中文摘要：

基于9,9-二辛基芴（DOF）与窄带隙单体2,3-二甲基-5,8-二噻吩-喹喔啉（DDQ）,通过Suzuki偶合反应,合成了一系列无规和交替窄带隙的芴基共聚物（PFO-DDQ）,并对它们的紫外-可见吸收光谱、光致发光光谱、电致发光性能和光伏性能进行了初步研究.共聚物在380 nm和490 nm处有两处明显的吸收峰,其中490nm处的吸收强度随着共聚物中窄带隙单元（DDQ）含量的增加而成比例加强.随着共聚物中窄带隙单元（DDQ）含量的增加,电致发光峰值从580 nm红移到了635 nm.基于该类材料的橙红或饱和红色发光二极管最大外量子效率为1.33%,流明效率为1.54 Cd/A.试验中观察到了窄带隙单元的能量陷阱机制.以窄带隙单元含量为30%的聚合物（PFO-DDQ30）为电子给体、PCBM为电子受体所制备的共混体相异质结太阳电池最大能量转换效率为1.18%,开路电压0.9 V,短路电流密度2.66 mA/cm^2.光敏曲线覆盖300 nm-700 nm.

英文摘要：

A series of low band-gap conjugated copolymers （PFO-DDQ） derived from 9,9-dioctylfluorene （DOF） and 2,3-dimethyl-5,8-dithien-2-yl-quinoxalines（DDQ） is prepared by the palladium-catalyzed Suzuki coupling reaction with the molar feed ratio of DDQ around 1% ,5 %, 15 %, 30% and 50%. The obtained polymers are readily soluble in common organic solvents. The solutions and the thin solid films of the eopolymers absorb light from 300- 590 nm with two absorbanee peaks at around 380 nm and 490 nm. The PL emission consists exclusively of DDQ unit emission at around 591 - 643 nm depending on the DDQ content in solid film. The EL emission peaks are red-shifted from 580 nm for PFO-DDQ1 to 635 nm for PFO-DDQ50. Efficient energy transfer due to exeiton trapping on narrowband-gap DDQ sites has been observed. The highest external quantum efficiency achieved with the device configuration ITO/PEDOT/PVK/PFO-DDQ15/Ba/Al is 1.33% with luminous efficiency 1.54 ed/A. Bulk heterojunetion photovoltaie cells fabricated from composite films of PFO-DDQ30 eopolymer and [ 6,6 ]-phenyl C61 butyric acid methyl ester （PCBM） as electron donor and electron aeeeptor, respectively in device configuration： ITO/ PEDOT： PSS/PFO-DDQ30 ： PCBM/PFPNBr/A1 shows power conversion effieieneies 1.18 % with open-circuit voltage （ Voc ） of 0.90 V and short-circuit current density （ Jsc ） of 2.66 mA/em2 under AM 1.5 solar simulator （ 100 mW/ em2）. The photoeurrent response wavelengths of the PVCs based on PFO-DDQ30/PCBM blends covers 300 - 700 nm. This indicates that these kinds of low band-gap polymers are promising candidate for polymeric solar ceils and red light-emitting diodes.