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White light generation from HfO2 films co-doped with Eu3+ + Tb3+ ions synthesized by pulsed laser ablation technique

Aguilar-Castillo, A and Aguilar-Hernandez, J R and Garcia-Hipolito, M and Lopez-Romero, S and Swarnkar, R K and Baez-Rodriguez, A and Fragoso-Soriano, R J and Falcony, C (2017) White light generation from HfO2 films co-doped with Eu3+ + Tb3+ ions synthesized by pulsed laser ablation technique. In: CERAMICS INTERNATIONAL, 43 (1, A). pp. 355-362.

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Official URL: http://dx.doi.org/10.1016/j.ceramint.2016.09.163

Abstract

In this work we investigate the luminescent properties of HfO2 films doped with Eu-3*, Tb3+ and Eu3+ + Tb3+ ions excited through photoluminescence and cathodoluminescence. These films were synthesized by the pulsed laser ablation technique and structurally studied by X-ray diffraction and Raman spectroscopy; the surface morphology was observed by scanning electron and atomic force microscopies. The optical transmittance was measured as well. The crystalline phase observed was the monoclinic of the HfO2. The surface morphology of the films exhibited a low roughness, as measured by atomic force microscopy. These films show a high transparency in the visible region. The emission spectra show bands centered at 598, 614 (strongest emission), and 631 nm for the HfO2:Eu3+ films under excitation of 267.nm. HfO2:Tb3+ films when excited at 277 nm exhibit emission bands centered at 491, 543 (dominant emission), 551 and 586 nm. In the case of co-doping with Eu3+ and Tb3+ ions white emission was observed under excitation with 320 nm, as indicated by the CIE chromaticity diagram.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 31 Jan 2017 05:27
Last Modified: 31 Jan 2017 05:27
URI: http://eprints.iisc.ernet.in/id/eprint/56107

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