Optical properties of pi-conjugated donor-acceptor systems with controlled hyperpolarizability

被引:0
|
作者
Piryatinski, Yu. P. [1 ]
Sevryukova, M. M. [1 ]
机构
[1] Natl Acad Sci Ukraine, Inst Phys, 46 Prospect Nauky, UA-03028 Kiev, Ukraine
关键词
J-aggregate; H-aggregate; up-conversion photoluminescence; two-photon excited photoluminescence; molecular exciton; charge-transfer exciton;
D O I
暂无
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
For supramolecular compounds with donor and acceptor fragments, coupled with each other by the pi-conjugated methyn chain, it was ascertained an influence of Cl and Br atoms on the pi-conjugation and charge transfer in them in molecular and aggregate states. Compound, which contains Br atom, crystallizes into a noncentrosymmetric polar structure and under infrared (1064 nm) laser excitation it is observed the second harmonic generation and intense up-conversion photoluminescence in the visible spectral region. For compounds containing Cl atom, when passing into a crystalline state, only up-conversion photoluminescence is observed, which can be considered as twophoton excited. Possible mechanisms of intramolecular charge transfer and collective interactions in investigated molecular structures under one-and two-photon excitation are considered.
引用
收藏
页码:292 / 302
页数:11
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