State-of-the-art Tb-to-Eu energy transfer (TEET) efficiency (>90%) under ultralow Eu³⁺ proportion (<6%) has been achieved in Eu/Tb bimetallic lanthanide coordination polymers (LnCPs). The yellow-light-emitting sample as sensor exhibits micromolar l-phenylalanine (l-Phe) in water and serum via obvious yellow-to-green luminometric behavior, meanwhile nanomolar-level detection limits are determined in terms of an updated Stern-Volmer equation with high selectivity and competitiveness. Excited-state inter-ligand photon transfer (ESILPT) greatly contributes to superior TEET property and outstanding luminometric behavior. This work opens a window for developing sensitive and stable visualization sensing, being of values on monitoring biochemical markers.

在 Eu/Tb 双金属镧系元素配位聚合物 (LnCPs) 中，在超低 Eu ³⁺比例 (<6%)下实现了最先进的 Tb-to-Eu 能量转移 (TEET) 效率 (>90% )。作为传感器的黄色发光样品通过明显的黄绿色发光行为在水和血清中表现出微摩尔L-苯丙氨酸 ( L -Phe)，同时根据更新的 Stern-Volmer 方程确定纳摩尔级检测限具有高选择性和竞争力。激发态配体间光子转移 (ESILPT) 极大地促进了卓越的 TEET 性能和出色的发光性能。这项工作为开发灵敏稳定的可视化传感打开了一个窗口，具有监测生化标志物的价值。