Efficient and large-area all vacuum-deposited perovskite light-emitting diodes via spatial confinement

Peipei Du, Jinghui Li, Liang Wang, Liang Sun, Xi Wang, Xiang Xu, Longbo Yang, Jincong Pang, Wenxi Liang, Jiajun Luo (), Ying Ma and Jiang Tang ()
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Peipei Du: Huazhong University of Science and Technology (HUST)
Jinghui Li: Huazhong University of Science and Technology (HUST)
Liang Wang: Huazhong University of Science and Technology (HUST)
Liang Sun: Huazhong University of Science and Technology (HUST)
Xi Wang: Huazhong University of Science and Technology (HUST)
Xiang Xu: Huazhong University of Science and Technology (HUST)
Longbo Yang: Huazhong University of Science and Technology (HUST)
Jincong Pang: Huazhong University of Science and Technology (HUST)
Wenxi Liang: Huazhong University of Science and Technology (HUST)
Jiajun Luo: Huazhong University of Science and Technology (HUST)
Ying Ma: Huazhong University of Science and Technology (HUST)
Jiang Tang: Huazhong University of Science and Technology (HUST)

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract With rapid advances of perovskite light-emitting diodes (PeLEDs), the large-scale fabrication of patterned PeLEDs towards display panels is of increasing importance. However, most state-of-the-art PeLEDs are fabricated by solution-processed techniques, which are difficult to simultaneously achieve high-resolution pixels and large-scale production. To this end, we construct efficient CsPbBr3 PeLEDs employing a vacuum deposition technique, which has been demonstrated as the most successful route for commercial organic LED displays. By carefully controlling the strength of the spatial confinement in CsPbBr3 film, its radiative recombination is greatly enhanced while the nonradiative recombination is suppressed. As a result, the external quantum efficiency (EQE) of thermally evaporated PeLED reaches 8.0%, a record for vacuum processed PeLEDs. Benefitting from the excellent uniformity and scalability of the thermal evaporation, we demonstrate PeLED with a functional area up to 40.2 cm2 and a peak EQE of 7.1%, representing one of the most efficient large-area PeLEDs. We further achieve high-resolution patterned perovskite film with 100 μm pixels using fine metal masks, laying the foundation for potential display applications. We believe the strategy of confinement strength regulation in thermally evaporated perovskites provides an effective way to process high-efficiency and large-area PeLEDs towards commercial display panels.

Date: 2021
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DOI: 10.1038/s41467-021-25093-6

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