2024-04-26 11:00:05
The quest into creating intrinsically stretchable displays is on.
Traditional displays are constrained by rigid, inflexible components. It is therefore imperative to find innovative materials and device designs that can withstand significant stretching while maintaining functionality, which is essential for applications such as adaptable and wearable interface technologies.
Although the majority of flexible displays on the market use organic light-emitting diode (OLED) technology with materials organic as emitting components of lightthese often have disadvantages such as brightness limited and color purity issues. In contrast, quantum dot displays (QLED) offer excellent color reproduction, increased brightness, and longevity superior, making it an attractive choice for consumers who prioritize these criteria. However, the challenge for developing flexible QLED displays lies in the very nature of quantum dots (QDs). As inorganic nanoparticles, they do not possess inherent stretching properties. Attempts have been made to incorporate QDs into elastic materials to create an elastic, light-emitting composite material.
The Institute for Basic research team Science (IBS) led by Professor KIM Dae-Hyeong overcame these limitations by integrating a third material in the composite to improve the transmission of carriers to the QDs. A polymer semiconductorthe TFB, has been used to improve both device stretch and device efficiency.injection holes.
IBS researchers succeeded in obtaining QLEDs with high brightness (15,170 cd/m²), the highest among stretchable LEDs, as well as a low threshold voltage (3.2 V). Even when a force significant force was applied to stretch the material, the device was not damaged. Even when stretched to 1.5 times its size, there was no significant change in the distance between the quantum dots inside the device.
This research not only demonstrates the superior performance of QDs in stretchable displays, but also opens new avenues to further improve device performance. Future research will focus on optimizing carrier injection efficiency and stretching across all layers of the device. This discovery lays a solid foundation for next-generation QLED technology, promising a future where display technologies are not just flexible but truly stretchable, enabling new forms of wearable electronics.
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