期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200276
关键词
defect passivation; energy funneling; green light-emitting diodes; phase adjustment; quasi-2D perovskites
资金
- National High Technology Research and Development Program [2015AA050601]
- National Natural Science Foundation of China [12134010, 62074117, 12174290, 61904126]
- Natural Science Foundation of Hubei Province, China [2019AAA020, 2021CFB039]
Quasi-2D perovskite light-emitting diodes (PeLEDs) have unique quantum confinement effect and excellent thermal stability, but the heterogeneous energy distribution leads to severe non-radiative recombination. By coordinating with lead and halides, the ambipolar amino acid 5-aminovaleric acid (5AVA) reconstitutes energy domains and minimizes interfacial defects, resulting in improved performance of PeLEDs.
Quasi-two-dimensional (quasi-2D) perovskite light-emitting diodes (PeLEDs) are considered as one of the most potential candidates in electroluminescence territory owing to their unique quantum confinement effect and excellent thermal stability of the light. Nevertheless, heterogeneous energy domain distribution leads to severe non-radiative recombination in the process of energy transfer, which enormously hinders the performance and application of PeLEDs. Herein, an ambipolar amino acid, 5-aminovaleric acid (5AVA), is demonstrated to be able to coordinate lead and halides simultaneously with its carboxyl and amidogen groups. The coordinated ambipolar molecule not only reconstitutes energy domains of perovskites but also minimizes the interfacial defects of PeLEDs. Accordingly, the presence of 5AVA in perovskite precursors leads to dramatic suppression of the n = 1 and n = 2 phases and accelerates energy transfer from wide bandgap domains to narrow bandgap ones. As a result, maximum external quantum efficiency (EQE) of 19.3% (18.20% +/- 1.10%) is achieved in quasi-2D green PeLEDs with current efficiency of 61.7 cd A(-1).
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