Department of Chemical and Biological Engineering, Gachon University , Seongnam, Gyeonggi-do 13120, Republic of Korea.
Center for Nanoparticle Research, Institute for Basic Science (IBS) , Seoul 08826, Republic of Korea.
ACS Nano. 2017 Jun 27;11(6):5992-6003. doi: 10.1021/acsnano.7b01894. Epub 2017 May 26.
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations. A graphene electrode is adopted to ensure extreme bendability of the devices. Ultrathin QD light-emitting diodes and QD photodetectors are transfer-printed onto a prestrained elastomeric layout to form wavy configurations with regular patterns. The layout is mechanically stretchable until the structure is converted to a flat configuration. The emissive and active area itself can be stretched or compressed by buckled structures, which are applicable to wearable electronic devices. We demonstrate that these stretchable optoelectronic sensors can be used for continuous monitoring of blood waves via photoplethysmography signal recording. These and related systems create important and unconventional opportunities for stretchable and foldable optoelectronic devices with health-monitoring capability and, thus, meet the demand for wearable and body-integrated electronics.
可拉伸和可延展的光电设备在显示器、生物传感器、生物医学、机器人和能源生成等领域具有潜在应用。在实现可穿戴显示器和生物医学设备时，使用具有优异光学性能的纳米材料（如量子点 (QD)）非常重要，但应优先考虑特定的结构设计和材料选择，以实现这些设备的可拉伸形式。在这里，我们报告了使用胶体量子点制造的可拉伸光电传感器，并与弹性体基板集成，其光电性能在各种变形下都保持稳定。采用石墨烯电极以确保器件具有极高的柔韧性。将超薄 QD 发光二极管和 QD 光电探测器转移打印到预拉伸的弹性布局上，形成具有规则图案的波浪形配置。该布局具有机械可拉伸性，直到结构转换为平面配置。发射和有源区域本身可以通过褶皱结构进行拉伸或压缩，这适用于可穿戴电子设备。我们证明，这些可拉伸光电传感器可用于通过光电容积描记信号记录来连续监测血流波。这些和相关系统为具有健康监测功能的可拉伸和可折叠光电设备创造了重要的和非常规的机会，从而满足了对可穿戴和体内集成电子产品的需求。
