High‐performance pure-red light‐emitting diodes based on CsPbBrxI3-x–multi-ligands–KBr composite films

Do Hoon Kim, Hee Ju An, In Young Choi, Jae Min Myoung

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Metal halide perovskites have been extensively investigated for application in light-emitting diodes (LEDs) because their optical band gap can be adjusted via the alteration of their halide-ion composition. However, the performance of metal halide perovskite LEDs (PeLEDs) is limited by halide-vacancy-induced surface defects. Therefore, mixed-halide perovskites were introduced to prevent the formation of halide vacancies on the perovskite surface. However, typical CsPbBrxI3‑x-based PeLEDs exhibit ion migration under an electrical field, which results in phase segregation and the deterioration of the device performance. In this study, to overcome these obstacles, PeLEDs based on CsPbBrxI3-x–multi-ligands–KBr films were introduced. The use of multi-ligands could facilitate the recombination of excitons and stabilization of the α-phase perovskite crystals. Moreover, the KBr not only prevented the formation of halide vacancies by interaction with excess halide ions but also improved the surface coverage. Thus, an optimized film-based—CsPbBrxI3-x–multi-ligand (70% NMABr0.7I0.3–15% N,N-dimethyl-1,3-propanediammonium bromide–15% 1,3-propanediammonium bromide)–KBr (0.03 M)—PeLED was fabricated, which had a current density of 5.1 mA/cm2, current efficiency of 3.2 cd/A, luminance of 743.2 cd/m2, and an external quantum efficiency of 10.2%. Moreover, this PeLED exhibited a low turn-on voltage (1.6 V) with pure-red emission.

Original languageEnglish
Article number132375
JournalChemical Engineering Journal
Publication statusPublished - 2022 Feb 1

Bibliographical note

Funding Information:
This work was supported by Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-MA1901-01 .

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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