Loading…

Silver (Ag) nanoparticles enhanced luminescence properties of Dy3+ ions in borotellurite glasses for white light applications

In the present work, the structural and optical properties of borotellurite glasses co-doped with Dy3+ ions and Ag nanoparticles were investigated. From HR-TEM analysis, the average Ag nanoparticle diameter was calculated as 13.7 ± 1 nm. The negative sign of the bonding parameter explored the ionic...

Full description

Saved in:
Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2018-11, Vol.204, p.537-547
Main Authors: Vijayakumar, R., Nagaraj, R., Suthanthirakumar, P., Karthikeyan, P., Marimuthu, K.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the present work, the structural and optical properties of borotellurite glasses co-doped with Dy3+ ions and Ag nanoparticles were investigated. From HR-TEM analysis, the average Ag nanoparticle diameter was calculated as 13.7 ± 1 nm. The negative sign of the bonding parameter explored the ionic nature of metal-ligand (DyO) bonds. The emission spectra exhibited three emission bands in blue, yellow and red regions corresponding to 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 transitions, respectively. The Yellow/Blue (Y/B) ratio of optimal BTD0.5A glass was found to be 1.881 and this low Y/B ratio indicated the fact that Dy3+ ions were located in higher symmetrical ligand environment. The CCT values are found to vary from 3717 to 3800 K and hence the present glasses may emit cool white light when excited with UV lamp. The radiative parameters were calculated for all the emission transitions by using JO theory. The decay curves are found to show non-exponential behavior for all the studied glasses. The obtained results were discussed in detail and compared with similar reported glasses. [Display omitted] •Lower Ω2 values show the higher symmetrical ligand field around Dy3+ ions & less covalent DyO bonds.•Small black spots in TEM images confirm the presence of Ag NPs.•BTD0.5A glass exhibit maximum enhancement due to the energy transfer from Ag NPs to the Dy3+ ions.•CIE analysis reveals the fact that present glasses can emit cool white light under UV excitation•4F9/2 → 6H13/2 transition of BTD0.5A glass has higher A, σpE &σpE × τexp values suitable for lasers.
ISSN:1386-1425
DOI:10.1016/j.saa.2018.06.092