Light Extraction Efficiency Enhancement of White Organic Light-Emitting Diodes (OLEDs) by Micro/Nano-Patterning the Substrate Layer

Q4 Physics and Astronomy Defect and Diffusion Forum Pub Date : 2024-03-25 DOI:10.4028/p-bx2ouv

Md. Shamim Ahsan, Md. Arif Istiaq Arafat, Tasmima Akter, I. Sohn, Hun-Kook Choi

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Abstract

We demonstrate the enhancement of light extraction efficiency of surface-emitting white Organic Light Emitting Diodes (OLEDs) by incorporating micro/nano-metric structures on the outer surface of the 3-layer substrate (SiO2-Si3N4-SiO2). To enhance light extraction efficiency of the OLEDs, various light scattering structures including plano-convex & plano-concave micro-lens array, flat-top & round-top nano-pillars array, and wavy structures were engraved on the outer surface of the substrate layer. For optimization, we varied the thickness of the internal layers of the OLEDs, and height, width, period, and radius of the micro/nano-scale structures. The performance of the micro/nano-structured OLEDs was simulated and analyzed using Lumerical FDTD and GPVDM simulators. We examined the far field light intensity, transmitted power, angular distribution of light, photon escape probability, photon density, internal & external quantum efficiency, and current-voltage curve of the designed OLEDs. We investigated the results in different locations, especially after the substrate layer: Far Field-1 (0 μm), and Far Field-2 (2.5 μm). Compared to conventional OLEDs, the micro/nano-structured OLEDs showed higher external quantum efficiency. The highest external quantum efficiency of 67.304% (Far Field-1) was detected in the round-top nano-pillars array engraved white OLED having structure period of 1.2 μm. We strongly believe that, the proposed micro/nano-structured white OLEDs are suitable for lighting applications.

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通过微/纳米图案化基底层提高白色有机发光二极管 (OLED) 的光提取效率

我们展示了通过在三层基底（SiO2-Si3N4-SiO2）的外表面加入微米/纳米结构来提高表面发光白光有机发光二极管（OLED）的光萃取效率。为了提高有机发光二极管的光萃取效率，我们在基底层的外表面雕刻了各种光散射结构，包括平凸和平凹微透镜阵列、平顶和圆顶纳米柱阵列以及波浪形结构。为了优化，我们改变了 OLED 内部层的厚度，以及微米/纳米级结构的高度、宽度、周期和半径。我们使用 Lumerical FDTD 和 GPVDM 模拟器模拟和分析了微米/纳米结构 OLED 的性能。我们考察了所设计的有机发光二极管的远场光强、透射功率、光的角度分布、光子逃逸概率、光子密度、内部和外部量子效率以及电流-电压曲线。我们研究了不同位置的结果，尤其是衬底层之后的位置：远场-1（0 μm）和远场-2（2.5 μm）。与传统的有机发光二极管相比，微/纳米结构的有机发光二极管显示出更高的外部量子效率。结构周期为 1.2 μm 的圆顶纳米柱阵列雕刻白光 OLED 的外部量子效率最高，达到 67.304%（Far Field-1）。我们坚信，所提出的微/纳米结构白光有机发光二极管适用于照明应用。

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来源期刊

Defect and Diffusion Forum Physics and Astronomy-Radiation

CiteScore

1.20

自引率

0.00%

发文量

127

期刊介绍： Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.