Journal
JOURNAL OF MATERIALS RESEARCH
Volume 36, Issue 14, Pages 2856-2871Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/s43578-021-00289-0
Keywords
Absorption; Optical properties; Luminescence; Polymer; X-ray diffraction
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Funding
- Science and Engineering Research Board (SERB), Department of Science and Technology (DST) Govt. of India [SR/FTP/PS-011/2010, SB/EMEQ-089/2013]
- UGC, New Delhi for SAP-CAS phase-II [F.530/9/CAS-II/2015(SAP-I)]
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The study investigated the optical properties of solvent cast brilliant green dye-doped poly(vinyl alcohol) composite films, including linear absorption spectra, fluorescence emission wavelength, and nonlinear optical properties. The results indicate that these composite materials have potential for optoelectronic and photonic applications.
The structural, linear, and nonlinear optical (NLO) characteristics of solvent cast brilliant green (BG) dye-doped poly(vinyl alcohol) (PVA) composite films were investigated. The composites show strong linear absorption spectra at 635 nm in the visible region. The fluorescence emission wavelength shifted from 665 to 678 nm and the fluorescence anisotropy (r) was estimated. The energy transfer mechanism was explained by fluorescence lifetime decay curves. NLO properties, such as nonlinear refractive index (n(2)), two-photon absorption (beta), and third-order nonlinear susceptibility chi((3)), were studied using Z-scan technique with He-Ne laser at 633 nm. The influence of dye doping switched the nonlinear absorption from reverse saturable to saturable absorption and the obtained beta, n(2), and chi((3)) are in the order of similar to 10(-3) cm W-1, 10(-8) cm(2) W-1, and 10(-6) esu, respectively, for all samples. The high fluorescence emission and NLO switching behavior show that the BG/PVA composites could be suitable for optoelectronic and photonic applications.
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