Physical and optical studies of Gd 2 O 2 S:Eu 3+ nanophosphors by microwave irradiation and γ-irradiation methods.

Autor: Rahim S; Nuclear Technology Research Centre, Faculty Science and Technology, University of Kebangsaan Malaysia (UKM), Bangi, Selangor, Malaysia., Ayob MTM; Nuclear Technology Research Centre, Faculty Science and Technology, University of Kebangsaan Malaysia (UKM), Bangi, Selangor, Malaysia., Hasim MH; Nuclear Technology Research Centre, Faculty Science and Technology, University of Kebangsaan Malaysia (UKM), Bangi, Selangor, Malaysia., Abdul Rahman I; Nuclear Technology Research Centre, Faculty Science and Technology, University of Kebangsaan Malaysia (UKM), Bangi, Selangor, Malaysia., Radiman S; Nuclear Technology Research Centre, Faculty Science and Technology, University of Kebangsaan Malaysia (UKM), Bangi, Selangor, Malaysia.
Jazyk: angličtina
Zdroj: Luminescence : the journal of biological and chemical luminescence [Luminescence] 2019 Nov; Vol. 34 (7), pp. 699-706. Date of Electronic Publication: 2019 Jul 11.
DOI: 10.1002/bio.3655
Abstrakt: Gd 2 O 2 S:Eu 3+ nanophosphors have been successfully synthesized using microwave irradiation and γ-irradiation methods with polyvinyl pyrrolidone as a stabilizer. The physical and luminescence spectra were compared. The morphologies of both Gd 2 O 2 S:Eu 3+ nanophosphors were in the hexagonal phase and mainly consisted of spherical nanostructures with diameters of ~90 nm and ~50 nm for both microwave irradiation and γ-irradiation methods. Upon 325 nm of ultraviolet (UV) light excitation, strong red emissions (626 nm) were observed for both methods; these emissions corresponded to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. However, Gd 2 O 2 S:Eu 3+ nanophosphors following microwave treatment showed better luminescence intensity than Gd 2 O 2 S:Eu 3+ nanophosphors treated with γ-irradiation. This difference was attributed to the crystallinity phase and surface quenching effects of Gd 2 O 2 S:Eu 3+ nanophosphors. The reaction mechanisms of Gd 2 O 2 S:Eu 3+ nanophosphors in both methods are discussed in detail.
(© 2019 John Wiley & Sons, Ltd.)
Databáze: MEDLINE
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