Multifunctional Charge Transporting Materials for Perovskite Light-Emitting Diodes

Ji Eun Jeong, Jong Hyun Park, Chung Hyeon Jang, Myoung Hoon Song, Han Young Woo

Research output: Contribution to journalReview articlepeer-review

43 Citations (Scopus)

Abstract

Despite their low exciton-binding energies, metal halide perovskites are extensively studied as light-emitting materials owing to narrow emission with high color purity, easy/wide color tunability, and high photoluminescence quantum yields. To improve the efficiency of perovskite light-emitting diodes (PeLEDs), much effort has been devoted to controlling the emitting layer morphologies to induce charge confinement and decrease the nonradiative recombination. The interfaces between the emitting layer and charge transporting layer (CTL) are vulnerable to various defects that deteriorate the efficiency and stability of the PeLEDs. Therefore, the establishment of multifunctional CTLs that can improve not only charge transport but also critical factors that influence device performance, such as defect passivation, morphology/phase control, ion migration suppression, and light outcoupling efficiency, are highly required. Herein, the fundamental limitations of perovskites as emitters (i.e., defects, morphological and phase instability, high refractive index with poor outcoupling) and the recent developments with regard to multifunctional CTLs to compensate such limitations are summarized, and their device applications are also reviewed. Finally, based on the importance of multifunctional CTLs, the outlook and research prospects of multifunctional CTLs for the further improvement of PeLEDs are discussed.

Original languageEnglish
Article number2002176
JournalAdvanced Materials
Volume32
Issue number51
DOIs
Publication statusPublished - 2020 Dec 22

Bibliographical note

Funding Information:
J.‐E.J. and J.H.P. contributed equally to this work. This work was supported by the Korea University Grant, the National Research Foundation (NRF) of Korea (Grants NRF‐2019R1A2C2085290, 2019R1A6A1A11044070, 2018R1A2B2006198), and LG Display under LGD‐Korea University Incubation Program. This work was also supported by a brand project (1.200030.01) of the Ulsan National Institute of Science and Technology (UNIST).

Funding Information:
J.-E.J. and J.H.P. contributed equally to this work. This work was supported by the Korea University Grant, the National Research Foundation (NRF) of Korea (Grants NRF-2019R1A2C2085290, 2019R1A6A1A11044070, 2018R1A2B2006198), and LG Display under LGD-Korea University Incubation Program. This work was also supported?by a brand project (1.200030.01) of the Ulsan National Institute of Science and Technology (UNIST).

Publisher Copyright:
© 2020 Wiley-VCH GmbH

Keywords

  • charge transporting layers
  • light-emitting diodes
  • multifunctional layers
  • perovskites

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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