氰基功能化位阻型螺芴类有机半导体的合成及其光电特性与存储器

发布时间：2018-02-26 00:00

本文关键词： 螺环芳烃氰基功能化延迟荧光激基复合物晶体管存储器偶极矩效应空间位阻　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,由于螺环芳烃具有特殊的十字交叉型空间位阻结构、电子结构易于调控及形貌稳定性好等特点,已经被广泛应用于有机电致发光、有机太阳能电池、有机激光和有机电存储等相关领域。在本文中,我们通过对螺芴类有机半导体进行不同反应活性位点的功能化,以研究材料的分子结构与器件性能之间的构效关系。首先,我们以本组早期开发的“一锅法”制备出的螺芴氧杂蒽衍生物为构筑单元,设计并合成了一系列氰基取代的螺芴分子,并对其电化学性质、电子结构以及激基复合物形成进行了系统研究。研究发现对称氰基取代的螺环芳烃能够与适当的给体材料形成激基复合物,并实现长寿命、高荧光量子效率的延迟荧光,有效地提高了基于螺芴氧杂蒽分子的荧光器件效率。随后,我们对氰基取代螺芴氧杂蒽分子的二面角、静电势分布、偶极矩进行分析,发现具有对称结构的螺芴氧杂蒽分子具有较小的偶极矩。将氰基取代螺芴氧杂蒽类衍生物作为有机电荷存储单元引入晶体管存储器,通过对比器件存储窗口、存储密度以及电荷捕获速率的大小,研究了由氰基吸电子特性引起的偶极矩效应对螺环芳烃空穴存储能力的影响,发现具有小偶极矩的螺芴氧杂蒽分子具有更强的空穴捕获能力。并且,通过加以光辅助的方式,实现了电写入、光擦除的非易失性晶体管存储器。最后,通过对比具有更大空间位阻的螺芴苯并氧杂蒽的电子结构、静电势分布以及偶极矩大小,发现具有更大π共轭平面的螺芴苯并氧杂蒽分子偶极矩更小。为了进一步验证偶极矩和空间位阻效应对螺环分子空穴存储能力的影响,我们将其继续引入晶体管存储器,发现具有更大空间位阻结构与小偶极矩的螺环芳烃能够形成更多的空穴捕获单元,有利于实现高密度电存储器件。
[Abstract]:In recent years, due to spiro aromatics has cross space special steric structure, electronic structure, easy to control and shape stability, has been widely used in organic electroluminescence, organic solar cells, organic laser and electrical storage and other related fields. In this paper, we carried through the function of different reaction the active site of spirofluorene derivatives of organic semiconductors, the relationship between molecular structure and properties of device materials. First of all, we in the group of the early development of the "one pot" prepared spirofluorene xanthene derivatives as the construction units, design and synthesis of a series of cyano substituted spirofluorene molecule, and its electrochemical properties, electronic structure and exciplex formation were studied. The research shows that the symmetry of cyano substituted spiro aromatic with appropriate donor materials, the formation of exciplex, And realize the long life, delayed fluorescence of high fluorescence quantum efficiency, effectively improve the efficiency of fluorescent devices spirofluorene xanthene molecules based on. Then, we replace the dihedral spirofluorene xanthene molecule 4-cyanol, electrostatic potential, dipole moment analysis, found that the dipole moment with symmetric spirofluorene ofoxa anthracene molecules have smaller. The cyano substituted spirofluorene xanthene derivatives as organic charge storage unit into the transistor memory, through the comparison of the storage devices window, storage density and charge trapping rate, to study the influence caused by the electron withdrawing cyano characteristics of dipole moment effect to the spiro arene storage capacity, has found the small dipole moment of spirofluorene xanthene molecules have a stronger hole capture ability. And, through to light assisted way, realized the written optical erasure of nonvolatile memory transistor . finally, the electronic structure by comparing with larger steric spirofluorene benzo xanthene, electrostatic potential and dipole moment size, found to have larger conjugated plane spirofluorene xanthene benzene and the molecular dipole moment is smaller. In order to verify the effect of dipole moment and the steric effect of the ring the capacity of the screw hole, we will continue to introduce a transistor memory, that has more spiro aromatic steric structure and small dipole moment can form more hole capture unit, is conducive to the realization of high density storage devices.

【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN304

【相似文献】