期刊
SMALL METHODS
卷 6, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202101509
关键词
high-resolution; microdisplays; micro-OLEDs; templated dewetting
资金
- National Natural Science Foundation of China [62074040, 62074045]
- Natural Science Foundation of Shanghai [20ZR1404000]
The emergence of near-eye displays has increased the demand for highly enhanced display resolution. High-resolution micro-displays using micro-organic light-emitting diodes (micro-OLEDs) are a preferred candidate due to the advantages of OLEDs, such as flexibility, light weight, and ease of processing. Researchers have demonstrated a solution-processing approach to pattern organic semiconductors (OSCs) for micro-OLED arrays, achieving pixel sizes as small as 1 µm. This method offers a potential avenue for cost-effective manufacturing of flexible and high-resolution micro-displays.
The emergence of near-eye displays, such as head-mounted displays, is triggering a requirement for highly enhanced display resolution. High-resolution micro-displays with micro-organic light-emitting diodes (micro-OLEDs) can be a preferential candidate, owing to the mature industrialization of OLEDs along with the advantages of flexibility, light weight, and ease of processing. However, micro-OLEDs with pixel sizes down to micrometers are difficult to be achieved using conventional techniques such as fine metal mask evaporation and lithography. Here, a solution-processing approach to pattern organic semiconductors (OSCs) for micro-OLED arrays with the assistance of templated dewetting is demonstrated. Solvents containing organic functional materials are dewetted on the surface with hydrophobic/hydrophilic patterns to form ordered droplet arrays using dip-coating. Subsequently, patterned OSC films are produced by effectively controlling solvent evaporation. Micro-OLED arrays with a pixel size down to 1 mu m are successfully fabricated by further deposition of emitting/electron transport layers and top electrodes. This approach can open an avenue for low-cost manufacturing of flexible and high-resolution micro-displays.
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