Ultrafast photophysical and nonlinear optical properties of novel free base and axially substituted phosphorus (V) corroles

Katturi, Naga Krishnakanth and Balahoju, Shivaprasad Achary and Ramya, A.R. and Biswas, Chinmoy and Raavi, Sai Santosh Kumar and Giribabu, Lingamallu and Soma, Venugopal Rao (2020) Ultrafast photophysical and nonlinear optical properties of novel free base and axially substituted phosphorus (V) corroles. Journal of Molecular Liquids, 311. p. 113308. ISSN 01677322

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The progression in synthetic procedures over the last two decades gave admittance to a wide variety of corroles for suitable potential applications such as photovoltaics, photonics, and bio-imaging. In this communication, we present results from our investigations of ultrafast photophysical processes and third-order nonlinear optical properties of newly synthesized donor-acceptor based free-base [(C6F5)3] and phosphorus [P-(OH)2(C6F5)3] corroles. The global analysis of the femtosecond transient absorption data based on the compartmental model revealed the corresponding time constants of several photophysical processes such as (a) internal conversion (τIC) in the 260–280 fs range (b) vibrational relaxation (τVR) in the 2.5-5 ps range and (c) nonradiative relaxation times (τnr) in the 4.15–7.6 ns range and finally (d) triplet lifetimes in the range of 25–50 μs. The two-photon absorption (TPA) cross-section measurements were performed using the femtosecond, kHz pulse Z-Scan technique at 600 nm and 800 nm and the retrieved TPA cross-section values were in the range of ~102 GM. Degenerate four-wave mixing measurements illustrated a large third-order nonlinear optical susceptibility χ(3) with a magnitude of 6.9 × 10−14 esu and instantaneous (sub-picosecond) response, suggesting a pure electronic contribution to the nonlinearity of these corroles. The discoveries from this study may help further to extend the capability of corroles as NLO materials for photonic applications.

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IITH Creators:
IITH CreatorsORCiD
Biswas, ChinmoyUNSPECIFIED
Raavi, Sai Santosh Kumarhttp://orcid.org/0000-0002-2496-9233
Item Type: Article
Uncontrolled Keywords: Cross-section measurement; Degenerate four wave mixing; Electronic contributions; Femtosecond transient absorption; Non-linear optical properties; Non-radiative relaxation; Third order nonlinear optical properties; Third order nonlinear optical susceptibility
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 07 Jul 2021 06:59
Last Modified: 07 Jul 2021 06:59
URI: http://raiith.iith.ac.in/id/eprint/8158
Publisher URL: http://doi.org/10.1016/j.molliq.2020.113308
OA policy: https://v2.sherpa.ac.uk/id/publication/14013
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