期刊
DYES AND PIGMENTS
卷 112, 期 -, 页码 17-23出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2014.06.019
关键词
Two photon absorption; Azo dyes; Photo-switching; z-Scan; Phenylene; Fluorene
资金
- New Zealand Ministry for Business, Innovation and Employment [UOAX1202]
Here we describe the synthesis and characterization of a range of symmetric two photon absorbing chromophores containing photoswitchable Disperse Red-type donors. These have been incorporated into D-pi-D molecules with 1-(2-ethylhexyloxy)-4-methoxybenzene and 9,9-bis(2-ethylhexyl)-fluorene pi-cores, and D-pi-A-pi-D molecules based on a (2,6-dimethyl-pyran-4-ylidene)propanedinitrile acceptor core. The TPA cross section measured by z-scan at 780 nm was up to 298 GM for the D-pi-A-pi-D molecules and up to 1250 GM for the molecules with D Tc D architectures. As all of the compounds have azo groups as part of the pi linker the cis/trans isomerisation of these materials was also explored. It is found that dyes based on the D-pi-D architecture are more amenable to isomerisation and are also more stable in the cis form when compared to D-pi-A-pi-D chromophores. (C) 2014 Elsevier Ltd. All rights reserved.
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