用于高效有机发光二极管发射管理的纳米颗粒阵列
Nanoparticle Arrays for Efficient Organic Light-Emitting Diode Emission Management
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中文总结 AI 辅助
研究针对OLED因效率问题限制应用的情况，基于等离子体纳米颗粒阵列的集体表面晶格共振，通过设计阵列几何结构和OLED结构，实现电致发光光谱和角度增强，为定制OLED发射提供嵌入式解决方案。
中文摘要 AI 辅助
有机发光二极管（OLED）因出色的色彩质量、机械柔韧性和自发光特性，在照明和显示领域应用日益广泛。但其外部量子效率低和高驱动电压下效率滚降限制了其使用。本文基于嵌入四种不同最先进OLED结构有源层的等离子体纳米颗粒阵列的集体表面晶格共振，展示了增强的外耦合以及OLED发射的方向和偏振控制。方形阵列和产生平带的更复杂晶格都能将光引导到由其光学模式决定的方向和偏振。通过设计阵列几何结构和OLED结构，可实现高达30%的电致发光光谱和角度增强。结果验证了纳米颗粒阵列的表面晶格共振为定制OLED发射提供了强大且通用的嵌入式解决方案，与窄光谱发射器结合还有提高效率的前景。
英文摘要
OLEDs are increasingly applied in illumination and displays because they offer excellent color quality, are mechanically flexible, and are self-emissive. However, their usage is limited by low external quantum efficiency (EQE) and efficiency roll-off at high driving voltages. These limitations, together with demands for smaller pixels and device sizes in emerging technologies, motivate innovations that increase efficiency and allow replacing external optical elements with embedded solutions. Here, we demonstrate enhanced outcoupling as well as directional and polarization control of OLED emission, based on collective surface lattice resonances of plasmonic nanoparticle arrays that are embedded in the active layers of four different state-of-the-art OLED structures. Both square arrays and more complex lattices producing flat bands are demonstrated to guide the light to directions and polarizations determined by their optical modes. We show that by the design of the array geometry and the OLED structure, spectral and angular enhancement of the electroluminescence (EL), up to 30 %, can be achieved. Our results verify that surface lattice resonances of nanoparticle arrays offer a robust and versatile embedded solution for tailoring the OLED emission, as well as exciting prospects for efficiency increase if combined with narrow-spectrum emitters.
