Near-infrared emission of dinuclear iridium complexes with hole/electron transporting bridging and their monomer in solution-processed organic light-emitting diodes
作者:Zhaoran Hao、Min Li、Yajun Liu、Yafei Wang、Guohua Xie、Yu Liu
DOI:10.1016/j.dyepig.2017.09.061
日期:2018.2
To obtain efficient near-infrared (NIR) emitting materials, a novel iridium (III) complex based on a triphenylamine functionalized pyridylpyrene ligand, namely, Mono-Ir, as well as its two corresonding dinuclear iridium (III) complexes possessing π-conjugated bridging linkages of hole-transporting carbazole (Caz) unit or electron-transporting 2,5-diphenyl-1,3,4-oxadiazole (OXD) unit, namely D-Ir-Caz
为了获得有效的近红外(NIR)发射材料,一种新型的基于三苯胺官能化吡啶基ligand配体的铱(III)配合物,即Mono-Ir,以及其两个具有π共轭桥联的相应双核铱(III)配合物。成功合成并表征了空穴传输咔唑(Caz)单元或电子传输2,5-二苯基-1,3,4-恶二唑(OXD)单元的键,即D-Ir-Caz和D-Ir-OXD 。在光激发下,对于三种复合物获得了相似的磷光光谱,这些复合物在大约698 nm处具有很强的NIR发射峰,且发射波长在650至900 nm范围内。同样,在其具有ITO / PEDOT:PSS / TFB / CBP:PBD:complexes / TmPyPB / Liq / Al的器件结构的单发射层OLED中,获得了类似的NIR电致发光(EL)发射峰,峰值为698 nm,肩峰为762 nm。基于Mono-Ir的器件在3.5 mA cm的低电流密度下显示出1.29%的外部