Polymer light-emitting displays with printed cathodes
Polymer light-emitting displays with printed cathodes
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具有印刷阴极的聚合物发光显示器
DOI：
10.1016/j.surfcoat.2018.11.041
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发表时间：
2019-01
影响因子：
5.4
通讯作者：
Hua Zheng
中科院分区：
文献类型：
--
作者：
Hua Zheng
通过精细阴极沉积和多功能缓冲层制备相结合，实现了具有印刷阴极的高分辨率无源矩阵聚合物发光显示器。与其他印刷方法和印刷材料不同，喷墨导电纳米颗粒作为阴极可以提供高分辨率的阴极图案和沿着精细阴极线的优异连续性，而无需对有机层施加任何机械压力。通过将水/醇溶性聚合物聚[9，9-双（3′-（N，N-二甲氨基）丙基）-2，7-芴-alt-2，7-（9，9-二辛基芴）]（PFNR 2）与可固化环氧粘合剂混合来制备印刷阴极与有机活性层之间的缓冲层。它具有防溶剂、电子注入和与阴极墨水有适当亲和力的功能。交联缓冲层在改善器件性能，特别是大幅度阻断漏电流的同时，也引起了一种新的“线性η-Jplot”现象，可以得到有趣而真实的结果。内容格式为96 × 3 × 64的红色、绿色和蓝色单色和全色聚合物发光显示器既不显示死像素也不显示死线。在优化的固化步骤下，纳米银油墨形成连续、无缺陷、低电阻的阴极排，没有任何变形。红色、绿色和蓝色显示器分别表现出0.62、4.38和0.93 cd/A的电流效率和（0.63，0.37）、（0.39，0.57）和（0.18，0.16）的CIE色坐标。阴极印刷技术消除了对阴极金属热蒸发的高真空的需要，这可能导致工业卷对卷工艺来制造平板显示器。
High-resolution passive-matrix polymer light-emitting displays with printed cathodes are achieved by combining delicate cathode deposition and multifunctional buffer layer fabrication. Unlike other printing methods and printed materials, ink-jetting conducting nano-particles as cathode can provide high-resolution cathode patterns and excellent continuity along the fine cathode lines without any mechanical pressure on the organic layers. The buffer layer between the printed cathode and the organic active layers, was fabricated by mixing the water/alcohol-soluble polymer poly[9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene-alt-2,7-(9,9-dioctylfluorene)] (PFNR2) and a curable epoxy adhesive. It offers the functions of solvent-proof, electron-injection, and proper affinity with the cathode ink. While improving the performance of devices, especially blocking the leakage current greatly, the cross-linked buffer layer also induces a novel phenomenon of ‘linearη-Jplot’, which can be derived to interesting and realistic results. Red, green, and blue monochrome and full-color polymer light-emitting displays with a content format of 96 × 3 × 64 show neither dead pixels nor dead lines. Under optimized steps of curing, the nano silver ink forms continuous, defect-free, and low-resistance cathode rows without any distortion. The red, green, and blue displays exhibit the current efficiencies of 0.62, 4.38 and 0.93 cd/A, and CIE color coordinates of (0.63, 0.37), (0.39, 0.57) and (0.18, 0.16), respectively. The cathode printing technique removes the need of high vacuum for thermal evaporation of the cathode metal, which could lead to the industrial roll-to-roll process to manufacture the flat panel displays.
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