有机分子的共轭体系长度对双光子吸收性质的影响

The Effect of Conjugated Length of System on the TPA Properties for Organic Molecules

影响分子的双光子吸收性质的因素很多,其中共轭体系的长度是一个关键因素.以二苯乙烯类有机分子为例,增加苯乙烯基的数目(n)以增加共轭链的长度设计了一系列分子,用zindo/sos方法计算得到分子的双光子吸收截面,结果表明分子的最大双光子吸收截面并不是随着n的增大无限增大而是具有饱和性,当n>10之后分子的双光子吸收截面的增加趋于平缓.

Many factors are responsible for the increase of TPA cross section for organic molecules. The conjugated length has important influence on the TPA properties. The TPA cross sections of stilbene derivatives which is composed of n (n= number of styryl group) styryl groups are calculated by ZINDO/SOS method. The results indicates that the TPA cross section can increase with the increasing chain length but it increase slowly when n>10.