Light fidelity (LiFi), which is emerging as a compelling technology paradigm shifting the common means of high-capacity wireless communication technologies, requires wearable and full-duplex compact design because of its great significance in smart wearables as well as the ‘Internet of Things’. However, the construction of the key component of wearable full-duplex LiFi, light-emitting/detecting bifunctional fibres, is still challenging because of the conflicting process between carrier separation and recombination, as well as the highly dynamic film-forming process. Here, we demonstrate light-emitting/detecting bifunctional fibres enabled by perovskite QDs with hybrid components. The hybrid perovskite inks endow fibres with super-smooth QD films. This, combined with the small exciton binding energy and high carrier mobility of perovskite QDs, enables successful integration of electroluminescence and photodetection into monofilaments. The bifunctional fibres possess the narrowest electroluminescence full width at half maximum of ~19 nm and, more importantly, the capability for simultaneously transmitting and receiving information. The successful fabrication of narrow emission full-duplex LiFi fibres paves the way for the fabrication and integration of low crosstalk interoperable smart wearables.

光保真 (LiFi) 正在成为一种引人注目的技术范式，改变了大容量无线通信技术的常用方式，由于其在智能可穿戴设备以及“物联网”中具有重要意义，因此需要可穿戴式全双工紧凑型设计。 '。然而，由于载流子分离和复合之间的冲突过程以及高度动态的成膜过程，可穿戴全双工LiFi的关键部件——发光/检测双功能光纤的构建仍然具有挑战性。在这里，我们展示了由具有混合组件的钙钛矿量子点实现的发光/检测双功能纤维。混合钙钛矿墨水赋予纤维超光滑的量子点薄膜。再加上钙钛矿量子点的小激子结合能和高载流子迁移率，可以将电致发光和光电检测成功集成到单丝中。双功能纤维具有最窄的电致发光半峰全宽，约为 19 nm，更重要的是，具有同时传输和接收信息的能力。窄发射全双工 LiFi 光纤的成功制造为低串扰可互操作智能可穿戴设备的制造和集成铺平了道路。