Interfaces and pattern resolution of inkjet-printed organic light-emitting diodes with a novel hole transport layer

IF 3.7 3区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
D. Yoon, Y. Kang, R. Bail, B. Chin
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引用次数: 5

Abstract

In this paper, the effects of the combination of solvents on the uniformity of a dried emitting layer and on device performance were studied. Green emitter inks with various solvents were prepared, and it was seen that good film uniformity of printed layers could be obtained with a solvent mixture with different boiling points, which reduced the coffee ring effect on a dried surface. During the inkjet process, the drop injection condition aiming was also controlled for better drop-to-drop spacing and reduction of the line-edge roughness. Printed patterns of a small molecular/polymer hybrid emitting layer, composed of the chlorobenzene-dichlorobenzene solvent mixture, showed significantly reduced roughness of the microscopic surface and improved efficiency of the inkjet device, at levels nearly comparable to those of spin-coated patterns. A suitable hole transport layer (HTL) was also further developed as an interfacial material, prior to the solution processing of the emitter. The cross-linkable HTL was composed of triphenylamine as the cross-linking unit and a fluorene-based compound. At the optimized condition of the solvent formulation, printed droplets within 100 µm× 300 µm pixels formed a uniform stripe without remarkable coffee-ring defects and line-edge surface roughness.
具有新型空穴传输层的喷墨打印有机发光二极管的界面和图案分辨率
本文研究了溶剂组合对干燥发射层均匀性和器件性能的影响。制备了具有各种溶剂的绿色发射体油墨,结果表明,具有不同沸点的溶剂混合物可以获得良好的印刷层膜均匀性,这降低了干燥表面上的咖啡环效应。在喷墨过程中,还控制了液滴喷射条件瞄准,以获得更好的液滴间距和降低线边缘粗糙度。由氯苯-二氯苯溶剂混合物组成的小分子/聚合物混合发射层的印刷图案显示出微观表面的粗糙度显著降低和喷墨装置的效率提高,其水平几乎与旋涂图案的水平相当。在发射极的溶液处理之前,还进一步开发了合适的空穴传输层(HTL)作为界面材料。可交联HTL由作为交联单元的三苯胺和基于芴的化合物组成。在溶剂配方的优化条件下,打印的液滴在100 µm× 300 µm像素形成均匀条纹,没有明显的咖啡环缺陷和线条边缘表面粗糙度。
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
Journal of Information Display
Journal of Information Display MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.10
自引率
5.40%
发文量
27
审稿时长
30 weeks
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