In-situ fabricated hexagonal PDMS microsphere arrays for substrate-mode light extraction in blue fluorescent organic light emitting diodes

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Polymer Pub Date : 2024-11-07 DOI:10.1016/j.polymer.2024.127796
Yanqiong Zheng , Chenchen Li , Bingjia Zhao , Siqi Zhang , Xuande Yang , Qingyu Zhang , Ryota Kabe , Xifeng Li
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Abstract

To inhibit the total reflection in the substrate-mode light loss of organic light-emitting diodes (OLEDs) and fully take advantage of the excellent light converging and out-coupling effect of the hexagonal array of microsphere, we in-situ fabricated the hexagonal array of polydimethylsiloxane (PDMS) microsphere onto the substrate of OLEDs via the porous template for substrate-mode light extraction. Firstly, regular honeycomb porous polystyrene (PS) template was prepared via a self-assembly “breath figure” process. The PS molecular weight, solvent, and humidity play an important role on the uniformity of pore distribution and pore diameter according to Young-Laplace equation. Based on the optimized porous PS template, the PDMS microsphere array was fabricated by pattern transferring, which indicates more prominent light diffraction than the flat PDMS film. Finite-difference time-domain (FDTD) simulation denotes that higher duty ratio of the PDMS microsphere array contributes to higher light out-coupling efficiency. Therefore, a PDMS microsphere array with larger duty ratio of 84.0 % was applied in the extraction of external light for the blue fluorescent OLED device. The maximum luminance, current efficiency, and power efficiency are all improved, and the external quantum efficiency (EQE) is increased by 18.81 % with spectral stability.

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用于蓝色荧光有机发光二极管基底模式光萃取的原位制造六边形 PDMS 微球阵列
为了抑制有机发光二极管(OLED)基底模式光损耗中的全反射,充分利用六方阵列微球优异的聚光和外耦合效应,我们通过多孔模板在 OLED 基底上原位制备了六方阵列聚二甲基硅氧烷(PDMS)微球,用于基底模式光提取。首先,通过自组装 "呼吸图 "工艺制备了规则的蜂窝状多孔聚苯乙烯(PS)模板。根据 Young-Laplace 方程,聚苯乙烯的分子量、溶剂和湿度对孔隙分布的均匀性和孔径有重要影响。在优化的多孔 PS 模板基础上,通过图案转移法制备了 PDMS 微球阵列,与平整的 PDMS 薄膜相比,该阵列的光衍射更为突出。有限差分时域(FDTD)仿真表明,PDMS 微球阵列的占空比越高,光外耦合效率越高。因此,占空比为 84.0% 的 PDMS 微球阵列被用于蓝色荧光 OLED 器件的外部光提取。最大亮度、电流效率和功率效率都得到了提高,外部量子效率(EQE)提高了 18.81%,且光谱稳定。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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