Linear and nonlinear optical properties of two novel D–π–A–π–D type conjugated oligomers with different donors

• Published in: Optical materials Vol. 35; no. 3; pp. 467 - 471
• Main Authors: Huang, Tian-Hao, Yang, Dan, Kang, Zhi-Hui, Miao, Er-Long, Lu, Ran, Zhou, Hui-Peng, Wang, Fei, Wang, Gao-Wen, Cheng, Peng-Fei, Wang, Ying-Hui, Zhang, Han-Zhuang
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 01.01.2013; Elsevier
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); Linear conjugated oligomer; Nonlinear optics; Optical materials; Optical susceptibility, hyperpolarizability; Optics; Physics; Polymers and organics; Two-photon absorption; z-Scan; z-Scan; Two-photon absorption; Linear conjugated oligomer; Fluorene; Molecular structure; Fluorescence; Chromophores; Excited states; Pi electron system; Z scan; Oligomers; Lifetime; Electronic structure; Optical properties; Optical materials; Two photon absorption; Conjugated compound; Nonlinear optics; Donor acceptor interaction
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2012.09.032

[Display omitted] ► Donor-dependent optical properties of novel fluorenone-based oligomers are studied. ► Triphenylamine donor red-shifts the steady-state spectra compared to fluorene. ► Compared to fluorene donor, triphenylamine could increase the TPF efficiency. ► Triphenylamine donor could enhance the TPA cross-section compared to fluorene. ► Electronic structure and properties were learned by quantum chemical calculations. Experimental and theoretical studies on the donor-dependent optical characteristics of two D–π–A–π–D type linear fluorenone-based conjugated oligomers are presented, where fluorene and triphenylamine act as the donors, respectively. Because of the strong electron-donating ability, the triphenylamine chromophores lead to red-shifts of spectral features, shorten the excited state lifetime, and enhance the two-photon fluorescence efficiency and two-photon absorption cross-section in comparison with fluorene groups. Quantum chemical calculations provide complementary information regarding the molecular structures and the frontier orbitals, which can provide a deep insight into the electronic structure and properties of oligomers.