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新型含硒杂环红光聚芴电解质的电致发光器件制备和研究
Fabrication and Study of Electroluminescent Devices Made from Novel Red Light-emitting Polyelectrolytes Consisting of Polyfluorene Derivatives and Selenium Heterocyclic Rings

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: 《液晶与显示》 2006年第2期134-138,共5页

摘  要: 利用新型的聚[9,9-二辛基芴-9,9-(双(3′-(N,N-二甲基)-N-乙基铵^+溴^-)丙基)芴-4,7-二噻吩-2-基-2,1,3-苯并硒二唑](PFNBr—DBse)共扼聚电解质制备了聚合物发光二极管。这类共扼聚电解质可用乙醇等溶剂成膜,不仅可代替传统的甲苯等芳香性非极性溶剂,而且有利于制备溶液型的多层显示器件。文章研究了这类新型聚电解质的光致发光特性及发光二极管器件的电荧光特性。研究表明在紫外光照射或电激发下,窄带系的DBse链段通过俘获激子能够实现有效的能量转移。聚电解质中DBSe的含量在5%以上,其器件具有电致发光峰值为700-740nm的饱和红光发射。所制聚电解质器件在用铝作电极时的电致发光效率比用钡作电极时要高。 Polymer light-emitting diodes (PLED) were fabricated using novel conjugated polyelectrolytes poly [9, 9-dioctylfluorene-9,9-(bis(3'- (N, N-dimethyl)- N-ethylammonium bromide) propyl) fluorene 4,7-dithienyl-2,1,3-benzoselenadiazole] (PFNBr-DBSe). Instead of conventional aromatic and apolar solvents, such as toluene, ethanol was able to dissolve these novel materials for spin coating film, which in turn favored the manufacture of solution processing multilayer display devices. Photophysical and electroluminescent properties of the series of copolymers were investigated. It was found that under ultraviolet illumination or electrical excitation, efficient energy transfer occurred by excitons being trapped on the narrow band-gap DBSe site. A saturated red electroluminescence peaked at around 700-740 nm for the devices made from polyelectrolytes with DBSe content equal to or greater than 5 %. In particular, these polyelectrolytes exhibited better device performance when high work function metal A1 served as cathode in place of low work function metal Ba.

关 键 词: 聚合物发光二极管 二辛基芴 二甲基 乙基铵 丙基 二噻吩 苯并硒二唑 共扼聚电解质

领  域: [电子电信]

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