Journal article
Luminescent coatings from bipyridine-based bridged silsesquioxanes containing Eu 3+ and Tb 3+ salts
Journal of Materials Chemistry, Vol.22(26), pp.13279-13285
2012
Abstract
The sol-gel fabrication of bridged silsesquioxane thin films containing trivalent lanthanide ions (Ln3+) has been achieved from a 4,4′-diureido-2,2′-bipyridine bridged organosilane (P4) in the presence of Eu3+ or Tb3+ salts. Crack- and defect-free thin films (50 nm) of optical quality were successfully deposited on glass substrates by spin-coating after optimizing the spinning rate and solvent system. Ellipsometry investigations revealed a significant decrease in the refractive index of the films with ageing of the corresponding precursor sols. In contrast, the photoluminescence properties of the films are independent of precursor ageing time, although significant differences are observed with respect to the corresponding bulk materials. Compared to the bulk materials, the films exhibit a significant blue-shift of the excitation spectra and an increase of the excited state lifetime. The optical conversion efficiencies (ηopt) of the F4-Eu and F4-Tb-based collectors were also determined and potential applications of the coatings in such areas as luminescent solar concentrators are discussed.
Details
- Title
- Luminescent coatings from bipyridine-based bridged silsesquioxanes containing Eu 3+ and Tb 3+ salts
- Authors
- J Graffion (Author) - Institut Charles Gerhardt Montpellier, FranceAna M Cojocariu (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringX Cattoen (Author) - Institut Charles Gerhardt Montpellier, FranceR A S Ferreira (Author) - Universidade de Aveiro, PortugalV R Fernandes (Author) - Universidade de Aveiro, PortugalP S Andre (Author) - Universidade de Aveiro, PortugalL D Carlos (Author) - Universidade de Aveiro, PortugalM Wong Chi Man (Author) - Institut Charles Gerhardt Montpellier, FranceJohn R Bartlett (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
- Publication details
- Journal of Materials Chemistry, Vol.22(26), pp.13279-13285
- Publisher
- Royal Society of Chemistry (R S C) Publications
- Date published
- 2012
- DOI
- 10.1039/C2JM31289A
- ISSN
- 0959-9428
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450026402621
- Output Type
- Journal article
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