Highly Efficient Pure-Blue Perovskite Light-Emitting Diode Leveraging CsPbBrxCl3−x/Cs4PbBrxCl6−x Nanocomposite Emissive Layer with Shallow Valence Band

In Young Choi; Sung Doo Baek; Ashkan Vakilipour Takaloo; Seung Yong Lee; Amir Hajibabaei; Kwang S. Kim; Jae Min Myoung

doi:10.1002/adom.202102502

Highly Efficient Pure-Blue Perovskite Light-Emitting Diode Leveraging CsPbBr_xCl₃₋_x/Cs₄PbBr_xCl₆₋_x Nanocomposite Emissive Layer with Shallow Valence Band

In Young Choi, Sung Doo Baek, Ashkan Vakilipour Takaloo, Seung Yong Lee, Amir Hajibabaei, Kwang S. Kim, Jae Min Myoung

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Metal-halide perovskite light-emitting diodes (PeLEDs) have shown great advancement in green, red, and near-infrared regions with external quantum efficiencies (EQEs) exceeding 20%. However, blue PeLEDs, an essential part of displays and lightings, show limited progress compared to the other color counterparts. Herein, a highly efficient pure-blue PeLED is demonstrated by leveraging a novel CsPbBr_xCl_3-_x/Cs₄PbBr_xCl_6-_x nanocomposite perovskite film as an emissive layer. The Cs₄PbBr_xCl_6-_x phase, the derived phase of CsPbBr₃ perovskite with a mixed halide system, effectively passivates defects in CsPbBr_xCl_3-_x, leading to high luminescence efficiency due to the significant reduction of nonradiative recombination. Furthermore, experimental and computational results confirmed that the compositionally optimized nanocomposite layer possesses a shallower valence band maximum (≈5.5 eV) than the pristine perovskite layer (≈5.9 eV), which is very advantageous in hole injection for device operation. The combined effects of the CsPbBr_xCl_3-_x/Cs₄PbBr_xCl_6-_x nanocomposite render the fabricated blue PeLED to exhibit a pure-blue emission at 470 nm with a maximum EQE of 5.3%.

Original language	English
Article number	2102502
Journal	Advanced Optical Materials
Volume	10
Issue number	6
DOIs	https://doi.org/10.1002/adom.202102502
Publication status	Published - 2022 Mar 18

Bibliographical note

Funding Information:
I.Y.C., S.‐D.B., and A.V.T. contributed equally to this work. This work was supported by Samsung Research Funding & Incubation Center of Samsung Electronics under Project No. SRFC‐MA1901‐01. S.‐D.B. was supported by the Korea Initiative for fostering University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF), funded by the Korean government (MSIT) (No. NRF‐2020M3H1A1077207).

Publisher Copyright:
© 2022 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

Access to Document

10.1002/adom.202102502

Cite this

@article{957b72873f35418698d40dc40da7b408,

title = "Highly Efficient Pure-Blue Perovskite Light-Emitting Diode Leveraging CsPbBrxCl3−x/Cs4PbBrxCl6−x Nanocomposite Emissive Layer with Shallow Valence Band",

abstract = "Metal-halide perovskite light-emitting diodes (PeLEDs) have shown great advancement in green, red, and near-infrared regions with external quantum efficiencies (EQEs) exceeding 20%. However, blue PeLEDs, an essential part of displays and lightings, show limited progress compared to the other color counterparts. Herein, a highly efficient pure-blue PeLED is demonstrated by leveraging a novel CsPbBrxCl3-x/Cs4PbBrxCl6-x nanocomposite perovskite film as an emissive layer. The Cs4PbBrxCl6-x phase, the derived phase of CsPbBr3 perovskite with a mixed halide system, effectively passivates defects in CsPbBrxCl3-x, leading to high luminescence efficiency due to the significant reduction of nonradiative recombination. Furthermore, experimental and computational results confirmed that the compositionally optimized nanocomposite layer possesses a shallower valence band maximum (≈5.5 eV) than the pristine perovskite layer (≈5.9 eV), which is very advantageous in hole injection for device operation. The combined effects of the CsPbBrxCl3-x/Cs4PbBrxCl6-x nanocomposite render the fabricated blue PeLED to exhibit a pure-blue emission at 470 nm with a maximum EQE of 5.3%.",

