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

Autor: Hsieh CA; Department of Photonics, National Yang MingChiao Tung University, No. 1001 University Road, Hsinchu, 300, Taiwan., Tan GH; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Chuang YT; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Lin HC; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Lai PT; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Jan PE; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Chen BH; Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, 30013, Taiwan., Lu CH; Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, 30013, Taiwan., Yang SD; Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, 30013, Taiwan., Hsiao KY; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Lu MY; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan., Chen LY; Department of Photonics, National Yang MingChiao Tung University, No. 1001 University Road, Hsinchu, 300, Taiwan., Lin HW; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan.
Jazyk: angličtina
Zdroj: Advanced science (Weinheim, Baden-Wurttemberg, Germany) [Adv Sci (Weinh)] 2023 Apr; Vol. 10 (10), pp. e2206076. Date of Electronic Publication: 2023 Feb 07.
DOI: 10.1002/advs.202206076
Abstrakt: 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.
(© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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