The development of tenacity photoluminescent (PL) hydrogels is very great significance to promote the application of optical technology in hydrogel. Herein, we report a high-toughness PL hydrogel that combines synthetic hydrophilic lanthanide complex (LCs) and tannic acid (TA) with polyvinyl alcohol (PVA) by frozen-thawing. The resulting hydrogel has high mechanical strength (1194.46-kPa tensile strength, 1266.17-kJ m−3 toughness energy, 1915.58-kPa compressive strength, and 269.79-kJ m−3 energy dissipation at 80% compression), excellent self-recover and anti-fatigue performance, good photoluminescence, and switchable functions under UV light, showing red (254 nm) and green (365 nm), respectively. The design strategy offers a new approach for the preparation of multifunctional and tenacity PL hydrogels.

中文翻译：

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一种用于构建具有韧性、自恢复和双色可调性的光致发光水凝胶的双交联策略

韧性光致发光（PL）水凝胶的开发对于促进光学技术在水凝胶中的应用具有非常重要的意义。在此，我们报告了一种高韧性 PL 水凝胶，它通过冻融将合成亲水镧系元素络合物 (LC) 和单宁酸 (TA) 与聚乙烯醇 (PVA) 相结合。所得水凝胶具有高机械强度（1194.46-kPa 拉伸强度、1266.17-kJ m-3 韧性能、1915.58-kPa 抗压强度和 269.79-kJ m-3 80% 压缩能量耗散）、优异的自恢复和抗- 疲劳性能、良好的光致发光和紫外光下的可切换功能，分别显示红色（254 nm）和绿色（365 nm）。该设计策略为制备多功能和坚韧的 PL 水凝胶提供了一种新方法。