Acta Photonica Sinica ›› 2019, Vol. 48 ›› Issue (6): 616001-0616001.doi: 10.3788/gzxb20194806.0616001

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Morphology Controlling of Quantum Dots Thin Films Prepared by Inkjet Printing

LEI Xiao-xiao, YE Yun, LIN Nan, CHEN En-guo, GUO Tai-liang   

  1. College of Physics and Telecommunication Engineering, Fuzhou University, Fuzhou 350100, China
  • Received:2019-01-15 Online:2019-06-25 Published:2019-03-14
  • Supported by:

    National Key Research and Development Program of China (No. 2017YFB0404604), Natural Science Foundation of Fujian Province (No. 2018J01802)

Abstract:

Based on the microfluidic theory, the drying process of film printed with polyacrylate-QD inks was studied. Besides,the coffee ring effect was overcome by optimizing solvent ratio, polymer content and drying temperature to improve the morphology of the array films. The results showed that the addition of high boiling point solvent is helpful to delay the outward flow of droplets on the substrate. Adjusting polymer content can change the physical properties of the inks, which is beneficial to induce inward flow and hinder outward flow. In addition, the polymer can ameliorate the smoothness of the films because of the leveling effect. Both of them can significantly improve the morphology of coffee ring. Moreover, adjusting drying temperature can optimize the pinning of contact line between droplet and substrate, thus further improving the morphology of coffee ring. Finally, the uniform quantum dot films and quantum dot arrays with diameters of 169 μm and heights of 65 nm were prepared at the quantum dot concentration of 12 mg/mL, the volume ratio of chlorobenzene/cyclohexyl benzene in ink is 8:2, the mass percentage of polyacrylate is 11wt%, and the drying temperature is 25℃, which provides basic technical support for the fabrication of QLED devices and the full-color of Micro-LED panels.

Key words: QD films, Polymer, Solvent ratio, Drying temperature, Inkjet printing

CLC Number: