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Effect of small molecule additives on efficient operation of all inorganic polycrystalline perovskite light-emitting diodes

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Abstract

Perovskite light-emitting diodes (PeLEDs) have received increasing attention because of their unique saturated emission color and solution fabrication capability. In this work, we report our effort towards obtaining high performance cesium lead tribromide (CsPbBr3)-based PeLEDs through controlled growth of the inorganic polycrystalline perovskite emissive layer. The effect of a small molecule additive 2-((4-biphenylyl)-5-phenyl-1,3,4-oxadiazole) (PBD) on the formation of the uniform pinhole free one-step-processed CsPbBr3-based emissive layer was analyzed. The results reveal that the use of the PBD additive in the precursor solution enables the suppression of the leakage current in the PeLEDs, which is realized through improved charge transport and controlled growth of the CsPbBr3-emissive layer. A maximum luminance of 9396 cd m−2 was realized for the PeLEDs, prepared using an optimal PBD additive concentration in the perovskite precursor solution, which is >4 times that of the control PeLEDs fabricated using a pure CsPbBr3-precursor solution (2455 cd m−2).

Graphical abstract: Effect of small molecule additives on efficient operation of all inorganic polycrystalline perovskite light-emitting diodes

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Publication details

The article was received on 28 Nov 2018, accepted on 05 Feb 2019 and first published on 05 Feb 2019


Article type: Paper
DOI: 10.1039/C8TC05988H
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Effect of small molecule additives on efficient operation of all inorganic polycrystalline perovskite light-emitting diodes

    B. Zhao, Y. S. Lau, A. A. Syed, F. Jin and F. Zhu, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC05988H

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