科研之友
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摘要
The morphology of quantum dots（QDs）films fabricated by inkjet printing makes a marked impact on the performance of multi-layer photoelectronic devices，such as quantum dot light emitting diodes，where coffee-ring and bulge phenomena behave as the typical poor morphology types. Realizing high-quality QDs films through droplet modulation is key to the development of QDs electroluminescent displays. Ink engineering has been proven effective in adjusting the film morphology. However，a well-tailored ink with precise rheological properties to eliminate coffee ring or bulge requires multiple time-consuming experimental attempts，resulting in lower working efficiency. In this work，we sought to directly bridge the gap between the rheological properties of solvents and the profiles of inkjet-printed QDs films with post-mortem film analysis and machine learning methods adopted for mutual proof. With red QDs as the solutes，and alkanes or chain esters as solvents，work on unitary-solvent and binary-solvent ink systems was investigated to find out that generally，the boiling point of the used solvent displayed significant importance high? er than that of surface tension or viscosity in both unitary and binary systems. Specifically，the film profile was close? ly related to the solvent with a higher boiling point in binary systems and uniform films were revealed. A boiling point range of 250-265 ℃ for the solvent in the unitary-solvent ink system or for the higher-boiling-point solvent in the bi? nary-solvent ink systems can promisingly result in uniform films after drying. ? 2023 Chines Academy of Sciences.
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