Park Byoungchoo, Park Jaewoo, Kim Wonsun, Na Seo Young, Huh Yoon Ho, Kim Mina, Choi Eun Ha
Department of Electrical and Biological Physics Kwangwoon University Wolgye-Dong Seoul 01897 South Korea.
Department of Plasma-Bio Display Kwangwoon University Wolgye-Dong Seoul 01897 South Korea.
Small Sci. 2022 May 9;2(7):2200017. doi: 10.1002/smsc.202200017. eCollection 2022 Jul.
High-performance solution-processable light-emitting diodes (LEDs) attract much research interest due to the very high complexity of conventional vacuum-processed LEDs. A simple single-inkjet-printing process using a phase-separable material combination is presented. With single-inkjet printing of an ink containing semiconducting compounds on a phase-separable insulating layer, convective and Marangoni flows in sessile droplets can produce microinlaid spots through the site-selective etching of the insulating layer and the simultaneous self-filling of the semiconductors in the etched vacancies. As a proof of concept, microinlaid organic LEDs (OLEDs) with a spatial resolution of ≈200 dpi in a phase-separable poly(4-vinylpyridine) layer without any conventional preformation of bank-like structures are produced. The fabricated green microinlaid OLEDs exhibit excellent performance with maximum brightness of ≈13 000 cd m and maximum efficiency of ≈14.2 cd A. Moreover, large-area inkjet-printed OLEDs are simply realized using the microinlaid spot arrays. These results demonstrate that the inkjet-inlay structure is a promising candidate for high-performance next-generation solution-processable LEDs.
高性能溶液可加工发光二极管（LED）因传统真空加工LED的高度复杂性而备受研究关注。本文提出了一种使用相分离材料组合的简单单喷墨打印工艺。通过在相分离绝缘层上对含有半导体化合物的墨水进行单喷墨打印，固着液滴中的对流和马兰戈尼流可通过绝缘层的位点选择性蚀刻以及蚀刻空位中半导体的同时自填充产生微镶嵌点。作为概念验证，在无相分离聚（4-乙烯基吡啶）层中制备了空间分辨率约为200 dpi的微镶嵌有机发光二极管（OLED），且未进行任何传统的类似堤岸结构的预成型。所制备的绿色微镶嵌OLED表现出优异的性能，最大亮度约为13000 cd m，最大效率约为14.2 cd A。此外，利用微镶嵌点阵列可简单实现大面积喷墨打印OLED。这些结果表明，喷墨镶嵌结构是高性能下一代溶液可加工LED的一个有前景的候选方案。
