The main challenge in the development of luminescent lanthanide complexes lies in the design of organic ligands. Herein, a carboxyl-terminated aromatic hyperbranched polyester (CHBPE) ligand was designed and synthesized, which has abundant branched end groups for chelating lanthanide ions, strong light-harvesting ability in the UV region, and more importantly, good energy match with the Tb³⁺ ion. The structure of CHBPE was characterized by MALDI-TOF MS, elemental analysis, FTIR, ¹H NMR, ¹³C NMR, and UV-Vis absorption measurements. Subsequently, a Tb³⁺ complex (CHBPE-Tb³⁺-Phen) based on CHBPE was obtained, in which Phen was used as a co-ligand to protect Tb³⁺ ions and reduce non-radiative transition of Tb³⁺ ions. The as-prepared complex was analyzed by MALDI-TOF MS, elemental analysis, ¹³C NMR, FTIR and UV-Vis methods. The results demonstrated that both CHBPE and Phen coordinated to Tb³⁺ ions and a stable chelate structure was formed. The synergistic effect of CHBPE and Phen made the complex exhibit remarkably strong green luminescence corresponding to the Tb³⁺ ion upon UV excitation. The efficiency of energy transfer (Φ_sen) from the CHBPE to Tb³⁺ ion was 55.2%, revealing that CHBPE is well suitable for the sensitization of Tb³⁺ ions. The absolute quantum efficiency (Φ_overall) and luminescence lifetime (τ_obs) of the complex were 27.5% and 0.28 ms, respectively. The possible energy transfer pathways in the complex system were proposed. The complex is expected to have potential application in the near ultraviolet light emitting diode (NUV-LED).

中文翻译：

---

使用新设计的芳香族超支化聚酯作为有效的天线配体的绿色发射emitting复合物

开发发光镧系元素络合物的主要挑战在于有机配体的设计。本文设计并合成了一种羧基末端的芳香族超支化聚酯（CHBPE）配体，该配体具有丰富的螯合镧系离子的支链端基，在紫外区具有很强的光吸收能力，更重要的是与Tb ³具有良好的能量匹配性。⁺离子。CHBPE的结构通过MALDI-TOF MS，元素分析，FTIR，¹ H NMR，¹³ C NMR和UV-Vis吸收测量进行了表征。随后，获得基于CHBPE的Tb ³⁺络合物（CHBPE-Tb ³⁺ -Phen），其中Phen被用作共配体以保护Tb ³⁺离子并减少Tb ³⁺离子的非辐射跃迁。通过MALDI-TOF MS，元素分析，¹³ C NMR，FTIR和UV-Vis方法分析制备的配合物。结果表明，CHBPE和Phen均与Tb ³⁺离子配位，并形成了稳定的螯合物结构。CHBPE和Phen的协同作用使该配合物在UV激发下表现出与Tb ³⁺离子相对应的显着强绿色发光。能量转移（效率Φ_仙从CHBPE到tb）³⁺离子为55.2％，表明CHBPE非常适合于Tb的致敏³⁺离子。绝对量子效率（Φ_整体）和发光寿命（ τ _OBS复合物）分别为27.5％和0.28毫秒。提出了复杂系统中可能的能量传递途径。该配合物有望在近紫外发光二极管（NUV-LED）中具有潜在的应用。