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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。即使对于向列相，在有机发光二极管（OLED）所用的强电场下，也避免了Fredericks跃迁。具有较高的最高占据分子轨道（HOMO）水平的液晶材料由于其较高的空穴注入概率而被发射。每种颜色（R，G，B）包含三种荧光染料的LC材料显示出相应的颜色发射。但是，只有蓝色染料显示出非常小的发光。相对荧光量子产率的测量揭示了所有染料的相似荧光效率。仅蓝色染料的HOMO能级与基质LC非常接近。这个事实可能导致蓝色染料分子的空穴捕获概率非常小。建议在使用本文研究的LC材料的OLED系统中，电子和捕获在染料分子上的空穴的复合对于发光而不是Foerster能量转移起主导作用。

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