Monodisperse Glassy-Nematic Conjugated Oligomers with Chemically Tunable Polarized Light Emission
Monodisperse Glassy-Nematic Conjugated Oligomers with Chemically Tunable Polarized Light Emission
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DOI：
10.1021/cm034579m
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发表时间：
2003-10
影响因子：
8.6
通讯作者：
Y. Geng;A. C. Chen;J. Ou;Shaw H. Chen;K. Klubek;K. Vaeth;C. Tang
中科院分区：
文献类型：
--
作者：
Y. Geng;A. C. Chen;J. Ou;Shaw H. Chen;K. Klubek;K. Vaeth;C. Tang
通过在蓝色荧光齐聚物中插入不同的链段，合成了一系列单分散的共轭齐聚物，以实现发光的全色域。量子力学计算表明，电子跃迁偶极子基本上平行于负责发光的中心段的长分子轴。用紫外-可见吸收二向色性测定了热处理玻璃膜中表征分子取向的取向序参量，其值为0.77 ~ 0.87。随着发射二色性比范围从9.4到13.7，偏振光致发光提供了进一步的证据，长分子轴与cnc的导演对齐。包含所选材料的偏振有机发光二极管（OLED）产生红色和黄色绿色光发射，二色性比分别为14.4和18.0，亮度产率分别为0.51和5.91 cd/A。这两组数据代表了红色和绿色偏振OLED迄今为止的最佳性能。
A novel series of monodisperse conjugated oligomers were synthesized by inserting varied segments into blue-emitting oligofluorenes to complete the color gamut of light emission. Quantum mechanical calculations revealed that the electron transition dipoles lie largely parallel to the long molecular axes of the central segments responsible for light emission. The orientational order parameter characterizing molecular alignment in thermally processed glassy-nematic films was evaluated at 0.77 to 0.87 by UV-vis absorption dichroism. With an emission dichroic ratio ranging from 9.4 to 13.7, polarized photoluminescence provided further evidence that the long molecular axes are aligned with the nematic director. Polarized organic light-emitting diodes (OLEDs) comprising selected materials resulted in red and yellowish green light emission with dichroic ratios of 14.4 and 18.0 and luminance yields of 0.51 and 5.91 cd/A, respectively. These two sets of data represent the best performance to date of red and green polarized OLEDs.