氯化物对蓝光混合卤化物钙钛矿不稳定性的影响。

IF 4.1 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Frontiers of Optoelectronics Pub Date : 2023-11-17 DOI:10.1007/s12200-023-00088-x
Max Karlsson, Jiajun Qin, Kaifeng Niu, Xiyu Luo, Johanna Rosen, Jonas Björk, Lian Duan, Weidong Xu, Feng Gao
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引用次数: 0

摘要

尽管在过去的十年中,钙钛矿发光二极管(PeLEDs)在器件效率方面取得了前所未有的发展,但它们的运行稳定性却很差。对于蓝色发光二极管来说尤其如此,其使用寿命比绿色和红色发光二极管要长几个数量级。在这里,我们系统地研究了一系列基于混合Br/ cl -钙钛矿的绿色和蓝色发光pled的效率-稳定性差异。我们发现氯化物的掺入虽然对效率的影响有限,但即使是少量的,也会对器件的稳定性产生不利影响。随着cl含量的增加,器件寿命呈指数下降,同时在操作过程中,电气性能的变化率也在增加。我们将这种现象归因于混合卤化物晶格中卤素离子的迁移率增加,这是由于化学和结构上无序的景观增加,迁移障碍减少。我们的研究结果表明,提高ped的稳定性可能需要不同于提高效率的策略。
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Role of chloride on the instability of blue emitting mixed-halide perovskites.

Although perovskite light-emitting diodes (PeLEDs) have seen unprecedented development in device efficiency over the past decade, they suffer significantly from poor operational stability. This is especially true for blue PeLEDs, whose operational lifetime remains orders of magnitude behind their green and red counterparts. Here, we systematically investigate this efficiency-stability discrepancy in a series of green- to blue-emitting PeLEDs based on mixed Br/Cl-perovskites. We find that chloride incorporation, while having only a limited impact on efficiency, detrimentally affects device stability even in small amounts. Device lifetime drops exponentially with increasing Cl-content, accompanied by an increased rate of change in electrical properties during operation. We ascribe this phenomenon to an increased mobility of halogen ions in the mixed-halide lattice due to an increased chemically and structurally disordered landscape with reduced migration barriers. Our results indicate that the stability enhancement for PeLEDs might require different strategies from those used for improving efficiency.

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来源期刊
Frontiers of Optoelectronics
Frontiers of Optoelectronics ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
7.80
自引率
0.00%
发文量
583
期刊介绍: Frontiers of Optoelectronics seeks to provide a multidisciplinary forum for a broad mix of peer-reviewed academic papers in order to promote rapid communication and exchange between researchers in China and abroad. It introduces and reflects significant achievements being made in the field of photonics or optoelectronics. The topics include, but are not limited to, semiconductor optoelectronics, nano-photonics, information photonics, energy photonics, ultrafast photonics, biomedical photonics, nonlinear photonics, fiber optics, laser and terahertz technology and intelligent photonics. The journal publishes reviews, research articles, letters, comments, special issues and so on. Frontiers of Optoelectronics especially encourages papers from new emerging and multidisciplinary areas, papers reflecting the international trends of research and development, and on special topics reporting progress made in the field of optoelectronics. All published papers will reflect the original thoughts of researchers and practitioners on basic theories, design and new technology in optoelectronics. Frontiers of Optoelectronics is strictly peer-reviewed and only accepts original submissions in English. It is a fully OA journal and the APCs are covered by Higher Education Press and Huazhong University of Science and Technology. ● Presents the latest developments in optoelectronics and optics ● Emphasizes the latest developments of new optoelectronic materials, devices, systems and applications ● Covers industrial photonics, information photonics, biomedical photonics, energy photonics, laser and terahertz technology, and more
期刊最新文献
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