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[International Conference] Highly Areal and Stretchable Patterned Structure by Rotating Plates for Stretchable OLED

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Stretchable devices are technologies that can be applied to the human body, such as wearable and biomedical

devices, due to their stretchability. A Stretchable optoelctronics require high areal density which is directly related

to device performance. A Stretchable organic light-emitting diodes(OLEDs) can be demonstrated using a mask

pattern that makes a patterned plate-bridge structure. The plate is the part that receives the least stress when

stretching. OLED are located and operated on the plate element. A bridge is an element that connects each plates

and is a part that deform when stretching is applied on stretchable devices. However, in order to have stretchable

plate-bridge structure, the range of bridge must be increased. A OLED area is decreased and the stretchability and

device performance are in a trage-off relationship.

In this work, We have studies the method of using plate-bridge structure to have higher stretchability even with

the same areal density. The plate-bridge structure has stretchability by connecting bridge between adjacent plates.

Therefore, when stretching, the plate is fixed and does not affect the stretchability. We change the connection of

the bridge and cause the plate to rotate when it was stretching. The rotation of the plate affects the increase in

stretchability. To ratate the plate, a torque must be applied to the plate through the bridge. Rotatonal torque is

generated by alternately connecting the bridge vertically and horizontally with respect to the stretch direction.

Under the same areal density, the rotational plate has a maximum stretchability of 35% and the fixed plate has a

maximum stretchability of 15%. The rotational plate extends more than 2 times as much as the fixed plate. In

additioni, when 10% stretching, the rotational plate holds 250,000 times. It is 100 times more durable than the

fixed plate. The roatioinal plates has 8000 times for stretching of 20%. Moreover, even if plate is rotated, the

stress applied to the plate is small. So, OLED receives less physical damage. Stretchable OLED devices can be

demonstrated by using a patterned substrate consisting of a rotational plates and bridges.