Flexible PDMS/Al2O3 Nanolaminates for the Encapsulation of Blue OLEDs

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Interfaces Pub Date : 2021-09-21 DOI:10.1002/admi.202100872

Yun Li, Yingfei Xiong, Weiran Cao, Qianqian Zhu, Yuan Lin, Yinghao Zhang, Mengjia Liu, Fan Yang, Kun Cao, Rong Chen

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引用次数: 11

Abstract

In this work, the polydimethylsiloxane (PDMS)/Al₂O₃ nanolaminates with optimized sublayer thickness and interfaces have been developed to protect the organic light-emitting didoes (OLEDs) from the erosion of the moisture in the ambient. The O₂ plasma pretreatment is used to tune the wettability of the ultrathin PDMS sublayers with nanoscale thickness, and the distinct interfaces between the Al₂O₃ and PDMS sublayers are obtained. The electrical calcium test is exploited to evaluate the barrier properties of the encapsulation nanolayers, and the water vapor transmission rate (WVTR) value of the 2.5 PDMS/Al₂O₃ dyads can reach the range of ≈10⁻⁵ g m⁻² day⁻¹. The mechanical stability of the nanolaminates is further improved by introducing the top epoxy layer, which helps move the neutral axis (NA) to the center of the barrier, and the applied external strain decreases significantly. Compared with the sample without the epoxy layer, a slighter increase of the WVTR value of the multilayered encapsulation films with optimized NA position is obtained. Furthermore, the operational lifetime of blue OLEDs encapsulated with the multilayered encapsulation films improves from 6 to more than 370 h, which shows significantly improved stability and reliability.

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用于蓝色oled封装的柔性PDMS/Al2O3纳米层合材料

在这项工作中，开发了具有优化亚层厚度和界面的聚二甲基硅氧烷(PDMS)/Al2O3纳米层合材料，以保护有机发光二极管(oled)免受环境中水分的侵蚀。采用氧等离子体预处理对具有纳米厚度的超薄PDMS亚层的润湿性进行了调整，得到了Al2O3与PDMS亚层之间明显的界面。采用电钙法评价了包封纳米层的阻隔性能，发现2.5 PDMS/Al2O3二元体的水蒸气透过率(WVTR)可达≈10−5 g m−2 day−1。通过引入顶部环氧树脂层，纳米层合板的机械稳定性进一步提高，这有助于将中性轴(NA)移动到屏障的中心，并且施加的外部应变显著降低。与未添加环氧树脂层的样品相比，优化NA位置的多层封装膜的WVTR值略有增加。此外，多层封装膜封装的蓝色oled的使用寿命从6小时提高到370小时以上，其稳定性和可靠性得到了显著提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Materials Interfaces CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.40

自引率

5.60%

发文量

1174

审稿时长

1.3 months

期刊介绍： Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018. The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface. Advanced Materials Interfaces covers all topics in interface-related research: Oil / water separation, Applications of nanostructured materials, 2D materials and heterostructures, Surfaces and interfaces in organic electronic devices, Catalysis and membranes, Self-assembly and nanopatterned surfaces, Composite and coating materials, Biointerfaces for technical and medical applications. Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.