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Lee Kwang-hyung, the President of Korea Advanced Institute of Science and Technology (KAIST), announced that a team of researchers led by Professor Kyung-chul Choi from the School of Electrical Engineering has successfully developed a waterproof, transparent, and flexible OLED using MXene nanotechnology. Even when exposed to water, this OLED can emit light and display images.

 

This achievement was made possible through a collaborative research effort with Dr. Lee Yong-hee from the Institute for Advanced Nanoscience.

 

Two-dimensional MXene materials exhibit high conductivity and permeability and possess characteristics that enable large-scale production through solution processing. However, their electrical performance is susceptible to degradation from moisture or water in the air, making it challenging to utilize them in long-lasting electronic devices.

The research team has developed a long-lasting OLED based on MXene, employing an "encapsulation" strategy to prevent oxidation. A dual-layer encapsulation film has been designed to block moisture while maintaining flexibility. Additionally, a plastic film with a thickness of tens of micrometers (um) is applied on top, allowing for washability.

 

They have developed an MXene-based red (R)/green (G)/blue (B) OLED with a brightness (luminance) of 1000 cd/m2 or higher, making it visible even in outdoor settings.

 

For MXene-based red OLEDs, they exhibit a standby shelf-life of 2000 hours (maintaining 70% brightness), a standby driving lifespan of 1500 hours (maintaining 60% brightness), and flexibility with a bending radius as low as 1.5 millimeters, enabling over 1000 curvature bends. Furthermore, even after being immersed in water for six hours, they still maintain 80% of their brightness.

 

The research team has also utilized patterning techniques to produce MXene-based OLEDs in the form of passive matrices, enabling the display of letters and shapes, showcasing transparent displays.

 

Professor Kyung-cheol Choi stated, "We anticipate its applicability in various fields such as vehicle displays, fashion, and functional clothing."

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