Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5397984 | Journal of Luminescence | 2017 | 46 Pages |
Abstract
A bright novel sensitized red emission has been obtained from functionalized multiwalled carbon nanotubes (f-MWCNTs) embedded Bi3++Eu3+: PVA polymer nanocomposites under UV excitation. We have successfully synthesized Eu3+: PVA, Bi3++Eu3+: PVA and Bi3++Eu3++ functionalized MWCNTs: PVA polymer films by traditional solution casting method. The structural and ion-polymer interaction studies have been analysed from XRD and FTIR spectral profiles. Eu3+ doped at different concentrations in PVA polymer films has displayed a red emission at 619Â nm (5D0â7F2) under 396Â nm (7F0â5L6) of excitation. Upon co-doping with Bi3+ ions in different concentrations to the Eu3+: PVA polymer film, it exhibits enriched red emission than single Eu3+: PVA under the same excitation due to energy migration from Bi3+ to Eu3+. Successful emission photons of Bi3+ ions are collectively absorbed by the Eu3+ ions which lead the improvement of red emission. In the same fashion, enriched red emission is observed from f-MWCNTs impregnated co-doped Bi3++Eu3+: PVA polymer composites. The red emission of Eu3+ is significantly enhanced in two ways through an efficient energy migration process from Bi3+ to Eu3+ and f-MWCNTs to Eu3+. Possible energy transfer mechanism is clearly demonstrated by several fluorescent methods. From these results, these f-MWCNTs embedded Bi3++Eu3+: PVA polymer films might be recommended as promising candidates for red luminescent materials for photonic devices.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
K. Naveen Kumar, R. Padma, L. Vijayalakshmi, Jeghan Shrine Maria Nithya, Misook Kang,