Synthesis And Photoelectrical Properties Of Novel Polymers Catalyzed By Metal Complexes

Organic conjugated polymers have been used as an organic optoelectronic functionalmaterials successfully in organic electroluminescent, organic solar cells and other fields, because ofsimple preparation process, low economic cost, flexible manufacture and regulated structure. In theorganic electroluminescent areas, the planar display technologies represented by light emittingdiodes have commercial applications at a certain degree, but the red and blue materials still havemany disadvantages, which are bad for the large-scale industrialization. In the field of organicpolymer solar cells, the photoelectronic conversion efficiency has been over11%, but the scope forcommercial application standard is still much improvement. Thus, the exploitation of novel organicconjugated polymers which have excellent optical properties is still the focus in the field. In thisthesis commences, the study mainly around fluorene, benzothiadiazole, carbazole and perylenediimides, several different organic optoelectronic materials had been designed and synthesized.The main contents are as listed as follows:1、In chapter2, a novel benzothiadiazole derivative (DHTBT) was designed and synthesized.Then, after it was introduced into polyfluorene by Suzuki reaction catalyzed under P/Pd complex, akind of new copolymers(PFO-DHTBT) containing different benzothiadiazole derivative contentswere synthesized and characterized by FT-IR, NMR and GPC. Besides, the optical,electrochemical and thermal properties of these copolymers were studied by TGA, UV-vis, PL andCV. The results show that copolymers have high molecular weights and good thermal stability.The relative emission of DHTBT unit increased with the DHTBT unit content increasing,suggesting that efficient Forster energy transfer from the fluorene unit to the DHTBT unit havehappened. Additionally, when excited under certain conditions, the copolymers can emit asaturated red light about625nm. Hence, they have the potential to be used as a red light emittingluminescent materials applied in the field of polymer light-emitting materials.2、In chapter3, three carbazole derivatives containing different alkyl chains were designedand synthesized. Then, after they were coupled with DHTBT unit by Suzuki reaction catalyzedunder P/Pd complex, a kind of new copolymers (PC-DHTBT) containing different alkyl chainswere synthesized and characterized by FT-IR, NMR and GPC. Besides, the optical,electrochemical and thermal properties of these copolymers were studied by TGA, UV-vis, PL and CV. The results show that copolymers have high molecular weights, good thermal stability, lowoptical band gap (1.9eV)and suitable HOMO level (-5.4eV) and LUMO level (-3.5eV).Additionally, efficient fluorescence quenching phenomenon have happened in the solid film.Hence, they have the potential to be applied in active layer materials of PSCs.3、In chapter4, a novel perylene diimide derivative (PDI) was designed and synthesized.Then, after it was coupled with carbazole units by Suzuki reaction catalyzed under P/Pd complex, akind of new copolymers (PC-PDI) containing different alkyl chains were synthesized andcharacterized by FT-IR, NMR and GPC. Besides, the optical, electrochemical and thermalproperties of these copolymers were studied by TGA, UV-vis, PL and CV. The results show thatcopolymers have low optical band gap (1.6eV), and the absorption bands of copolymers span awide range of the visible spectra. the HOMO and LUMO energy level of PC-PDI is about-5.4eVand-3.8eV, respectively. Additionally, complete fluorescence quenching phenomenon havehappened in the solid film. Hence, they have the potential to be used as a electron donatingmaterials applied in active layer materials of PSCs.