Effect of inkjet-printed quantum dots microstructure morphology on the performance of light guide plate

Abstract

Light guide plate (LGP) with quantum dots (QDs) microstructure is commonly prepared by screen printing, but the morphology of microstructure cannot be precisely controlled. Inkjet printing is an emerging technology that allows accurate positioning and controlled print droplet morphology, which can effectively solve this problem. However, studies on the preparation of QDs microstructure LGP using inkjet printing are rare, and the relationship between the morphology of inkjet-printed QDs microstructure and the performance of LGP is still unclear. Based on the above hotspots and challenges, this study systematically explores the effect of inkjet-printed QDs microstructure morphology on LGP performance by adjusting process parameters and combining with simulation models. Specifically, the ideal radial length and height ratio of the microstructure was firstly obtained as 25 by ray-tracing simulation optimization with Lighttools. In addition, the morphology of individual QDs microstructure was optimized using the limiting effect of UV glue. Finally, based on the optimized process parameters and structure explored above, the printing parameters were adjusted. QDs microstructures with regular distribution, uniform size and smooth edges were obtained. The luminance uniformity of LGP made from them was 85.35%, and it had good current stability and thermal stability. It is expected that these findings will shed some new lights on large-scale application of QDs microstructure LGP.