Opto-Electro Functional Materials And Devices Based On Transition Metal(Re,Ru) Complexes

Recently, there has been growing interesting in employment of transition metal complexes as emitters in organic light-emitting diodes (OLEDs), since many of them have excellent photoluminescence (PL) properties and potential advantages of achieving a maximum internal quantum efficiency of 100%. Highly efficient OLEDs based on the Ir complexes and Pt complexes have been extensively studied. Little attention has been devoted to Re(I) complexes. It is well known that they feature high room-temperature phosphorescence quantum yield, relatively short excited state lifetime, and excellent thermal stability. Study these complexes is important to exploit novel types of EL materials and understand the EL mechanism deeply. On the other hand, as an application of organic photovoltaic devices, organic ultraviolet photodetectors present the advantages of low manufacturing cost, large detection area, and easy hybridization, and promise to integrate together with other electronic or optical components including chemical/biomedical analysis, full color digital image sensing and high energy radiation detection.In this work, red organic light-emitting diodes using a rhenium(I) bipyridyl complex, fac-[ClRe(CO)3(trans-4-methyl-4'-(2-4-octadecyloxylphenyl)vinyl)-2,2'- bipyridine] as an emitter were fabricated. The optimized device has a bilayer structure of indium-tin oxide/poly(N-vinylcarbazole): x wt.-% Re-mopvb/2,9-dimethyl-4,7-diphenyl-,10-phen anthroline/LiF/Al. It was found that no photoluminescence from Re-mopvb in room- temperature solution appeared due to photoinduced isomerization, a bright red electrophosphorescence from an intraligand excited state of Re-mopvb was observed at room temperature, indicating promising future of such a class of EL materials. It is helpful to exploit novel types of EL materials. DPPz derivatives have excellent electron-transporting property. Highly efficient orange-yellow organic EL devices based on DPPz have been fabricated. By incorporating Re-DPPz into EL devices with balanced charge injection and efficient host-to-guest energy transfer, the EL performances were significantly improved. For EL device with 7 wt. % Re-DPPz doped emissive layer, maximum efficiency of 6.3 cd/A, and orange-yellow emission with brightness approaching 1000 cd/m2 were achieved. Such improvement is due to efficient Dexter energy transfer between CBP host and Re-DPPz.Metal-DPPz complexes and m-MTDATA were used as electron-acceptors and donors, respectively in the PV devices. The performance of ultraviolet-A photodetectors based on PV has been investigated. The forming of exciplexes makes UV detectors better capability. The absorption spectra of the composite films located at long wave UV area, typical visible-blind UV detector. It indicates that DPPz-containing metal complexes not only possess excellent EL performances, but only find applications in sensors.New surfactant Ru(II) complexs were synthesized and characterized by elemental analysis,mass spectra and 1H NMR. The complex– water mixture displays lyotropic liquid crystalline behaviour. The mesoporous films obtained still retain the corresponding texture of...