Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.
Phys Chem Chem Phys. 2011 Oct 21;13(39):17825-30. doi: 10.1039/c1cp21848d. Epub 2011 Sep 6.
A new dendrimer using pyrene as core and carbazole derivative as dendron has been successfully prepared via Suzuki coupling reaction. Its chemical structure was confirmed through (1)H NMR, elemental analysis and MALDI-TOF MS methods. The dendrimer synthesized possessed excellent thermal stability with initial decomposition temperature over 470 °C and high fluorescence quantum yield of 86%. The luminescence spectra showed that, relative to the solution sample, the emission peaks of the solid dendrimer film were apparently broadened and red-shifted, indicating the strong π-π stacking effect between the pyrene moieties. By doping 1.5% of the dendrimer in 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), a light-emitting diode device was fabricated in the ITO/NPB/NPB:dendrimer (1.5%)/TPBI/Mg:Ag configuration, which emitted a white color with Commission Internationale de L'Eclairage (CIE(x,y)) coordinates of (0.29, 0.34) and a maximum brightness of 1300 cd m(-2), exhibiting promising potential in white light-emitting diode application.
一种以芘为核、咔唑衍生物为支化单元的新型树枝状聚合物通过 Suzuki 偶联反应成功制备。通过 1H NMR、元素分析和 MALDI-TOF MS 方法对其化学结构进行了确认。所合成的树枝状聚合物具有出色的热稳定性，初始分解温度超过 470°C，荧光量子产率高达 86%。荧光光谱表明，与溶液样品相比，固体树枝状聚合物薄膜的发射峰明显变宽且红移，表明芘部分之间存在强烈的π-π堆积效应。通过在 4,4'-双[N-(1-萘基)-N-苯基氨基]联苯（NPB）中掺杂 1.5%的树枝状聚合物，在 ITO/NPB/NPB:dendrimer（1.5%）/TPBI/Mg:Ag 配置下制备了一个发光二极管器件，其发射出的白光具有国际照明委员会（CIE(x,y)）坐标为（0.29，0.34）的颜色和 1300 cd m(-2)的最大亮度，在白光发光二极管应用中具有广阔的应用前景。
