Abstract: Electroluminescent yarn has been a research hotspot in recent decades due to its extensive prospect in the field of intelligent display applications, such as human-computer interaction and emergency warning. The basic principle of electroluminescence is the phenomenon of electric current excitation to produce light, specifically when the current passes through some specific materials, it will excite the electronic energy level transition in the material, thereby emitting visible or near-infrared light. However, the DC drive mode of organic light-emitting diodes and quantum dot-based light-emitting diodes limits their practical application. This is because unidirectional DC flow can lead to unfavorable charge accumulation at high current densities. In addition, power loss is unavoidable. Therefore, AC-driven electroluminescent devices have attracted attention for various applications.
At present, the main preparation methods of luminescent fibers include integrated circuit method, spraying method and intercalation method. The integrated circuit method is mainly achieved by integrating luminescent materials, electrode fibers and other components; The spraying method is to spray the luminescent material in the form of a solution or powder on the conductive wire, and encapsulate it with an insulating material; The embedding method is mainly prepared by embedding luminescent materials into yarns. However, in the molding process of light-emitting optical fiber, there are inevitably shortcomings such as time-consuming production process and high cost, which greatly limits the large-scale production of outgoing light-emitting optical fiber and restricts its practical application. Therefore, there are still significant challenges in developing a cost-effective and feasible method to manufacture luminescent fibers/yarns.
Therefore, in this paper, a parallel electrode electroluminescent yarn structure is designed, and a parallel electrode electroluminescent yarn is prepared by using zinc sulfide doped copper (ZnS: Gu) electroluminescent composite material as the luminescent layer and conductive silver-plated yarn as the flexible electrode. The luminous yarn can reach a brightness of up to 161.71 cd/m2 (700 V, 8 kHz), and PELF  - 60%has good wearing performance and water insulation properties, which can be used for water rescue and warning clothing, and has a broad application prospect in visual interaction and environmental warning.

Key words: electroluminescent yarn, visual interaction, smart wearable, water rescue

摘要： 为了开发一种结构简单、高光亮的交流电致发光器件，采用硫化锌掺杂铜（ZnS:Cu）电致发光复合材料作为发光层，导电镀银纱线作为柔性电极，设计了一种平行电极式电致发光纱线。同时研究了电致发光颗粒含量对发光纱线的表面形貌、发光性能、耐摩擦性能、发光稳定性能等的影响。结果表明：所制备的电致发光纱线在电压和频分别为700V和8kHz时的最大光亮度达到161.71 cd/m2，同时随着频率的逐渐增大，发光波长可从513 nm变化到453 nm，具有出色的发光稳定性能、耐摩擦性能和力学性能。此外，发光纱线可在水下工作稳定，水下光亮度保持率保持在100% ± 2%，具有水上应急救援警示的应用潜力。该研究结果可为新型交流电致发光纱线的制备提供新思路，制备的电致发光纱线在视觉交互和环境示警方面具有一定的应用前景。

关键词: 电致发光纱线, 平行式电极, 智能显示, 智能可穿戴, 水上救援