Single layer light-emitting diodes from copolymers comprised of mesogen-jacketed polymer containing oxadiazole units and PVK
Single layer light-emitting diodes from copolymers comprised of mesogen-jacketed polymer containing oxadiazole units and PVK
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由含有恶二唑单元和 PVK 的介晶包覆聚合物组成的共聚物制成的单层发光二极管
DOI：
10.1002/pola.22529
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发表时间：
2008-03
影响因子：
--
通讯作者：
Wang, Fuzhi
中科院分区：
文献类型：
--
作者：
Chuai, Yutao;Chai, Chunpeng;Zou, Dechun;Zhou, Qifeng;Wang, Ping;Chen, Xiaofang;Fan, Xinghe;Wang, Fuzhi
通过普通自由基聚合法合成了一系列PCT-co-Poly(N-乙烯基咔唑)共聚物，其中引入了P-Ct作为介元包裹的液晶聚合物，并研究了共聚物组成变化对聚合物光学性能的影响。用热重分析(TGA)、紫外光谱(UV)、光致发光(PL)、循环伏安(CV)和电致发光(EL)等方法对聚合物的结构和性能进行了表征和评价。所有聚合物都具有很高的热稳定性。随着N-乙烯基咔唑(NVK)含量的增加，薄膜中的PL峰较溶液中蓝移，荧光量子效率降低，支持了NVK单元向恶二唑单元的有效能量转移。循环伏安表明，随着NVK的加入，这些共聚物具有从-5.94 eV到-6.09 eV的高HOMO能级。制备了ITO/PEDOT/PCT-NVK/Mg：Ag/Ag结构的单层发光二极管，在450 nm和490 nm附近发出蓝光，最大亮度为703cd/m2。器件性能随NVK含量和器件配置的不同而不同，器件配置(B)和PCT-NVK8给出的外量子效率最佳值为0.27%。结果表明，通过适当的结构设计和器件结构的改变，可以在较高的外量子效率下显示出较强的蓝色电致发光。
A series of copolymers PCt-co-Poly(N-vinylcarbazole) were synthesized through common radical polymerization, in which P-Ct as a kind of mesogen-jacketed liquid crystalline polymer was introduced, and the effects of copolymers composing variation on the optical properties of the polymers were studied. The structures and properties of the copolymers were characterized and evaluated by thermogravimetric (TGA), UV, photoluminescence (PL), cyclic voltammetry (CV), and electroluminescence (EL) analyses. All the polymers enjoy high thermal stability. PL peaks in the film show blue-shift compared with in solutions and fluorescent quantum efficiency decreased with the N-vinylcarbazole (nvk) content increasing, which supported the efficient energy transfer from nvk units to the oxadiazole units. CV revealed that, with the incorporation of nvk to the copolymer, these copolymers had high-lying HOMO energy levels ranging from -5.94 to -6.09 eV. Single-layer light-emitting diodes (LEDs) with the configuration of ITO/PEDOT/PCt-nvk/Mg:Ag/Ag were fabricated, which emit a blue light around 450 and 490 nm with a maximum luminance of 703 cd/m 2 . The device performance varies with the content of nvk and device configuration, with device configuration (b) and PCt-nvk8 giving the best value of external quantum efficiency of 0.27%. We show here that by proper design copolymer structure and modification of device configuration can exhibit strong blue EL in higher external quantum efficiency.
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影响因子：
1.6
作者：
J. Kido;Gaku Harada;K. Nagai
通讯作者：
J. Kido;Gaku Harada;K. Nagai
影响因子：
15
作者：
Sung‐Ho Jin;Mock-Yeon Kim;J. Y. Kim;Kwanghee Lee;Y. Gal
通讯作者：
Sung‐Ho Jin;Mock-Yeon Kim;J. Y. Kim;Kwanghee Lee;Y. Gal
影响因子：
3.1
作者：
Chung‐Chih Wu;J. Sturm;R. Register;Jing Tian;Elena P. Dana;Mark E. Thompson
通讯作者：
Chung‐Chih Wu;J. Sturm;R. Register;Jing Tian;Elena P. Dana;Mark E. Thompson
影响因子：
29.4
作者：
Sung Tae Kim;D. Hwang;Xiao Chang Li;J. Grüner;R. Friend;A. Holmes;H. Shim
通讯作者：
Sung Tae Kim;D. Hwang;Xiao Chang Li;J. Grüner;R. Friend;A. Holmes;H. Shim
影响因子：
5.5
作者：
Chung-Wen Wu;Hong‐Cheu Lin
通讯作者：
Chung-Wen Wu;Hong‐Cheu Lin