Journal Article10.1002/adma.202302283
Perovskite Light-Emitting Diodes with an External Quantum Efficiency Exceeding 30.
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TL;DR: In this article , a super high-efficiency green perovskite light-emitting diodes (PeLEDs) were constructed by balancing the electron-hole recombination and enhancing the light outcoupling.
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Abstract: Perovskite light-emitting diodes (PeLEDs) are strong candidates for next-generation display and lighting technologies due to their high color purity and low-cost solution-processed fabrication. However, PeLEDs are not superior to commercial organic light-emitting diodes (OLEDs) in efficiency, as some key parameters affecting their efficiency, such as the charge carrier transport and light outcoupling efficiency, are usually overlooked and not well optimized. Here, we report ultrahigh-efficiency green PeLEDs with quantum efficiencies surpassing a milestone of 30% by regulating the charge carrier transport and near-field light distribution to reduce electron leakage and achieve a high light outcoupling efficiency of 41.82%. We apply Ni0.9 Mg0.1 Ox films with a high refractive index and increased hole carrier mobility as the hole injection layer to balance the charge carrier injection and insert the polyethylene glycol layer between the hole transport layer and the perovskite emissive layer to block the electron leakage and reduce the photon loss. Therefore, with the modified structure, the state-of-the-art green PeLEDs achieve a world-record external quantum efficiency of 30.84% (average = 29.05 ± 0.77%) at a luminance of 6514 cd/m2 . This work provides an interesting idea to construct super high-efficiency PeLEDs by balancing the electron-hole recombination and enhancing the light outcoupling. This article is protected by copyright. All rights reserved.
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References
Bright light-emitting diodes based on organometal halide perovskite
Zhi-Kuang Tan,Reza Saberi Moghaddam,May Ling Lai,Pablo Docampo,Ruben Higler,Felix Deschler,Michael Price,Aditya Sadhanala,Luis M. Pazos,Dan Credgington,Fabian C. Hanusch,Thomas Bein,Henry J. Snaith,Richard H. Friend +13 more
TL;DR: It is shown, using photoluminescence studies, that radiative bimolecular recombination is dominant at higher excitation densities, Hence, the quantum efficiencies of the perovskite light-emitting diodes increase at higher current densities.
Perovskite energy funnels for efficient light-emitting diodes
Mingjian Yuan,Li Na Quan,Li Na Quan,Riccardo Comin,Grant Walters,Randy P. Sabatini,Oleksandr Voznyy,Sjoerd Hoogland,Yongbiao Zhao,Eric M. Beauregard,Pongsakorn Kanjanaboos,Zheng-Hong Lu,Dong Ha Kim,Edward H. Sargent +13 more
TL;DR: A perovskite mixed material comprising a series of differently quantum-size-tuned grains that funnels photoexcitations to the lowest-bandgap light-emitter in the mixture functions as charge carrier concentrators, ensuring that radiative recombination successfully outcompetes trapping and hence non-radiatives recombination.
2.1K
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TL;DR: The formation of submicrometre-scale structure in perovskite light-emitting diodes can raise their external quantum efficiency beyond 20%, suggesting the possibility of both high efficiency and high brightness.
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TL;DR: Perovskite quantum wells yield highly efficient LEDs spanning the visible and near-infrared as discussed by the authors. But their performance is not as good as those of traditional LEDs, and their lifetime is shorter.
Highly Efficient Perovskite-Quantum-Dot Light-Emitting Diodes by Surface Engineering
Jun Pan,Li Na Quan,Li Na Quan,Yongbiao Zhao,Wei Peng,Banavoth Murali,Smritakshi P. Sarmah,Mingjian Yuan,Lutfan Sinatra,Noktan M. Alyami,Jiakai Liu,Emre Yassitepe,Zhenyu Yang,Oleksandr Voznyy,Riccardo Comin,Mohamed N. Hedhili,Omar F. Mohammed,Zheng-Hong Lu,Dong Ha Kim,Edward H. Sargent,Osman M. Bakr +20 more
TL;DR: A two-step ligand-exchange strategy is developed, in which the long-carbon- chain ligands on all-inorganic perovskite quantum dots (QDs) are replaced with halide-ion-pair ligands.
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