Hyperbranched Blue-Light-Emitting Alternating Copolymers of Tetrabromoarylmethane/Silane and 9,9-Dihexylfluorene-2,7-diboronic Acid
Hyperbranched Blue-Light-Emitting Alternating Copolymers of Tetrabromoarylmethane/Silane and 9,9-Dihexylfluorene-2,7-diboronic Acid
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DOI：
10.1021/ma0494030
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发表时间：
2004-06
期刊：
影响因子：
5.5
通讯作者：
Xueming Liu;Chaobin He;X. Hao;L. Tan;Yanqing Li;K. Ong
中科院分区：
文献类型：
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作者：
Xueming Liu;Chaobin He;X. Hao;L. Tan;Yanqing Li;K. Ong
以四溴芳基甲烷/硅烷为原料，与9，9-二己基芴-2，7-二硼酸在低浓度下进行Suzuki偶联缩聚反应，首次合成了可溶性超支化四面体聚合物。聚合物表现出高的热稳定性，其分解温度（Tds）在352 - 449 °C范围内。聚合物在溶液和固态下都能高效地发射蓝光。聚合物在THF溶液中的光致发光量子效率在73 - 99%范围内，在薄膜中的光致发光量子效率为38 - 82%。聚合物的薄膜PL光谱表现出与溶液中测定的光谱模式相似的光谱模式，观察到其发射最大值红移1 - 8 nm，半高宽（fwhm）值增加0 - 8 nm。在500 - 600 nm处没有观察到长波长的类准分子发射，这是聚芴的典型特征，因为它们在固态下会自聚集。因此，聚合物在溶胶中不易自聚集。
The first soluble hyperbranched tetrahedral polymers were prepared by Suzuki coupling polycondensation reaction between tetrabromoarylmethane/silane and 9,9-dihexylfluorene-2,7-diboronic acid at low concentrations. The polymers exhibited high thermal stability with their decomposition temperatures (Tds) in the range 352−449 °C. The polymers emitted blue light highly efficiently in both solution and the solid state. The photoluminescence quantum efficiencies of the polymers in THF solution were in the range 73−99%, and those in thin films were 38−82%. The film PL spectra of the polymers exhibited similar spectral patterns to those determined in solutions, with 1−8 nm red shift in their emission maxima and 0−8 nm increase in their full width at half-maximum (fwhm) values being observed. No long wavelength excimer-like emissions at 500−600 nm, which were typical for polyfluorenes due to their self-aggregation in the solid state, were observed. Thus, the polymers were less prone to self-aggregation in the sol...