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Bright and Effectual Perovskite Light-Emitting Electrochemical Cells Leveraging Ionic Additives AITranslate

Masoud Alahbakhshi; Aditya Mishra; Ross Haroldson; Arthur Ishteev; Jiyoung Moon; Qing Gu; Jason D. Slinker; Anvar A. Zakhidov;
The University of Texas at Dallas; The University of Texas at Dallas; The University of Texas at Dallas; ITMO University; The University of Texas at Dallas; The University of Texas at Dallas; The University of Texas at Dallas; ITMO University
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Publisher: ACS
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Abstract AITranslate

Perovskite light-emitting diodes (PeLEDs) have drawn considerable attention for their favorable optoelectronic properties. Perovskite light-emitting electrochemical cells (PeLECs)—devices that utilize mobile ions—have recently been reported but have yet to reach the performance of the best PeLEDs. We leveraged a poly(ethylene oxide) electrolyte and a lithium salt in CsPbBr3 thin films to produce PeLECs of improved brightness and efficiency. In particular, we found that a single-layer PeLEC from CsPbBr3:PEO:LiPF6 with 0.5 wt % LiPF6 produced bright (∼15000 cd/m2) electroluminescence of improved efficiency (3.0 Lm/W). To understand this improved performance among PeLECs, we characterized these perovskite thin films with photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). These studies revealed that this optimal LiPF6 concentration improves electrical double-layer formation, reduces the occurrence of voids, charge traps, and pinholes, and increases grain size and packing density.

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DOI：https://doi.org/10.1021/acsenergylett.9b01925

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Citation Information:

Perovskite light-emitting diodes (PeLEDs) have drawn considerable attention for their favorable optoelectronic properties. Perovskite light-emitting electrochemical cells (PeLECs)—devices that utilize mobile ions—have recently been reported but have yet to reach the performance of the best PeLEDs. We leveraged a poly(ethylene oxide) electrolyte and a lithium salt in CsPbBr3 thin films to produce PeLECs of improved brightness and efficiency. In particular, we found that a single-layer PeLEC from CsPbBr3:PEO:LiPF6 with 0.5 wt % LiPF6 produced bright (∼15000 cd/m2) electroluminescence of improved efficiency (3.0 Lm/W). To understand this improved performance among PeLECs, we characterized these perovskite thin films with photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). These studies revealed that this optimal LiPF6 concentration improves electrical double-layer formation, reduces the occurrence of voids, charge traps, and pinholes, and increases grain size and packing density.

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GB/T 7714-2015 [1] Masoud Alahbakhshi, Aditya Mishra, Ross Haroldson, et al. ACS Energy Letters, 2019(4). DOI:10.1021/acsenergylett.9b01925.
MLA [1] Masoud Alahbakhshi, et al., ACS Energy Letters, no. 4, 2019, https://doi.org/10.1021/acsenergylett.9b01925.
APA [1] Masoud Alahbakhshi, Aditya Mishra, Ross Haroldson, Arthur Ishteev, Jiyoung Moon, Qing Gu, Jason D. Slinker, & Anvar A. Zakhidov. (2019). ACS Energy Letters(4). https://doi.org/10.1021/acsenergylett.9b01925
IEEE [1] Masoud Alahbakhshi, Aditya Mishra, Ross Haroldson, Arthur Ishteev, Jiyoung Moon, Qing Gu, Jason D. Slinker, and Anvar A. Zakhidov, ACS Energy Letters, no. 4, 2019, doi: 10.1021/acsenergylett.9b01925.