Inkjet droplet deposition dynamics into square microcavities for OLEDs manufacturing
Inkjet droplet deposition dynamics into square microcavities for OLEDs manufacturing
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DOI：
10.1007/s10404-018-2068-y
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发表时间：
2018-04
影响因子：
2.8
通讯作者：
Lei Zhang;Tao Ku;Xiaoding Cheng;Yan Song;Dingyi Zhang
中科院分区：
文献类型：
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作者：
Lei Zhang;Tao Ku;Xiaoding Cheng;Yan Song;Dingyi Zhang
利用大密度比的三维多松弛时间伪势晶格玻尔兹曼（LB）模型研究了方形微腔中喷墨沉积的动力学。在伪势LBM框架内考虑几何格式以获得所需的接触角。探讨了润湿性、密度比、液滴粘度和冲击速度对微腔相互作用的影响。随着微腔接触角的增大，识别并分析了带小圆点的冠状形状、圆形空心芯、均匀膜和凸膜等物理结果。在较低的密度比ρr= 11.6时，周围密度较大的气体抑制液滴反冲流动，导致空心核增大。适当提高液滴粘度和减小冲击速度可以消除后坐阶段的空芯现象，使喷墨沉积过程更加直观。揭示液滴-微腔动力学特性，有助于优化喷墨沉积工艺，制备均匀的oled面板。
The dynamics of inkjet deposition in square microcavities are investigated utilizing a three-dimensional multi-relaxation-time pseudopotential lattice Boltzmann (LB) model with large density ratios. A geometric scheme is considered within the pseudopotential LBM framework to obtain the desired contact angles. The effects of wettability, density ratios, droplet viscosity and impact velocity are explored to reveal the droplet–microcavity interactions. With the contact angles of microcavity increasing, the physical outcomes including the crown-like shape with a small round dot, circular hollow core, uniform film and convex film are identified and analyzed. At a lower density ratioρr= 11.6, the surrounding denser gas resists the droplet recoiling flow resulting in an increasing hollow core. The appropriate higher droplet viscosity and decreasing impact velocity are preferred which could eliminate the hollow core in the recoiling phase and accelerate the inkjet deposition process straightforward. The revelation of droplet-microcavity dynamics is beneficial for optimizing inkjet deposition process and fabricating uniform OLEDs panels.