一类窄带隙芴基共聚物的合成及其在发光二极管和太阳电池中的应用  

FLUORENE-BASED COPOLYMERS FOR RED LIGHT-EMITTING DIODES AND BULK HETEROJUNCTION PHOTOVOLTAIC CELL

作　　者：孙明亮[1] 王藜[1] 夏养君[1] 杜斌[1] 刘然升[1] 曹镛[1] 

机构地区：[1]华南理工大学高分子光电材料与器件研究所教育部特种功能材料重点实验室,广州510640

出　　处：《高分子学报》2007年第10期952-958,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50433030);国家重点基础研究发展计划(973项目;项目号2002CB613404)资助项目

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/cm2.光敏曲线覆盖300 nm^700 nm.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.

关 键 词：9 9-二辛基芴 2 3-二甲基-5 8-二噻吩-喹喔啉 发光二极管 太阳电池 

分 类 号：TM914.4[电气工程—电力电子与电力传动]