Wearable sensing technologies are essential for personalized healthcare via continuously monitoring the surrounding information. Ultraviolet (UV) light, an important component of solar radiation, is recognized as the main inducement of skin cancers. So far, the use of rigid and costly technologies to fabricate UV sensors still hinders their implementation in wearable and portable electronics. Here we present a wearable UV wristband based on a self-powered flexible perovskite photodetector for real-time UV monitoring. Utilizing a solution-assisted halide exchange strategy, device based on CH₃NH₃PbCl₃ film exhibits excellent UV detection performance (high responsivity of 359.03 mA/W, fast rise/fall time of 3.91/4.55 ms), outstanding mechanical robustness (remaining over 80% of initial performance after 2500 bending cycles), as well as desirable operational stability (unchanged photoresponse under 500 h of continuous UV light soaking). Integrated with commercially available soft circuits, this fully flexible sensor system enables round-the-clock probing for UV radiation indoor and outdoor in conjunction with necessary environmental information, which can be displayed and recorded on a smartphone, to prevent prolonged UV exposure. The wearable platform not only paves the way for seamlessly integrated photodetectors, but also enables a wide range of personalized environmental and health monitoring applications.

通过持续监控周围信息，可穿戴传感技术对于个性化医疗保健至关重要。紫外线 (UV) 光是太阳辐射的重要组成部分，被认为是皮肤癌的主要诱因。到目前为止，使用刚性和昂贵的技术来制造紫外线传感器仍然阻碍了它们在可穿戴和便携式电子产品中的实施。在这里，我们展示了一种基于自供电柔性钙钛矿光电探测器的可穿戴紫外线腕带，用于实时紫外线监测。利用溶液辅助卤化物交换策略，基于 CH ₃ NH ₃ PbCl _3的设备薄膜具有出色的紫外检测性能（359.03 mA/W 的高响应度、3.91/4.55 ms 的快速上升/下降时间）、出色的机械稳定性（在 2500 次弯曲循环后仍保持超过 80% 的初始性能）以及理想的操作稳定性（在 500 小时的连续紫外光浸泡下没有改变的光响应）。这种完全灵活的传感器系统与市售的软电路集成，可以全天候探测室内和室外的紫外线辐射，并结合必要的环境信息，这些信息可以在智能手机上显示和记录，以防止长时间的紫外线照射。可穿戴平台不仅为无缝集成的光电探测器铺平了道路，而且还支持广泛的个性化环境和健康监测应用。