D-π-A-π-D型萘基衍生物的电子、光谱和电荷传输性质

Electronic, Optical and Charge Transport Properties of D-π-A-π-D Type Naphthalene-Based Derivatives

采用量子化学方法研究了给体-π桥-受体-π桥-给体(D-π-A-π-D)型萘基衍生物及其"CH"/N杂原子取代衍生物的电子、光谱和电荷传输性质.计算结果表明,分子结构的变化引起了电子结构和能隙的变化,进而改变了吸收和发射光谱.其中,衍生物的最大发射波长几乎覆盖了可见光区域(447.7-743.1nm).而且,光谱的Stokes位移较大(106.1-222.4nm),产生的原因在于,与基态结构相比较,衍生物的激发态结构中分子主干存在两个相连部分更为平面的构型.计算结果还显示,所有衍生物都可以作为有机电致发光二极管中的空穴传输材料.

A luminescent donor-π-bridge-acceptor-π-bridge-donor （D-π-A-π-D） type naphthalene-based derivative and its ＂CH＂/IN substituted derivatives have been designed and their electronic, optical, and charge transport properties were investigated using quantum chemical approaches. Our calculations have shown that changes in molecular structure lead to modifications in the electronic structure, resulting in a modulation of the electronic bandgap and hence of the optical properties. Remarkably, the calculated emission spectra can nearly cover the full UV-Vis spectrum （from 447.7 to 743.1 nm）. Also, large Stokes shifts were observed, ranging from 106.1 to 222.4 nm, resulting from a more planar conformation of the excited state between the two adjacent units in the molecular backbone relative to the ground state. Calculated results also showed that the designed compounds could be used as hole transport materials in organic light-emitting diodes.