Gil Yolimar, de Santana Ricardo Costa, de Camargo Andréa Simone Stucchi, Merízio Leonnam Gotardo, Carreño Patricia Farías, Fuentealba Pablo, Manzur Jorge, Spodine Evgenia
Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, 8380544, Santiago, Chile.
Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, 74690-900, Goiânia, GO, Brazil.
Dalton Trans. 2023 Mar 7;52(10):3158-3168. doi: 10.1039/d2dt03447f.
Considering the structural design of some of the scarce molecular-based Er-centred emitters in the literature, we explored the optical properties of three Er hexaazamacrocyclic complexes, namely Er-EDA (1), Er-OPDA(2) and Er-DAP(3). The macrocyclic ligands in these complexes differ in the lateral spacers, and are derived from 2,6-pyridine-dicarbaldehyde and ethylenediamine (EDA), -phenylenediamine (OPDA) or 1,3-diaminopropane (DAP). Upon ligand-centred excitation, the bluish-green and green emissions of the Er ion were detected only for the complexes containing macrocycles with aliphatic spacers (1 and 3), which evidenced that these ligands can sensitize the Er luminescence. On the other hand, the ligand derived from the aromatic diamine (2) does not sensitize the Er luminescence. Energy transfer mechanisms, temperature sensing, CIE coordinates and CCT values were analyzed. Besides the excitation in the ligands, the erbium-centred excitation at 980 nm allowed the detection, in all cases, of bluish-green, green and red up-converted emissions, and also the downshifted NIR emission. The possible mechanisms involved in these transitions were described and analyzed according to the available data.
考虑到文献中一些稀有的基于分子的铒中心发光体的结构设计，我们研究了三种铒六氮大环配合物的光学性质，即铒-乙二胺（1）、铒-邻苯二胺（2）和铒-1,3-二氨基丙烷（3）。这些配合物中的大环配体在侧链间隔基上有所不同，它们衍生自2,6-吡啶二甲醛和乙二胺（EDA）、邻苯二胺（OPDA）或1,3-二氨基丙烷（DAP）。在以配体为中心的激发下，仅在含有带有脂肪族间隔基的大环的配合物（1和3）中检测到了铒离子的蓝绿色和绿色发射，这证明这些配体可以敏化铒发光。另一方面，衍生自芳香族二胺的配体（2）不能敏化铒发光。分析了能量转移机制、温度传感、CIE坐标和CCT值。除了配体中的激发外，在980nm处的以铒为中心的激发在所有情况下都能检测到蓝绿色、绿色和红色的上转换发射，以及下移的近红外发射。根据现有数据描述并分析了这些跃迁中可能涉及的机制。
