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Hexagonally connected submicron hollow veins for high efficiency, narrow beam organic emitters
Photonics and Nanostructures - Fundamentals and Applications ( IF 2.5 ) Pub Date : 2021-02-11 , DOI: 10.1016/j.photonics.2021.100902
Young-Bin Kim , Jin-Woo Cho , Yoon-Jong Moon , Dukkyu Bae , Sun-Kyung Kim

This study presents a hexagonal array of submicron hollow veins covered with a high-refractive-index (n) ceramic layer for extracting and steering light trapped in organic light-emitting diodes (LEDs). The hollow veins sustained by an ultrathin (35 nm in thickness) alumina wall were fabricated on a glass substrate by sequentially using nanoimprinting lithography, atomic layer deposition, and calcination processes, followed by sputtering a Si3N4 (n = 2.0) or TiO2 (n = 2.4) cover. A more pronounced scattering signal was revealed by dark-field imaging and scattering spectroscopy for the TiO2-cover sample. Measurements of photonic band dispersion via evanescent-field coupling demonstrated that the TiO2-cover sample surpassed the Si3N4-cover sample in extracting light trapped by total internal reflections in the glass substrate. The extraction efficiency of hollow vein embedded ceramic films was evaluated by conducting ray-wave integrated optics simulations on millimeter-scale (0.25 × 0.25 × 0.10 mm3) organic LEDs for covers with different n values. The incorporation of a cover with n = 2.4 maximized the extraction efficiency because of the dramatically enhanced top emission (i.e., a 2.8-fold enhancement relative to an unpatterned organic LED) through the glass substrate, thereby leading to a narrow beam angle of 30º.



中文翻译:

六角连接的亚微米空心静脉,可产生高效的窄束有机发射体

这项研究提出了覆盖有高折射率(n)陶瓷层的亚微米空心静脉的六边形阵列,用于提取和控制捕获在有机发光二极管(LED)中的光。通过依次使用纳米压印光刻,原子层沉积和煅烧工艺,随后溅射Si 3 N 4n  = 2.0)或TiO ,在玻璃基板上制造由超薄(厚度为35 nm)氧化铝壁支撑的空心静脉。2n  = 2.4)盖。TiO 2的暗场成像和散射光谱显示了更明显的散射信号-覆盖样品。通过e逝场耦合的光子带色散测量表明,在提取由玻璃基板中的全内反射所捕获的光时,TiO 2覆盖样品优于Si 3 N 4覆盖样品。通过在毫米级(0.25×0.25×0.10 mm 3)有机LED上进行射线波集成光学模拟,评估具有不同n值的覆盖层,对空心静脉嵌入式陶瓷膜的提取效率进行了评估。将封面与n合并 = 2.4使提取效率最大化,这是因为通过玻璃基板的顶部发射显着增强(即,相对于无图案有机LED的2.8倍增强),从而导致30º的窄光束角。

更新日期:2021-02-15
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