A Wide‐Bandgap Semiconducting Polymer for Ultraviolet and Blue Light Emitting Diodes
A Wide‐Bandgap Semiconducting Polymer for Ultraviolet and Blue Light Emitting Diodes
复制标题
DOI：
10.1002/macp.200300006
复制
发表时间：
2003-12
影响因子：
2.5
通讯作者：
P. Lu;Hai-quan Zhang;F. Shen;Bing Yang;Di Li;Yuguang Ma;Xinfang Chen;Jinghong Li;N. Tamai
中科院分区：
文献类型：
--
作者：
P. Lu;Hai-quan Zhang;F. Shen;Bing Yang;Di Li;Yuguang Ma;Xinfang Chen;Jinghong Li;N. Tamai
合成了一种新型宽带隙共轭聚合物(PDHFSCHD)，该聚合物由交替的二己基荧烷和刚性扭曲的联苯单元组成。这种由主链刚性扭曲链段组成的新型荧基共聚物具有高达3.26 eV的光学带隙和高效的紫外光发射，峰值位于368 nm和386 nm。通过对器件条件的优化，获得了峰值为395 nm、开启电压低于8V的电致发光器件，其峰值电致发光量子效率为0.054%，发光亮度为10cd.m(-2)。此外，在PDHFSCHD主体中掺入一种聚二己基荧烯，得到了417 nm和440 nm的纯蓝光发射，没有聚集物种的长波发射。在这些共混体系中，PDHFSCHD向PDHF的能量传递是有效的。PDHF在PDHFSCHD宿主体内的抑制链聚集可以对应于纯蓝色发射行为。
A novel wide-bandgap conjugated polymer (PDHFSCHD) consisting of alternating dihexylfluorene and rigidly twisted biphenyl units has been synthesized. The new fluorene-based copolymer composed of rigid twisting segments in the main-chain exhibits an optical bandgap of as high as 3.26 eV, and a highly efficient ultraviolet emission with peaks at 368 nm and 386 nm. An electroluminescence device from PDHFSCHD neat film as an active layer shows UV emission which peaks at 395 nm with a turn on voltage below 8 V By optimizing the device conditions, a peak EL quantum efficiency of 0.054% and brightness of 10 cd.m(-2) was obtained. Furthermore, blending a poly(dihexylfluorene) in the PDHFSCHD host gave pure blue emission peaking at 417 nm, and 440 nm without long wavelength emission from aggregated species. Efficient energy transfer from PDHFSCHD to PDHF was demonstrated in these blended systems. Depressed chain-aggregation of PDHF in the PDHFSCHD host can correspond to pure blue emission behaviors.