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A molecular engineering strategy is developed around bis(di- n -methylamino)- E -stilbene 1 in order to design efficient two-photon absorbers in the visible range. This strategy is based on the role of the charge transfer conjugated system, and of donor substituents on theoretical linear and two-photon absorption (TPA). The best trade-off TPA-linear absorption is fulfilled by two tetraphephenyl-diamine derivatives (biphenyl and fluorene), which could allow, if mixed, efficient coverage of the visible range.
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Andraud et al. (2000) studied this question.
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