材料沉积喷墨打印及
涂层系统解决方案

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基于喷墨打印技术的高效全溶液处理量子点发光二极管

发布时间:2017-08-02
发布人:

Abstract

Quantum dot light emitting diodes (QLEDs) are increasingly attractive owing to their compatibility with ink-jet printing process and the potential application in low-cost large-area full-color pixelated display. The strategy for controlling the morphology of quantum dot layer is definitely critical for realizing all-solution processed QLEDs with high performance, which certainly requires in-depth thinking regarding the design of ink composition and their optimization in the printing process. Herein, by carefully controlling the quantum dot ink composition and physicochemical properties, we demonstrate that the viscosity, contact angle and the three-phase contact line moving would affect the final morphology of quantum dots film formed by inkjet printing. We achieved coffee-ring-free and low-roughness quantum dots film and all solution-processed QLEDs with normal structure were fabricated for the first time. The devices have a low turn-on voltage of 2.0 V, a luminance of 12100 cd/m2 at the voltage of 12 V and a maximum current efficiency of 4.44 cd/A at the luminance of 1974 cd/m2, which is the best result to date for inkjet-printed red QLEDs. The results will pave the way for future application of inkjet printing in solution-processed pixelated QLED display.

Yang L ,  Li F ,  Xu Z , et al. Efficient All-solution Processed Quantum Dot Light Emitting Diodes Based on Ink-jet Printing Technique.[J]. ACS Applied Materials & Interfaces, 2017, 9(30):25506.