Abstract
A diamine ligand having an electron-pulling oxadiazole ring in its molecular structure was synthesized. Its Cu(I) complex was established using PPh3 as an auxiliary ligand. Geometric structure, electronic transition and photophysical feature of this Cu(I) complex were reported and discussed in detail. It followed a traditional tetrahedral coordination field and suffered from geometric relaxation badly. Aiming at an effective limitation for this geometric relaxation, this Cu(I) complex was immobilized into a polymer matrix via electrospinning technique. A full comparison between solid sample, solution sample and composite sample suggested that such geometric relaxation was effectively limited by polymer immobilization effect. A detailed analysis indicated that polymer host offered a rigid and protective microenvironment for dopant molecules, limiting their geometric relaxation in excited state. As a consequence, photophysical performance was improved, including emission blue shift, long emissive lifetime and improved photostability.
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