Nonlinear absorption and photoluminescence emission in nanocomposite films of Fuchsine Basic dye–polymer system

• Published in: Chemical physics letters 2011-04, Vol.506 (1-3), p.61-65
• Main Authors: Sreekumar, G., Louie Frobel, P.G., Sreeja, S., Suresh, S.R., Mayadevi, S., Muneera, C.I., Suchand Sandeep, C.S., Philip, Reji, Mukharjee, Chandrachur
• Format: Article
• Language: English
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2011.02.048

[Display omitted] ►Organic-polymer nanocomposite films of excellent surface smoothness were fabricated. ► In the Z-scan experiment, a switchover from SA to TPA occurred near the focus. ► The organic-polymer nanocomposite films displayed intense PL emission at room temperature. Fuchsine Basic dye–polyvinyl alcohol composite films were fabricated and their structure, nonlinear absorption as well as linear absorption and photoluminescence properties were investigated. Switchover from saturable absorption to two-photon assisted excited state absorption with increase in intensity was observed in the open aperture Z-scan study (Nd:YAG, 532nm, 7ns). The effective two-photon absorption coefficient β was found to be several orders higher than that reported for rhodamine B. The dye–polymer films were characterized as nanocomposites with dye microdomains encapsulated between molecules of the amorphous polymer and having average surface roughness as low as ≈0.46nm. The samples also exhibited intense photoluminescence emission when excited with 534nm radiation.