Document Type

Journal Article

Department/Unit

Department of Physics

Title

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

Language

English

Abstract

Perovskite light-emitting diodes (PeLEDs) have received increasing attentions because of their unique saturated emission color and solution fabrication capability. In this work, we report our effort for attaining high performance cesium lead tribromide (CsPbBr3)-based PeLEDs through controlled growth of the inorganic polycrystalline perovskite emissive layer. The effect of a small molecular 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 suppressing the leakage current in the PeLEDs, realized through improved charge transport and controlled growth of the CsPbBr3-emissive layer. A maximum luminance of 9396 cd/m^2 was realized for PeLEDs prepared using an optimal PBD additive concentration in the perovskite precursor solution, which is >4 times high than that of the control PeLED fabricated using a pure CsPbBr3-precursor solution (2455 cd/m^2).

Publication Date

2019

Source Publication Title

Journal of Materials Chemistry C

Publisher

Royal Society of Chemistry

DOI

10.1039/C8TC05988H

Link to Publisher's Edition

http://dx.doi.org/10.1039/C8TC05988H

ISSN (print)

20507526

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