1,5-二苯基-3-联苯基-2-吡唑啉的荧光光谱行为研究

Study on Fluorescence Spectral Behavior of 1,5-Diphenyl-3-biphenylyl-2-pyrazoline

吡唑啉衍生物具有优异的空穴传输性能和光致发光性能。本文采用荧光光谱法研究了化合物1,5-二苯基-3-联苯基-2-吡唑啉(DBP)的荧光光谱行为。DBP有较强的荧光发射,其光谱行为受溶剂极性和酸度影响显著。随着溶剂极性增加,DBP的荧光发射峰明显红移,其激发态与基态的偶极矩差值增大,发生了分子内电荷转移。在强酸性条件下,DBP的荧光被显著猝灭,量子产率降低。另外,受体分子芴酮或三硝基芴酮能有效猝灭DBP的荧光,其猝灭机理为动态猝灭,两者发生了较强的分子间光诱导电荷转移。DBP与三硝基芴酮间的电荷转移作用明显大于芴酮。

The pyrazoline derivatives have excellent hole-transfer performance and luminescent properties.In this paper,the spectral behaviors of 1,5-diphenyl-3-biphenylyl-2-pyrazoline（DBP）were investigated by fluorescence spectroscopy briefly.DBP has strong fluorescence emission,and its spectral behaviors were significantly affected by solvent polarity and acidity.With the increase of solvent polarity,the fluorescence emission of DBP showed a remarkably red shift,and the difference of dipole moments between the excited state and the ground state increased due to intramolecular charge transfer.Under strong acidic conditions,the fluorescence of DBP was significantly quenched and quantum yield reduced.In addition,the fluorescence of DBP were effectively quenched by acceptors of fluorenone and trinitrofluorenone,because of strong intermolecular photoinduced charge transfer.The charge transfer between DBP and trinitrofluorenone was obviously stronger than fluorenone.Further experiment shows that the fluorescence quenching of DBP by fluorenone or trinitrofluorenone was dynamic quenching process.