Vacuum-Deposited Inorganic Perovskite Light-Emitting Diodes with External Quantum Efficiency Exceeding 10% Via Composition and Crystallinity Manipulation of Emission Layer Under High Vacuum

Overview

Journal Adv Sci (Weinh)

Specialty Biomedical Engineering

Date 2023 Feb 7

PMID 36748267

Authors

Chung-An Hsieh

Guang-Hsun Tan

Yung-Tang Chuang

Hao-Cheng Lin

Po-Ting Lai

Pei-En Jan

Bo-Han Chen

Chih-Hsuan Lu

Shang-Da Yang

Kai-Yuan Hsiao

Ming-Yen Lu

Li-Yin Chen

Hao-Wu Lin

Affiliations

Soon will be listed here.

Abstract

Although vacuum-deposited metal halide perovskite light-emitting diodes (PeLEDs) have great promise for use in large-area high-color-gamut displays, the efficiency of vacuum-sublimed PeLEDs currently lags that of solution-processed counterparts. In this study, highly efficient vacuum-deposited PeLEDs are prepared through a process of optimizing the stoichiometric ratio of the sublimed precursors under high vacuum and incorporating ultrathin under- and upper-layers for the perovskite emission layer (EML). In contrast to the situation in most vacuum-deposited organic light-emitting devices, the properties of these perovskite EMLs are highly influenced by the presence and nature of the upper- and presublimed materials, thereby allowing us to enhance the performance of the resulting devices. By eliminating Pb° formation and passivating defects in the perovskite EMLs, the PeLEDs achieve an outstanding external quantum efficiency (EQE) of 10.9% when applying a very smooth and flat geometry; it reaches an extraordinarily high value of 21.1% when integrating a light out-coupling structure, breaking through the 10% EQE milestone of vacuum-deposited PeLEDs.

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Vacuum-Deposited Inorganic Perovskite Light-Emitting Diodes with External Quantum Efficiency Exceeding 10% via Composition and Crystallinity Manipulation of Emission Layer under High Vacuum.

Hsieh C, Tan G, Chuang Y, Lin H, Lai P, Jan P Adv Sci (Weinh). 2023; 10(10):e2206076.

PMID: 36748267 PMC: 10074115. DOI: 10.1002/advs.202206076.

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