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Exceptionally Large Second‐Order Nonlinear Optical Response in Donor–Graphene Nanoribbon–Acceptor Systems
Author(s) -
Zhou ZhongJun,
Li XiaoPing,
Ma Fang,
Liu ZhenBo,
Li ZhiRu,
Huang XuRi,
Sun ChiaChung
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001727
Subject(s) - graphene , nonlinear optical , nonlinear system , order (exchange) , materials science , acceptor , optoelectronics , nanotechnology , physics , condensed matter physics , quantum mechanics , business , finance
Graphene nanoribbon (GNR) has been used, for the first time, as an excellent conjugated bridge in a donor–conjugated bridge–acceptor ( D –B–A) framework to design high‐performance second‐order nonlinear optical materials. Owing to the unique diradical planar conjugated bridge of GNR, D(NH 2 )–GNR–A(NO 2 ) exhibits exceptionally large static first hyperpolarizability ( β 0 ) up to 2.5×10 6 a.u. (22000×10 −30 esu) for H 2 N–(7,3)ZGNR–NO 2 (ZGNR=zigzag‐edged GNR), which is about 15 times larger than the recorded value of β 0 (1470×10 −30 esu) for the D–A polyene reported by Blanchard‐Desce et al. [ Chem. Eur. J. 1997 , 3 , 1091]. Interestingly, we have found that the size effect of GNR plays a key role in increasing β 0 for the H 2 N–GNR–NO 2 system, in which the width effect of GNR perpendicular to the D–A direction is superior to the length effect along the D–A direction.