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

Bo Zhao*, Ying Suet Lau, Ali Asgher Syed, Fangming Jin, Fu Rong ZHU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)5293-5298
Number of pages6
JournalJournal of Materials Chemistry C
Volume7
Issue number18
DOIs
Publication statusPublished - 2019

Scopus Subject Areas

  • Chemistry(all)
  • Materials Chemistry

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