arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.15455cond-mat.mtrl-sciphysics.app-ph
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亮度和颜色可调的单层过氧化物主体-离子客体发光电化学电池

Bright and Color-Tunable Single Layer Perovskite Host-Ionic Guest Light Emitting Electrochemical Cells

Aditya Mishra, Stephen DiLuzio, Masoud Alahbakhshi, Austen Adams, Melanie H. Bowler, Qing Gu, Anvar A. Zakhidov, Stefan Bernhard, Jason D. Slinker

摘要:

半导体发光器件由于其良好的光电性能而受到人们的广泛关注。高载流子迁移率使钙钛矿成为电致发光器件中的主体材料的优异候选者。为了在简单的单层器件中实现高性能,我们采用了CsPbBr 3钙钛矿主体和新型离子铱络合物客体以及掺杂剂来展示高效的发光电化学电池(PeLEC)。对于最佳的客体/主体共混物,在11.6 cd/A和9.04 Lm/W下的10600 cd/m2亮度在4.1 V下实现。这些器件显示出由可重构离子材料共混物促进的从橙红色到绿色的电压依赖性电致发光颜色。优化后的器件在恒流驱动下工作稳定,40 h内发光强度大于630 cd/m2。我们合理设计的离子客体在主体的最佳浓度下产生了有效的(>90%)福斯特能量转移和改善的薄膜形态,用于通过离子迁移到界面实现的高性能PeLEC操作

英文摘要:

Perovskite light emitting devices have drawn considerable attention for their favorable optoelectronic properties. High carrier mobilities make perovskites excellent candidates as host materials in electroluminescent devices. To achieve high performance in a simple single layer device, we employed a CsPbBr3 perovskite host and a novel ionic iridium complex guest along with a polyelectrolyte to demonstrate efficient light emitting electrochemical cells (PeLECs). For an optimal guest/host blend, 10600 cd/m2 luminance at 11.6 cd/A and 9.04 Lm/W are achieved at 4.1 V. These devices showed voltage-dependent electroluminescence color proceeding from orange-red to green, facilitated by the reconfigurable ionic materials blend. Optimized devices exhibited stable operation under constant current driving, maintaining >630 cd/m2 emission for 40 h. Our rationally-designed ionic guest at an optimal concentration of the host produced efficient (>90%) Forster energy transfer and improved thin film morphological for high performance PeLEC operation enabled by ionic migration to interfaces

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