Fuzhou University Li Fushan's team prepared quantum dot LEDs with resolution beyond the limit of the human eye

The team of Professor Li Fushan of Fuzhou University and researcher Qian Lei of Ningbo Institute of Materials used a combination of ordered molecular self-assembly technology and transfer printing technology to propose a new strategy to suppress leakage current of high-resolution devices, and prepared high-performance Ultra-high-resolution quantum dot light-emitting diodes

In recent years, driven by emerging concepts such as "metaverse" and smart medical care, next-generation displays have set higher standards for pixel resolution to meet the ever-escalating application needs of massive information and AR/VR displays

In this paper, the researchers used the ordered molecular self-assembly technology to realize the dense and defect-free quantum dot monolayer film, and combined the transfer printing technology to realize the ultra-high-resolution quantum dot display of sub-micron pixels, and the highest resolution reached ~ 25000PPI (human eye limit resolution is about 300PPI)

It is worth mentioning that the research team first proposed to embed a honeycomb patterned non-light-emitting charge blocking layer between the light-emitting quantum dot pixels.

According to reports, this new high-resolution patterning method can further realize full-color display in the future

(a) Schematic diagram of the LB-TP process; (b) Optical microscope image of the microstructured PDMS stamp; (cd) Scanning electron microscope image of the microstructured PDMS stamp (diameter, spacing and height are all 500 nm)