超低粘度胶体量子点电流体喷印的微滴成形竞争行为与调控

Quantum dots with excellent luminescent properties, solution processing and efficient manufacturing characteristics, have broad applications in information, biology, energy etc., and they are expected to bring significant technological change in the field of information display. According to the requirements of high resolution and high uniformity manufacturing for quantum dots pixels, this project explores a new method to direct write ultra-low viscosity colloidal quantum dots through electrohydrodynamic printing technique. The rheological behavior of nanocomposite ink will be studied under the effect of a high potential electric field, and the competition between droplet formation and atomization for ultra-low viscosity ink will be revealed, to obtain the process window for stable microdroplet injection; The influences of process parameters on the jet fracture will be established, and controlled injection of micro/nano droplet with specific frequency/volume will be realized; Collaborative optimization of process parameters, substrate and environment will be applied to control the spreading and evaporation of droplets, nano thin films with high resolution and high uniformity will be prepared and integrated into quantum dot light emitting diodes to verify their function. The above researches may provide the theoretical and technological foundation for high resolution patterning in quantum dot display.

量子点以其优异的发光特性及可溶液化高效制造等特点，在信息、生物、能源等领域具有广阔应用前景，尤其在信息显示领域，有望带来重大技术变革。本项目针对量子点像素的高分辨率、高均匀一致性制造要求，探索基于电流体喷印技术直写超低粘度胶体量子点的制造新方法。研究高压电场作用下纳米复合墨液的场致流变行为，揭示超低粘度墨液微滴成形和分裂雾化间的竞争关系，获得稳定微滴喷射的工艺窗口；建立工艺参数对射流断裂行为的影响模型，实现特定频率/体积微纳液滴的可控喷射；协同优化电喷印参数、基板及环境参数控制液滴在基板上的流动铺展及蒸发固化，制备高分辨率、高度均匀一致的纳米薄膜，并用于量子点发光二极管进行功能验证，为量子点显示高分辨率图案化制造提供关键的理论与技术支撑。

量子点以其优异的发光特性及可溶液化高效制造等特点，在信息、生物、能源等领域具有广阔应用前景，尤其在信息显示领域，有望带来重大技术变革。本项目针对量子点像素的高分 辨率、高均匀一致性制造要求，探索基于电流体喷印技术直写超低粘度胶体量子点的制造新方法。建立泰勒锥锥尖形成和断裂过程模型，研究高压电场作用下纳米复合墨液的场致流变行为，揭示超低粘度墨液微滴成形规律，获得稳定微滴喷射工艺窗口；建立工艺参数对射流断裂行为的影响模型，实现特定频率/体积微纳液滴的可控喷射；协同优化电喷印参数、基板及环境参数控制液滴在基板上的流动铺展及蒸发固化，抑制咖啡环现象，实现高分辨率、高度均匀一致的纳米薄膜制备，并用于量子点发光二极管进行功能验证，为量子点显示高分辨率图案化制造提供关键的理论与技术支撑。在Advanced Functional Materials、Polymers、Journal of Materials Chemistry C等期刊发表SCI论文6篇，申请/授权国家发明专利5项，出版《Electronhydrodynamic Direct-Writing for Flexible Electronic Manufacturing》（Springer出版社）专著1部，电流体喷印方面的工作获2017年湖北省自然科学一等奖。