کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10128427 | 1645135 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
D-Ï-A type conjugated pyrene derivatives: Third-order nonlinear absorption and excited-state dynamics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Two novel conjugated pyrene derivatives (C1 and C2) with D-Ï-A structures were synthesized to realize broadband reverse saturable absorption (RSA) under femtosecond laser excitation (ranging from 515 to 700Â nm) resulting from two-photon absorption (TPA) and TPA-induced excited-state absorption. Furthermore, these two derivatives showed RSA on the picosecond and nanosecond time regions (532Â nm). Quantum chemical calculations indicated that two mechanisms for the HOMO-LUMO excitation of the two molecules exist simultaneously: intramolecular charge transfer (which is considered to trigger the nonlinear optical response) and Ï-Ï* transition. It was found that the Ï-Ï* transition localized in the pyrene group can contribute to the increase in the nonlinear absorption of pyrene derivatives. Femtosecond time-resolved transient absorption spectrum provided information on the dynamics of the locally excited singlet state (1LE) and the charge-transfer state (1CT) for both compounds. The results show that these pyrene derivatives are promising candidates for future optoelectronic and RSA applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 85, November 2018, Pages 319-328
Journal: Optical Materials - Volume 85, November 2018, Pages 319-328
نویسندگان
Ruipeng Niu, Qing Chang, Xingzhi Wu, Yanbing Han, Jidong Jia, Shuang Chen, Yinglin Song,