author = "Choi, {In Young} and Baek, {Sung Doo} and Takaloo, {Ashkan Vakilipour} and Lee, {Seung Yong} and Amir Hajibabaei and Kim, {Kwang S.} and Myoung, {Jae Min}",

note = "Funding Information: I.Y.C., S.‐D.B., and A.V.T. contributed equally to this work. This work was supported by Samsung Research Funding & Incubation Center of Samsung Electronics under Project No. SRFC‐MA1901‐01. S.‐D.B. was supported by the Korea Initiative for fostering University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF), funded by the Korean government (MSIT) (No. NRF‐2020M3H1A1077207). Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH",

year = "2022",

month = mar,

day = "18",

doi = "10.1002/adom.202102502",

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T1 - Highly Efficient Pure-Blue Perovskite Light-Emitting Diode Leveraging CsPbBrxCl3−x/Cs4PbBrxCl6−x Nanocomposite Emissive Layer with Shallow Valence Band

AU - Choi, In Young

AU - Baek, Sung Doo

AU - Takaloo, Ashkan Vakilipour

AU - Lee, Seung Yong

AU - Hajibabaei, Amir

AU - Kim, Kwang S.

AU - Myoung, Jae Min

N1 - Funding Information: I.Y.C., S.‐D.B., and A.V.T. contributed equally to this work. This work was supported by Samsung Research Funding & Incubation Center of Samsung Electronics under Project No. SRFC‐MA1901‐01. S.‐D.B. was supported by the Korea Initiative for fostering University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF), funded by the Korean government (MSIT) (No. NRF‐2020M3H1A1077207). Publisher Copyright: © 2022 Wiley-VCH GmbH

PY - 2022/3/18

Y1 - 2022/3/18

N2 - Metal-halide perovskite light-emitting diodes (PeLEDs) have shown great advancement in green, red, and near-infrared regions with external quantum efficiencies (EQEs) exceeding 20%. However, blue PeLEDs, an essential part of displays and lightings, show limited progress compared to the other color counterparts. Herein, a highly efficient pure-blue PeLED is demonstrated by leveraging a novel CsPbBrxCl3-x/Cs4PbBrxCl6-x nanocomposite perovskite film as an emissive layer. The Cs4PbBrxCl6-x phase, the derived phase of CsPbBr3 perovskite with a mixed halide system, effectively passivates defects in CsPbBrxCl3-x, leading to high luminescence efficiency due to the significant reduction of nonradiative recombination. Furthermore, experimental and computational results confirmed that the compositionally optimized nanocomposite layer possesses a shallower valence band maximum (≈5.5 eV) than the pristine perovskite layer (≈5.9 eV), which is very advantageous in hole injection for device operation. The combined effects of the CsPbBrxCl3-x/Cs4PbBrxCl6-x nanocomposite render the fabricated blue PeLED to exhibit a pure-blue emission at 470 nm with a maximum EQE of 5.3%.

AB - Metal-halide perovskite light-emitting diodes (PeLEDs) have shown great advancement in green, red, and near-infrared regions with external quantum efficiencies (EQEs) exceeding 20%. However, blue PeLEDs, an essential part of displays and lightings, show limited progress compared to the other color counterparts. Herein, a highly efficient pure-blue PeLED is demonstrated by leveraging a novel CsPbBrxCl3-x/Cs4PbBrxCl6-x nanocomposite perovskite film as an emissive layer. The Cs4PbBrxCl6-x phase, the derived phase of CsPbBr3 perovskite with a mixed halide system, effectively passivates defects in CsPbBrxCl3-x, leading to high luminescence efficiency due to the significant reduction of nonradiative recombination. Furthermore, experimental and computational results confirmed that the compositionally optimized nanocomposite layer possesses a shallower valence band maximum (≈5.5 eV) than the pristine perovskite layer (≈5.9 eV), which is very advantageous in hole injection for device operation. The combined effects of the CsPbBrxCl3-x/Cs4PbBrxCl6-x nanocomposite render the fabricated blue PeLED to exhibit a pure-blue emission at 470 nm with a maximum EQE of 5.3%.

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