期刊
SMALL
卷 18, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202204638
关键词
defects passivation; energy transfer; quasi-2D perovskite light-emitting diodes (PeLEDs); symmetric molecules; van der Waals gaps
类别
资金
- NSFC [51625301, 91733302, 51861145301]
- Key Projects of Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province [2019B1515120073, 2019B090921002]
- Guangdong Science and Technology Research Foundation [2020A1414010036]
- High-End Foreign Experts Project [G20200019046]
- Research Fund of Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology [2020B1212030010]
- China Postdoctoral Science Foundation [2020M683191]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110384]
- Fundamental Research Funds for the Central Universities [21621008]
- NSFC Project [51625301, 91733302, 51861145301, 62104083]
In this study, a symmetric molecule additive was designed and developed to improve the performance of red PeLEDs. The additive was successfully incorporated into quasi-2D perovskites and showed improved energy transfer, resulting in significantly enhanced red PeLEDs performance.
Although tremendous progress has recently been made in quasi-2D perovskite light-emitting diodes (PeLEDs), the performance of red PeLEDs emitting at approximate to 650-660 nm, which have wide prospects for application in photodynamic therapy, is still limited by an inefficient energy transfer process between the quasi-2D perovskite layers. Herein, a symmetric molecule of 3,3 '-(9H-fluorene-9,9-diyl)dipropanamide (FDPA) is designed and developed with two functional acylamino groups and incorporated into the quasi-2D perovskites as the additive for achieving high-performance red PeLEDs. It is demonstrated that the agent can simultaneously diminish the van der Waals gaps between individual perovskite layers and passivate uncoordinated Pb2+ related defects at the surface and grain boundaries of the quasi-2D perovskites, which truly results in an efficient energy transfer in the quasi-2D perovskite films. Consequently, the red PeLEDs emitting at 653 nm with a peak external quantum efficiency of 18.5% and a maximum luminance of 2545 cd m(-2) are achieved, which is among the best performing red quasi-2D PeLEDs emitting at approximate to 650-660 nm. This work opens a way to further improve the electroluminescence performance of red PeLEDs.
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