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Light-emitting materials based on liquid crystals

机译：基于液晶的发光材料

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Liquid crystal (LC) materials with negative dielectric anisotropy have been successfully applied to light emitting diode. Even for a nematic phase, the Fredericks transition was avoided under such a strong electric field as used in organic light emitting diode (OLED). The LC materials having shallower highest occupied molecular orbital (HOMO) levels have been emissive due to their higher probability for hole injection. The LC materials incorporated three fluorescent dyes for each color (R,G,B) show corresponding color emission. However, only blue dye shows extraordinarily small light emission. Relative fluorescence quantum yield measurement reveals similar fluorescence efficiency for all dyes. Only blue dye's HOMO level lies very close to that of the matrix LC. This fact may lead to very small hole trapping probability for the blue dye molecule. It is suggested that in the OLED system using LC materials studied here, the recombination of the electrons and the holes trapped at the dye molecules is dominant for light emission rather than Foerster energy transfer.
机译：具有负介电各向异性的液晶（LC）材料已成功应用于发光二极管。即使对于向列阶段而言，在有机发光二极管（OLED）中使用的这种强电场避免了握手过渡。由于其孔注射较高的概率，具有较浅的分子轨道（HOMO）水平的LC材料具有发光性。 LC材料掺入每种颜色的三种荧光染料（R，G，B）显示相应的颜色发射。然而，只有蓝色染料显示出极其小的发光。相对荧光量子产率测量显示所有染料的类似荧光效率。只有蓝色染料的同性恋水平非常接近矩阵LC的同性恋。这一事实可能导致蓝色染料分子的非常小的孔捕获概率。建议在使用这里研究的LC材料的OLED系统中，电子和捕获在染料分子的孔的重组是发光而不是Foerster能量转移的主导。

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