Near infrared-emitting tris-bidentate Os(<scp>ii</scp>) phosphors: control of excited state characteristics and fabrication of OLEDs
作者:Jia-Ling Liao、Yun Chi、Chia-Chi Yeh、Hao-Che Kao、Chih-Hao Chang、Mark A. Fox、Paul J. Low、Gene-Hsiang Lee
DOI:10.1039/c5tc00204d
日期:——
tris-bidentate coordination mode. These Os(II) complexes [Os(N^N)(bipz)(pp2b)], N^N = bpy (3), phenanthroline (4), 3,4,7,8-tetramethyl-1,10-phenanthroline (5) and 4,7-diphenyl-1,10-phenanthroline (6), display near infrared (NIR) emission between 717 nm and 779 nm in the solid state at RT. On the basis of hybrid-DFT and TD-DFT calculations, the emissions are assigned to metal-to-ligand charge transfer transitions
一系列四个带有(i)发色二亚胺配体(N ^ N)的Os(II)配合物,例如2,2'-联吡啶(bpy)和取代的1,10-菲咯啉,(ii)从5,5'-二(三氟甲基)-2- ħ,2' ħ -3,3'- bipyrazole(bipzH 2),和(iii)双(phospholano)苯(PP2B)作为第三辅助配体完成配位层是合成的。X射线衍射研究证实了杂配的三齿双配位模式。这些Os(II)配合物[Os(N ^ N)(bipz)(pp2b)],N ^ N = bpy(3),菲咯啉(4),3,4,7,8-四甲基-1,10-菲咯啉(5)和4,7-二苯基-1,10-菲咯啉(如图6所示,在室温下在固态下显示在717nm和779nm之间的近红外(NIR)发射。根据混合DFT和TD-DFT计算,将排放分配给金属到配体的电荷转移过渡(3 MLCT),并混合少量配体到配体的电荷转移(3 LLCT)。使用Os(II)