期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 44, 页码 50393-50400出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c15144
关键词
blue; perovskite; quaternary ammonium; interface engineering; light-emitting diodes
资金
- Natural Science Foundation of Guangdong Province of China
- Science and Technology Program of Shenzhen
- Innovation and Technology Fund
- Guangdong-Hong Kong-Macao Joint Laboratory
- [2020A1515010792]
- [2020B15120022]
- [SGDX20201103095607022]
- [SGDX20190918105001787]
- [JCYJ20210324095003011]
- [GHP/013/19SZ]
- [2019B121205001]
This study finds that using quaternary ammonium-based ionic liquids as an interfacial modification layer in perovskite light-emitting diodes (PeLEDs) can significantly improve the device efficiency and stability. The interaction between quaternary ammonium ions and perovskite films improves the morphology and suppresses ion migration.
Perovskite light-emitting diodes (PeLEDs) have become a hot research topic in recent years and can now achieve an external quantum efficiency (EQE) of over 22% for green and red devices. However, the efficiency of blue PeLEDs, which are essential for display applications, lags far behind their green and red counterparts. The interface of the PeLEDs has a critical influence on the carrier transport and exciton recombination dynamics, and interface engineering is considered to be an effective strategy to improve the device performance. Herein, quaternary ammonium -based ionic liquids serve as an interfacial modification layer to significantly improve the device efficiency and stability. The interaction of quaternary ammonium cations with Pb(Br/Cl)6 octahedra promotes nucleation sites, which significantly improves the morphology of perovskite films and reduces the formation of defects in films. In addition, ion migration is also effectively suppressed in the device. As a result, with tributylmethylammonium bromide (TMAB) used as the interface layer, the EQE of the device is successfully increased from 3.5 to 6.7%, and the operational stability with a half-lifetime (T50) is increased by over 12 times. Our work provides a new class of interface modification materials toward high-performance blue PeLEDs.
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