Contribution of excited state absorption to optical limiting properties in multi-branched structures

[Display omitted] •Multi-branched compounds D1–D3 were investigated. D3 showed the best thermal and photochemical stability, and optical limiting potential.•Introducing a three-branched structure has much stronger impact on the ESA of D3 than on its linear absorption compared with the monomer D1.•Th...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2018-03, Vol.355, p.226-232
Main Authors: Wang, Liuheng, Wu, Yishi, Zhao, Yuxia
Format: Article
Language:English
Subjects:
1064 nm laser
Absorption
Absorption spectra
Chemical compounds
Constraining
Femtosecond pulses
Lasers
Malononitrile
Nanosecond pulses
Nonlinear absorption
Optical properties
Photochemical stability
Photochemicals
Photochemistry
Photon absorption
Pulsed lasers
Thermal stability
Triphenylamine
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Summary:[Display omitted] •Multi-branched compounds D1–D3 were investigated. D3 showed the best thermal and photochemical stability, and optical limiting potential.•Introducing a three-branched structure has much stronger impact on the ESA of D3 than on its linear absorption compared with the monomer D1.•The difference among ESA contributions of D1–D3 was the main reason to their appeared enhancements of effective 2PA in nanosecond regime. A series of multi-branched compounds D1–D3 combining a triphenylamine core with one, two or three benzylidene cyclopentylidene malononitrile branches, respectively, were synthesized. The linear photophysical property, photochemical stability, thermal stability, and nonlinear absorption under 1064nm pulsed lasers with pulse durations in both nanosecond and femtosecond regimes of D1–D3 were investigated. The results showed that the main optical limiting mechanism of D1–D3 under femtosecond pulses was two-photon absorption (2PA), but their excited state absorption (ESA) became the main contributor for their optical limiting behaviors under nanosecond pulses. Meanwhile, introducing a multi-branched structure has much stronger impact on the ESA spectrum of D3 than on its linear absorption spectrum compared with the monomer D1. The largest ESA cross-section of D3 was the main contributor to its enhancement of effective 2PA in nanosecond regime. Combining with its best thermal and photochemical stability, the three-branched compound D3 was proved as a good optical limiting material for 1064nm nanosecond pulsed lasers.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2017.09.026