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Efficient solution-processed green and white phosphorescence organic light-emitting diodes based on bipolar host materials

机译:基于双极主体材料的高效固溶处理的绿色和白色磷光有机发光二极管

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摘要

Four carbazole-based bipolar host materials are utilized for solution-processed phosphorescent organic light-emitting diodes (PhOLEDs). These bipolar materials consist of an electron-donor unit (carbazole) linking to a fluorene unit bearing various electron-acceptor units (oxadiazole, cyano, and benzimidazole) via a saturated carbon, giving sufficiently high triplet energies due to the lack of direct electronic coupling between the donor and acceptor(s). The resulting physical properties and bipolar characteristics render the realization of efficient solution-processed green and white OLEDs feasible. The best green light-emitting device based on bipolar host CzFCBI incorporating a stepwise hole-injection/ transporting system exhibit a low drive voltage, a maximum external quantum efficiency of 14.0%, a current efficiency of 49.0 cd/A, and a power efficacy of 55.0 lm/W. Moreover, the CzFOXa-based two-component (blue-orange) white light-emitting device shows a warmish-white emission with a maximum external quantum efficiency of 6.9% and stable chro-maticity coordinates at different luminance levels and yield a high color rendering index (CRI) reaching 76 at a luminance of 1000 cd/m~2.
机译:四种基于咔唑的双极主体材料被用于溶液处理的磷光有机发光二极管(PhOLED)。这些双极材料由一个电子供体单元(咔唑)连接到一个芴单元,该芴单元通过饱和碳与带有各种电子受体单元(恶二唑,氰基和苯并咪唑)的芴单元相连,由于缺乏直接电子耦合,产生足够高的三重态能量在捐赠者和接受者之间。所得的物理性质和双极性特性使得实现有效的溶液处理的绿色和白色OLED可行。最好的基于双极主体CzFCBI并结合了逐步空穴注入/传输系统的绿色发光器件具有低驱动电压,最大外部量子效率14.0%,电流效率49.0 cd / A和功率功效55.0 lm / W。此外,基于CzFOXa的两组分(蓝橙色)白色发光器件显示出暖白色发射,其最大外部量子效率为6.9%,并且在不同的亮度水平下具有稳定的色度坐标,并产生高显色性指数(CRI)在1000 cd / m〜2的亮度下达到76。

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