Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku Sapporo, Hokkaido, 060-8628, Japan.
Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Kita 21, Nishi 10, Kita-ku Sapporo, Hokkaido, 001-0021, Japan.
Chempluschem. 2022 Oct;87(10):e202200151. doi: 10.1002/cplu.202200151. Epub 2022 Jul 13.
Molecular photosensitizers provide efficient light-absorbing abilities for photo-functional materials. Herein, effective photosensitization in excited-state equilibrium is demonstrated using five Tb coordination polymers. The coordination polymers are composed of Tb ions (emission center), hexafluoroacetylacetonato (photosensitizer ligands), and phosphine oxide-based bridges (ancillary ligands). The two types of ligand combinations induces a rigid coordination structure via intermolecular interactions, resulting in high thermal stability (with decomposition temperatures above 300 °C). Excited-triplet-state lifetimes of photosensitizer ligands (τ=120-1320 μs) are strongly dependent on the structure of the ancillary ligands. The photosensitizer with a long excited-triplet-state lifetime (τ≥1120 μs) controls the excited state equilibrium between the photosensitizer and Tb , allowing the construction of Tb coordination polymer with high Tb emission quantum yield (≥70 %).
分子光增感剂为光功能材料提供了高效的光吸收能力。在此，通过五个铽配位聚合物展示了在激发态平衡中的有效光增感作用。配位聚合物由铽离子（发射中心）、六氟乙酰丙酮（光增感配体）和基于氧化膦的桥（辅助配体）组成。两种配体组合通过分子间相互作用诱导刚性配位结构，导致高的热稳定性（分解温度高于 300°C）。光增感配体的激发三重态寿命（τ=120-1320 μs）强烈依赖于辅助配体的结构。具有长激发三重态寿命（τ≥1120 μs）的光增感剂控制光增感剂和铽之间的激发态平衡，允许构建具有高铽发射量子产率（≥70%）的铽配位聚合物。
