Dyes and Pigments p. 347 - 356 (2015)
Update date:2022-08-04
Topics:
Liu, Fenggang
Yang, Yuhui
Wang, Haoran
Liu, Jialei
Hu, Chaolei
Huo, Fuyang
Bo, Shuhui
Zhen, Zhen
Liu, Xinhou
Qiu, Ling
A series of second-order nonlinear optical chromophores containing an identical π-bridge and electron acceptor but different, aromatic amine electron-donating groups have been synthesized and systematically investigated. The donors studied here include traditional donors carbazole, triphenylamine and N,N-diethylaniline and novel donor phenothiazine, phenoxazine and N-(4-methoxyphenyl)phenoxazine. The ultraviolet absorption, solvatochromic, redox properties, density functional theory calculations, thermal stabilities and electro-optic activities of these chromophores were systematically studied to compare the strength of the donors and illustrate the structure-performance relationships within six chromophores. The results show that the new donors have stronger electron-donating ability than traditional donors. Moreover, they show reduced energy gap, much larger molecular quadratic hyperpolarizability (μβ) and r33 value. Exemplified by the N-(4-methoxyphenyl)phenoxazine chromophore, it showed nearly three times higher μβ and more than four times higher r33 value than that of the N-hexylcarbazole containing chromophore.
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