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Highly efficient pure red light-emitting diodes through surface bromination of CsPbI3 perovskite nanocrystals for skin-attachable displays

Title
Highly efficient pure red light-emitting diodes through surface bromination of CsPbI3 perovskite nanocrystals for skin-attachable displays
Author(s)
Lee, KyunghoonKim, YunhoAhn, EonhyoungKwon, Jong IkMa, HyeonjongJang, Jae HongLi, ShiLee, Hyo CheolLee, Gwang HeonLee, SoyeonKim, KiwookSung, Nak JunKim, DongeunSong, Myoung HoonChoi, Moon KeeYang, Jiwoong
Issued Date
2024-06
Citation
Materials Today, v.75, pp.2 - 10
Type
Article
Author Keywords
PerovskitesCsPbI3Surface engineeringPure red emissionsLight-emitting diodes
Keywords
EMISSIONBRCLPHOTOINDUCED HALIDE SEGREGATIONQUANTUM DOTSCESIUMPASSIVATIONTEMPERATURE
ISSN
1369-7021
Abstract
Metal halide perovskites, known for their outstanding optical properties such as high photoluminescence quantum yield, exceptional color purity, and tunable bandgap, have emerged as promising semiconductor materials for next-generation display technologies. Nonetheless, producing pure red emissions from ∼ 10 nm-sized CsPbI3 perovskite nanocrystals (PeNCs) remains a significant challenge for perovskite light-emitting didoes (PeLEDs). Here, we present the facile surface bromination strategy of CsPbI3 PeNCs for pure red PeLEDs. The mild post-ligand treatment on CsPbI3 PeNCs produces surface-brominated PeNCs, denoted as CsPbI3:Br, while preserving the original CsPbI3 crystal structure intact. The resulting CsPbI3:Br PeNCs exhibit bright pure red luminescence and significant improvements in electrical properties. The PeLEDs, fabricated with these PeNCs, achieve a remarkable external quantum efficiency (EQE) of 19.8 %, comparable to those of the best reported pure red PeLEDs. Finally, we have showcased the application of these PeLEDs as skin-attachable PeLEDs, showing stable operations under various mechanical deformations. This study not only provides a straightforward method for producing pure red PeNCs, but also highlights their potential in wearable electronic applications. © 2024 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/56591
DOI
10.1016/j.mattod.2024.03.008
Publisher
Elsevier
Related Researcher
  • 양지웅 Yang, Jiwoong
  • Research Interests Quantum Dots; Nanocrystals; Displays; Solar Energy; TEM; Photocatalyst
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Appears in Collections:
Department of Energy Science and Engineering NanoMaterials Laboratory 1. Journal Articles

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