Enhancement of electro-optic activity by introduction of a benzyloxy group to conventional donor-π-acceptor molecules

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• 作者：Xianqing Piao^a ; Xianming Zhang^a ; ^d ; Shinichiro Inoue^a ; ^b ; Shiyoshi Yokoyama^a ; ^{s_yokoyama@cm.kyushu-u.ac.jp"" rel=""nofollow} ; Isao Aoki^b ; Hideki Miki^b ; Akira Otomo^b ; Hidehisa Tazawa^c
• 关键词：Electro-optic ; Nonlinear optics ; Chromophore ; Poling ; FTC ; Donor
• 刊名：Organic Electronics
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：12
• 期：6
• 页码：1093-1097
• 全文大小：588 K

文摘

In this work, we investigated the enhancement of the electro-optic response by introducing benzyloxy group as an additional donor part on conventional donor-π-acceptor molecules. This new type donor exhibited a strong solvatochromic effect, indicating an extra donation to the π-conjugated bridge, which shifted the charge-transfer absorption of the chromophores to the lower energy region. Furthermore, the simple modification on the donor moiety resulted in about 2-fold improvement in the first hyperpolarizability and macroscopic electro-optic coefficient (r₃₃) over the benchmark 2-dicyanomethylen-3-cyano-4-{2-[E-(4-N,N-di(2-acetoxyethyl)-amino)-phenylene-(3,4-dibutyl)thien-5]-E-vinyl}-5,5-dimethyl-2,5-dihydrofuran (FTC) counterparts. An r₃₃ above 100 pm/V is ultimately achieved in conventional guest–host system.