TY - JOUR
T1 - Multifunctional Charge Transporting Materials for Perovskite Light-Emitting Diodes
AU - Jeong, Ji Eun
AU - Park, Jong Hyun
AU - Jang, Chung Hyeon
AU - Song, Myoung Hoon
AU - Woo, Han Young
N1 - 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
PY - 2020/12/22
Y1 - 2020/12/22
N2 - 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.
AB - 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.
KW - charge transporting layers
KW - light-emitting diodes
KW - multifunctional layers
KW - perovskites
UR - http://www.scopus.com/inward/record.url?scp=85090134907&partnerID=8YFLogxK
U2 - 10.1002/adma.202002176
DO - 10.1002/adma.202002176
M3 - Review article
C2 - 32886378
AN - SCOPUS:85090134907
SN - 0935-9648
VL - 32
JO - Advanced Materials
JF - Advanced Materials
IS - 51
M1 - 2002176
ER -