作　　者： ; ; ; ; ; ;

机构地区： 华南理工大学材料科学与工程学院特种功能材料教育部重点实验室

出　　处： 《高分子学报》 2009年第9期845-851,共7页

摘　　要： 合成了一种3,4-位为三苯胺的新型silole单体(TST)及其与N-己基-3,6-咔唑(Cz)组成的共聚物PCz-TST,其中TST的含量变化为1%~20%.PCz-TST的重均分子量介于9000~10600之间,而多分散系数在1.3~1.5之间.研究了共聚物的吸收光谱、电化学性质、光致发光光谱、以及电致发光性能.PCz-TST的主吸收峰位于305 nm,归属于咔唑链段的贡献,而TST单元的吸收出现在498 nm.4种PCz-TST的光学带隙在2.06~2.18eV之间,其光致发光光谱具有明显的能量转移特征,固态薄膜能发出单一的橙光,而电致发光峰位进一步红移,在604~645 nm之间.PCz-TST的HOMO能级在-4.99^-5.12 eV之间,与典型的空穴阻挡层TPBI能形成大于1.0 eV的空穴势垒.在器件结构为ITO/PEDOT/PCz-TST/TPBI/Ba/Al的聚合物发光二极管中,TPBI层能限制激子复合区域并提高复合效率,表现了来自silole单元的高效率电致红光,其中5%TST含量的共聚物获得了1.94%的最大外量子效率.TPBI的引入还导致了电致发光光谱的红移,从而改善了红光的色纯度. A new 2,5-dithienylsilole （TST） with triphenylamine substituents at the 3,4-positions was synthesized. The TST was utilized to construct conjugated silole-eontaining poly（3,6-carbazole）s PCz-TST with TST contents of 1%- 20%. The weight-average molecular weights of the PCz-TST were between 9000 and 10600, with polydispersity index between 1.3 and 1.5. Optoclectronic properties of the PCz-TST, such as UV absorption, cyclic voltammetry, photoluminescence （PL） and eleetroluminescence （EL） were investigated. The main absorption peaks of PCz-TST, which were ascribed to the contribution of the carbazole segments, were at 305 nm, while the absorption of the TST units was around 498 nm. The optical band gaps of the PCz-TST were between 2.06 - 2.18 eV. PL spectra of the copolymers showed excitation energy transfer from the carbazole segments to the silole units, displaying one orange peak for the film PL spectra. The peak positions of red EL spectra were between 604 - 645 nm, showing obvious red-shifts relative to the PL spectra. HOMO levels of PCz-TST were between - 4.95 eV and - 5.09 eV, with more than 1 eV energy barrier for holes to enter TPBI blocking layer. In EL devices with a configuration of ITO/ PEDOT/PCz-TST/TPBI/Ba/AI,a maximum external quantum efficiency of 1.94% was achieved for the copolymer with 5 % TST. The TPBI hole blocking layer largely improved the efficiency of the exciton formation, from which the highly efficient red EL from the silole units could be displayed. Red shifted EL spectra were found for the introduction of the TPBI layer, from which the color purity of red light was modified.

关 键 词： 聚 咔唑 共聚物 聚合物发光二极管

领　　域： [电子电信] [电气工程]