Organic light-emitting diodes (OLEDs) are unique light sources with a promising potential even beyond display and lighting applications. The low-temperature processability of organic materials allows the fabrication of organic devices on plastic substrates, enabling deformable optoelectronic devices. In this talk, we present our group's progress on these deformable OLEDs. First of all, we report on a device architecture leading to fully encapsulated stretchable OLEDs with high performance. A straightforward yet highly effective fabrication method is provided based on laser-patterned substrates and stress-relieving layers. Secondly, we report on a revised architecture for OLED-based health-monitoring sensors that can measure blood oxygen level and heart rate. Finally, we introduce key engineering made for ultralow power consumption in these sensors.
Industrial promising structural colors based on subwavelength scale structure inevitably entail very high fabrication costs in artificial implementation. To reduce the costs, we fabricated the microstructure that necessary to realize the structural color through Au nano-islands, which can be manufactured by bottom-up chemical process instead of strict topdown process and developed a device that can adjust color quantitatively. Notably, this device has the color tunability through the refractive index of the solution that infiltrates the device and is expected to be used in the field of sensors or anti-counterfeiting devices.
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