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DOI	10.1016/j.scib.2020.08.025
	Perovskite QLED with an external quantum efficiency of over 21% by modulating electronic transport
	Fang T.; Wang T.; Li X.; Dong Y.; Bai S.; Song J.
发表日期	2021
ISSN	20959273
起始页码	36
结束页码	43
卷号	66 期号:1
英文摘要	Perovskite quantum-dot-based light-emitting diodes (QLEDs) are highly promising for future solid-state lightings and high-definition displays due to their excellent color purity. However, their device performance is easily affected by charge accumulation induced luminescence quenching due to imbalanced charge injection in the devices. Here we report green perovskite QLEDs with simultaneously improved efficiency and operational lifetime through balancing the charge injection with the employment of a bilayered electron transport structure. The charge-balanced QLEDs exhibit a color-saturated green emission with a full-width at half-maximum (FWHM) of 18 nm and a peak at 520 nm, a low turn-on voltage of 2.0 V and a champion external quantum efficiency (EQE) of 21.63%, representing one of the most efficient perovskite QLEDs so far. In addition, the devices with modulated charge balance demonstrate a nearly 20-fold improvement in the operational lifetime compared to the control device. Our results demonstrate the great potential of further improving the device performance of perovskite QLEDs toward practical applications in lightings and displays via rational device engineering. © 2020 Science China Press
关键词	Charge balance Electron transport Light-emitting diodes Perovskite Quantum dots
英文关键词	Balancing; Display devices; Efficiency; Electron transport properties; Organic light emitting diodes (OLED); Perovskite; Quantum chemistry; Semiconductor quantum dots; Charge accumulation; Electronic transport; External quantum efficiency; High definition display; Low turn-on voltages; Luminescence quenching; Operational lifetime; Solid state lighting; Quantum efficiency
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207392
作者单位	School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics & Nanomaterials, Nanjing, 210094, China; Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden
推荐引用方式 GB/T 7714	Fang T.,Wang T.,Li X.,et al. Perovskite QLED with an external quantum efficiency of over 21% by modulating electronic transport[J],2021,66(1).
APA	Fang T.,Wang T.,Li X.,Dong Y.,Bai S.,&Song J..(2021).Perovskite QLED with an external quantum efficiency of over 21% by modulating electronic transport.Science Bulletin,66(1).
MLA	Fang T.,et al."Perovskite QLED with an external quantum efficiency of over 21% by modulating electronic transport".Science Bulletin 66.1(2021).