期刊
ADVANCED OPTICAL MATERIALS
卷 11, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202202901
关键词
energy level regulation; phase rearrangement; perovskite light-emitting diodes; quasi-2D perovskites; spacer cations; sky-blue light emission
This study introduces a subtly functionalized compound, methoxylated phenethylammonium bromide (y-MeO-PEABr), to improve the performance of sky-blue quasi-2D perovskite materials. The compound induces an upward shift of the energy levels and reduces the holes injection barrier, achieving better charge balance. The introduction of large y-MeO-PEA(+) cations effectively suppresses the formation of undesirable phases and improves energy transfer. The sky-blue quasi-2D PeLED based on 2-MeO-PEABr achieves a maximum external quantum efficiency of 10.85% at 486 nm. This work suggests a potential guide for designing high-performance blue quasi-2D PeLEDs using novel organic spacer cations.
Quasi-2D perovskite materials have great potential for achieving high-performance blue perovskite light-emitting diodes (PeLEDs). Major challenges lie in the need to minimize the energy level mismatch between the blue-emitting and the charge-transport materials for better carrier injection, and to suppress low-dimensional phases in quasi-2D systems for improved radiation recombination. Here, this work introduces a subtly functionalized compound, methoxylated phenethylammonium bromide (y-MeO-PEABr), into the sky-blue quasi-2D perovskite. This approach induces an upward shift of the energy levels of the perovskite and reduces the holes injection barrier, thereby achieving a better charge balance. In addition, the introduction of large y-MeO-PEA(+) cations effectively suppresses the formation of undesirable phases in quasi-2D perovskites, leading to a more concentrated phase distribution and accelerated energy transfer. Specifically, the sky-blue quasi-2D PeLED based on 2-MeO-PEABr exhibits optimal device performance, obtaining a maximum external quantum efficiency of 10.85% at 486 nm. This work suggests that this method may provide a guide for designing novel organic spacer cations to obtain high-performance blue quasi-2D PeLEDs.
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