Energy transfer as an important component in light-harvesting antenna systems can mimic effectively natural photosynthesis processes, showing great potential in optoelectronic devices. Herein, we report a responsive polymeric hydrogel based on the combination of excited state intramolecular proton transfer (ESIPT) molecule (Salicylic acid, Sal) and terbium (III) (Tb³⁺), as enabled by external stimuli to construct artificial light-harvesting antenna systems. Benefiting from unique photophysical properties of Sal, the synthesized hydrogel displays a temperature-dependent reversible opaque ↔ transparent states transition, accompanied with an interesting photoluminescence behavior. Moreover, by further incorporating europium (III) (Eu³⁺) into the hydrogel, we demonstrate well-defined cascades of energy transfer that provides a tunable optical output from the collection of lanthanides by the excitation of a common sensitizer (Sal) upon base vapor stimulation. Efficient energy transfer efficiency from Tb³⁺ to Eu³⁺, as high as 97.8%, was also obtained as established by the time-resolved fluorescence spectroscopy analysis.

能量传输作为集光天线系统的重要组成部分，可以有效地模拟自然光合作用过程，在光电器件中显示出巨大的潜力。在此，我们报告了一种基于激发态分子内质子转移 (ESIPT) 分子 (水杨酸, Sal) 和铽 (III) (Tb ³⁺ ) 组合的响应性聚合物水凝胶，可通过外部刺激构建人工捕光天线系统。受益于 Sal 独特的光物理特性，合成的水凝胶表现出与温度相关的可逆不透明 ↔ 透明状态转变，并伴随着有趣的光致发光行为。此外，通过进一步掺入铕 (III) (Eu ³⁺) 到水凝胶中，我们展示了定义明确的能量传递级联，通过在基础蒸汽刺激下激发常见的敏化剂 (Sal)，从镧系元素的集合中提供可调谐的光学输出。^{Tb 3+}到Eu ³⁺的高效能量转移效率也达到了97.8%，这也是通过时间分辨荧光光谱分析确定的。