Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437306 | Ceramics International | 2017 | 26 Pages |
Abstract
Trivalent dysprosium (Dy3+) ions -doped calcium silicate (Ca2SiO4) phosphors have been synthesized by utilizing agricultural waste of egg shell and rice husk through solid-state reaction method. The synthesized Ca2SiO4 powders thus obtained are crystallized in monoclinic structure with unit cell parameters of a = 5.53Â Ã
; b = 6.67Â Ã
; c = 9.13Â Ã
; β = 87.43° and irregular shape morphology. Luminescent properties of Dy3+:Ca2SiO4 phosphors were studied by varying active ion concentration. The phosphors emit characteristic blue and yellow emissions of Dy3+ ions corresponding to the 4F9/2 â 6H15/2 and 4F9/2 â 6H13/2 transitions, respectively. Color coordinates evaluated from emission spectra are found to fall in the white light region. Decay curves for the 4F9/2 level of Dy3+ ions exhibit single exponential nature and turn into non-exponential with shortening of lifetime from 739 µs to 510 µs when Dy3+ ion concentration is increased from 0.001 to 0.5 mol%. All these results confirm that Ca2SiO4:Dy3+ phosphors are suitable for the use as low cost white light emitting phosphors.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
L. Lakshmi Devi, Ch. Basavapoornima, V. Venkatramu, P. Babu, C.K. Jayasankar,