Two-Factor Phase Separations in Mixed-Halide Quasi-2D Perovskite LEDs: Dimensionality and Halide Segregations

Yang, Seok Joo; Wang, Kang; Luo, Yanqi; Park, Jee Yung; Yang, Hanjun; Coffey, Aidan H.; Ma, Ke; Sun, Jiaonan; Wieghold, Sarah; Zhu, Chenhui; Dou, Letian

doi:10.1021/acsenergylett.3c01009

Two-Factor Phase Separations in Mixed-Halide Quasi-2D Perovskite LEDs: Dimensionality and Halide Segregations

Journal Article · Tue Aug 08 00:00:00 EDT 2023 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.3c01009· OSTI ID:2404933

^[1]; ^[1]; Luo, Yanqi ^[2]; Park, Jee Yung ^[1]; ^[1]; Coffey, Aidan H. ^[3]; Ma, Ke ^[1]; ^[1]; Wieghold, Sarah ^[2]; Zhu, Chenhui ^[3]; ^[1]

Purdue Univ., West Lafayette, IN (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Quasi-2D halide perovskites have attracted much interest as a promising material for light-emitting diodes (LEDs) due to their tunability in quantum confinement and halide alloy formation to modulate the energy bandgap and emission color. However, two-factor phase separations with respect to heterogeneous quantum-well thicknesses and halide segregation are still crucial issues in quasi-2D perovskite LEDs, leading to low external quantum efficiencies (EQEs) and color shifts. In this work, we compare quasi-2D perovskite films using different cations to unveil the key contributions from the chemical design of organic cations. While mixing halide ions in conventional quasi-2D perovskite films induces micrometer-scale heterogeneity, new extended and twisted conjugated cations suppress the two-factor phase separations, leading to high EQEs of over 25% and controllable emission wavelengths across red and near-infrared regions. The fundamental insights in this work will provide guidance for advancing materials design and device performance in the future.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2404933

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 9 Vol. 8; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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