The development of poly(dendrimer)s for advanced processing
The development of poly(dendrimer)s for advanced processing
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DOI：
10.1039/c0py00039f
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发表时间：
2010-06
影响因子：
4.6
通讯作者：
Jack P. Gunning;J. W. Levell;M. F. Wyatt;P. Burn;J. Robertson;I. Samuel
中科院分区：
文献类型：
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作者：
Jack P. Gunning;J. W. Levell;M. F. Wyatt;P. Burn;J. Robertson;I. Samuel
合成了一种降冰片烯基均聚物，它的每个单体单元上都连接着一个树枝状的Ir(III)配合物。树枝状的Ir(III)配合物由三个面状排列的2-苯基吡啶配体组成。其中两个配体带有第一代联苯基树枝，表面连接有2-乙基己氧基，第三个配体通过苄氧基酯连接到聚合物主链上。该聚合物是在GRubbs III催化剂上开环歧化生成的，用MALDI-TOF质谱仪测定其熔点为130 kDa。在浓度为2 5 mg cm−3时，聚合物溶液的粘度为1.0 9 mPa.S，比含有相同体积重量的树枝状大分子的溶液高34%。树枝状大分子具有相同的核心、树枝和表面基团，但与聚合物不同，它的树枝连接到三个配体，而不是聚合物的两个。聚合物的溶液光致发光量子产率(PLQY)为57%，表明聚合物内部的生色团相互作用不会导致发光的强烈猝灭。然而，在固态时，PLQY显著下降，这表明聚合物生色团之间的相互作用是显著的。树枝的存在使得聚合物可以与4，4‘-双(N-咔唑基)-2，2’-联苯(CBP)简单共混，共混膜的PLQY为50%。在100cdm−2亮度下，具有混合发射层和电子注入传输层的简单双层器件的外量子效率为6.2%，表明多树枝状分子S是一类很有前途的有机电致发光材料。
A norbornenyl-based homopolymer that has a dendronised iridium(III) complex attached to every monomer unit has been synthesized. The dendronised iridium(III) complex is comprised of three facially arranged 2-phenylpyridyl ligands. Two of the ligands bear first generation biphenyl-based dendrons with 2-ethylhexyloxy surface groups attached and the third ligand is attached to the polymer backbone via a benzyloxy ester. The polymer was formed by ring opening metathesis using the Grubbs III catalyst and was found to have an Mp of 130 kDa by MALDI-TOF mass spectrometry. At a concentration of 25 mg cm−3 the polymer solution had a viscosity of 1.09 mPa s, which was 34% higher than a solution containing a dendrimer of same weight per volume. The dendrimer had the same core, dendrons, and surface groups but differed from the polymer in that it had dendrons attached to three of the ligands rather than the two of the polymer. The solution photoluminescence quantum yield (PLQY) of the poly(dendrimer) was found to be 57%, indicating that intra-polymer chromophore interactions were not leading to strong quenching of the luminescence. However, in the solid-state the PLQY dropped significantly, indicating that inter-polymer chromophore interactions were significant. The presence of the dendrons allowed the simple blending of the polymer with 4,4′-bis(N-carbazolyl)-2,2′-biphenyl (CBP), and the blended film had a PLQY of 50%. Simple bilayer devices with a blended emissive layer and an electron injection and transport layer had an external quantum efficiency of 6.2% at a brightness of 100 cd m−2, showing that poly(dendrimer)s are a promising class of OLED material.