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Photoluminescence developed from polystyrene and CdS/polystyrene nanocomposite films in picosecond time range by repetitional irradiation of excitation femtosecond pulses in PL up conversion measurements

Paper ID Volume ID Publish Year Pages File Format Full-Text
27589 44031 2010 8 PDF Available
Title
Photoluminescence developed from polystyrene and CdS/polystyrene nanocomposite films in picosecond time range by repetitional irradiation of excitation femtosecond pulses in PL up conversion measurements
Abstract

A CdS/SPS nanocomposite film in which CdS nanoparticles were embedded into partially sulfonated polystyrene (SPS) was synthesized and its subpicosecond time resolved photoluminescence (photoluminescence up conversion: PL Up-C) measurements were carried out. A similar measurement was also done for pure SPS and polystyrene (PS) films that were used as the matrix. For a CdS/SPS, PL Up-C signals (sum frequency signal; SFS) were observed at the first measurement. They were also observed for pure SPS and PS films by repetitional measurements though they were not observed at the first measurement. It seems that the development of SFS for SPS and PS films is due to relatively stable luminescent substances formed from themselves by exposing them to intense femtosecond laser pulse (for excitation) during the measurements. The SFS development process was also readily observed for a CdS/SPS film by reducing excitation pulse intensity in the measurements. Therefore, PL that was observed for a CdS/SPS film is also mainly due to luminescent substances formed from the SPS matrix but CdS nanoparticles. CdS nanoparticles embedded into a SPS film may act as an accelerator for PL development from the SPS matrix. The origin of PL may be several luminescent substances formed by photo- or thermal-degradation of SPS via multiphoton (probably two photons) absorption of SPS itself and/or photo-excitation of CdS nanoparticles. Although the luminescent substances could not be assigned, they might be oxidative decomposition products of SPS that have long conjugated π bonds with a PS main polymer chain that absorbs the excitation femtosecond pulse (λmax = 396 nm).

Keywords
Polystyrene; CdS nanoparticle; Photoluminescence; Multiphoton absorption; Degradation; Femtosecond laser excitation
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Photoluminescence developed from polystyrene and CdS/polystyrene nanocomposite films in picosecond time range by repetitional irradiation of excitation femtosecond pulses in PL up conversion measurements
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 213, Issues 2–3, 25 June 2010, Pages 93–100
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us