Near-infrared to violet triplet–triplet annihilation fluorescence upconversion of Os(<scp>ii</scp>) complexes by strong spin-forbidden transition
作者:Yaxiong Wei、Min Zheng、Lin Chen、Xiaoguo Zhou、Shilin Liu
DOI:10.1039/c9dt02276g
日期:——
Three Os(II) complexes were synthesized with ligands 2,2′-dipyridyl (dipy), 1,10-phenanthroline monohydrate (phen), and 4,7-diphenyl-1,10-phenanthroline (diphen), and applied as triplet photosensitizers for triplet–triplet annihilation (TTA) fluorescence upconversion. The strong spin-orbital coupling made direct spin-forbidden transition of S0–T1 feasible. Lifetimes of the lowest triplet state of these
合成了三种Os(II)配合物,分别带有配体2,2'-联吡啶(dipy),1,10-菲咯啉一水合物(phen)和4,7-二苯基-1,10-菲咯啉(diphen),并用作三重态用于三重态-三重态an灭(TTA)荧光上转换的光敏剂。强大的自旋轨道耦合使得S 0 –T 1发生自旋禁止跃迁。可行的。使用纳秒瞬态吸收光谱,确定这些复合物的最低三重态的寿命分别为Os-dipy,Os-phen和Os-diphen的107 ns,373 ns和386 ns。从稳态磷光发射光谱,对于Os-dipy,Os-phen和Os-diphen,三重态的能量分别为1.75 eV,1.80 eV和1.74 eV。使用这些光敏剂,在可见光至紫光范围内观察到三重态受体9,10-二苯基蒽(DPA),per和9,10-双(苯乙炔基)蒽(BPEA)的强烈上转换荧光。尤其是,对于Os-phen / DPA系统,观察到最大反斯托克斯位移为1