A New Era in OLED Displays: Stretchable OLED Developed Without Brightness Loss
Combining flexibility with brightness in display technologies has long been a challenging goal. The newly developed OLED structure, however, has significantly altered this balance for the first time.
Researchers from Drexel University and Seoul National University have developed a new OLED display technology that can stretch up to twice its original size without losing brightness in the process. This work could be a milestone for smartphones, wearables, and integrated displays.
Stretchable OLED Without Brightness Loss
At the heart of the new research are ultra-thin conductive materials called MXene. MXene layers, which combine metal-like electrical conductivity with polymer flexibility, offer a much more durable structure compared to indium tin oxide (ITO) electrodes that have been used in OLEDs for many years. While ITO is effective on flat surfaces, it cracks under strain, limiting flexible use cases.
The researchers managed to overcome this problem by using MXene films, only about 10 nanometers thick, as transparent electrodes. The display maintains its conductivity under mechanical stress while also sustaining high brightness levels. According to measurements, the system achieved an external quantum efficiency of 17 percent. This value is among the highest ever recorded for naturally stretchable OLEDs.
The team made innovations not only on the electrode side but also in the organic layer structure of the OLED. A new layer that enables more efficient redirection of positive charges and a second layer that reuses energy likely to be converted into heat both increase the screen's brightness and stability. The resulting structure can be used in areas such as smart products, textiles, soft robotic systems, industrial displays, and health monitors that can be applied directly to the skin.
Researchers believe that such displays could go beyond classic smartwatches in the future. However, the main challenge to be solved before commercialization is the protection of OLEDs against moisture and oxygen. Existing encapsulation solutions mostly rely on rigid materials. Therefore, mass production seems difficult without developing a long-lasting and flexible protective layer.
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