期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 13, 页码 10213-10219出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501521p
关键词
flexible organic light-emitting diode; nanotextured substrate; colloidal lithography; thermal nanoimprint; light extraction
资金
- NSFC Major Research Plan on Nanomanufacturing [91323303, 51175417]
- China's National 863 High-Tech Program [2012AA041004]
- Fundamental Research Funds for the Central Universities
High-efficiency organic light-emitting diodes (OLEDs) have generated tremendous research interest. One of the exciting possibilities of OLEDs is the use of flexible plastic substrates, which unfortunately have a mismatching refractive index compared with the conventional ITO anode and the air. To unlock the light loss on flexible plastic, we report a high-efficiency flexible OLED directly fabricated on a double-sided nanotextured polycarbonate substrate by thermal nanoimprint lithography. The template for the nanoimprint process is a replicate from a silica arrayed with nanopillars and fabricated by ICP etching through a SiO2 colloidal spheres mask. It has been shown that with the internal quasi-periodical scattering gratings the efficiency enhancement can reach 50% for a green light OLED, and with an external antireflection structure, the normal transmittance is increased from 89% to 94% for paraboloid-like pillars. The OLED directly fabricated on the double-sided nanotextured polycarbonate substrate has reached an enhancing factor of similar to 2.8 for the current efficiency.
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