With large steric hindrance, ion migration inside the PeLEDs is effectively suppressed. Consequently, the PeLED with near-infrared emission at 763 nm exhibited an operational lifetime (T-90) of up to 5.3 h, which is 53-fold higher than that of the control device. This study demonstrates the feasibility of significant stability improvement using a simple cation engineering strategy for PeLEDs.
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