The organic light-emitting devices (OLEDs) sealed by optically clear adhesives (OCAs) always face the risk of luminescence loss due to the formation of dark spots caused by the oxygen attack, for which the poor oxygen barrier property of the OCAs is responsible. To address this issue, a new type of acrylate-based OCAs matrix was initially synthesized; then the modified boron nitride (mBN) was integrated to create a physical “passive” barrier, and hydroxyl-terminated polybutadiene (HTPB) as an efficient chemical “active” oxygen scavenger was also introduced to prepare acrylate-based OCAs with superior oxygen barrier property. The oxygen permeability coefficient is as low as 4.76 cc·mil·m^–2·day^–1·0.1 MPa^–1, which is 35.61 times lower than that of the unmodified acrylate matrix, due to the synergistic barrier effect of mBN and HTPB. Even after 6 months, the OCAs still maintain a good oxygen barrier performance, with an oxygen permeability coefficient of 103.43 cc·mil·m^–2·day^–1·0.1 MPa^–1. The OCAs also exhibit excellent water barrier performance (11.26 g·mil·m^–2·day^–1), high light transmittance (>87%), strong peeling force (13.5 N/25 mm), and a remarkable strain recovery ratio (73%). When testing the luminous performance of OLEDs at room temperature, the working time of OLEDs sealed by our OCAs corresponding to a 5% decrease in relative luminous efficiency is extended by 10 h, compared to that of OLEDs sealed by commercial adhesives. Furthermore, when the OLEDs are stored at 85 °C for 7 days, the OLEDs sealed by our OCAs still exhibit luminous performance comparable to that of ones by commercial adhesives. Thus, this work presents a novel approach to prepare OCAs with outstanding comprehensive performance, especially the excellent oxygen barrier property, showing the significant potential for OLEDs sealing.

中文翻译：

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丙烯酸酯光学透明胶粘剂，具有优异的氧阻隔性，适用于有机发光器件


由光学透明粘合剂 （OCA） 密封的有机发光器件 （OLED） 总是面临因氧侵蚀而形成黑点而发光损失的风险，而 OCA 的氧阻隔性能差是造成这种情况的原因。为了解决这个问题，最初合成了一种新型的基于丙烯酸酯的 OCAs 基质;然后，将改性氮化硼 （mBN） 集成以形成物理“被动”屏障，并引入羟基封端聚丁二烯 （HTPB） 作为高效的化学“活性”除氧剂，以制备具有优异氧阻隔性能的丙烯酸酯基 OCA。由于 mBN 和 HTPB 的协同阻隔效应，透氧系数低至 4.76 cc·mil·m^–2·day^–1·0.1 MPa^–1，比未改性丙烯酸酯基体低 35.61 倍。即使在 6 个月后，OCAs 仍保持良好的氧阻隔性能，透氧系数为 103.43 cc·mil·m^–2·day^–1·0.1 MPa^–1。OCA 还表现出优异的防水性能 （11.26 g·mil·m^–2·day^–1）、高透光率 （>87%）、强剥离力 （13.5 N/25 mm） 和显着的应变恢复率 （73%）。在室温下测试 OLED 的发光性能时，与用商业粘合剂密封的 OLED 相比，由我们的 OCA 密封的 OLED 的工作时间（对应于相对发光效率降低 5%）的工作时间延长了 10 小时。此外，当 OLED 在 85 °C 下存放 7 天时，由我们的 OCA 密封的 OLED 仍表现出与商业胶粘剂相当的发光性能。 因此，这项工作提出了一种制备具有出色综合性能的 OCA 的新方法，尤其是优异的氧阻隔性能，显示出 OLED 密封的巨大潜力。