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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Widely dual tunable visible and near infrared emission in Pr3+-doped yttrium tantalate: Pr3+ concentration dependence on radiative transitions from P-3(0) to the D-1(2)

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Labaki, H. P. [1] ; Borges, F. H. [1] ; Caixeta, F. J. [1] ; Goncalves, R. R. [1]
Total Authors: 4
[1] Univ Sao Paulo, Dept Quim, FFCLRP, Lab Mat Luminescentes Micro & Nanoestruturados Ma, BR-14040901 Ribeirao Preto, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Luminescence; v. 236, AUG 2021.
Web of Science Citations: 1

A dual tunable visible (reddish, orangish, blueish and white emission) and near infrared energy conversion in Pr3+-doped yttrium tantalate prepared by sol-gel method were observed depending on the ratio of radiative transitions from the P-3(0) and D-1(2) excited states. The Pr3+ concentration influences the crystallization process of cubic Y3TaO7 and monoclinic M'-YTaO4 crystalline phases as attested by X-ray diffraction and Raman spectroscopy. Increasing the lanthanide concentration, the Y3TaO7 crystalline phase is stabilized, delaying the formation of the M'-YTaO4 one. Spectroscopic studies revealed a pronounced near-infrared (NIR) emission of Pr3+ ions, ascribed to D-1(2)-> F-3(3,4) transition, under ultraviolet (UV) and visible excitation. Changes in the emission profile were also noticed and could be correlated with the crystalline structure. A reduced multiphonon relaxation from the P-3(0) to the D-1(2) was observed due to the low phonon energy of the host. An intense blue emission (P-3(0)-> H-3(4)) was detected, which is increased in comparison to the red emission, for higher dopant concentration. Samples containing the highest Pr3+ concentration (5.0 mol %) exhibited a luminescence quenching on the visible and NIR transitions from the D-1(2) level indicating the influence of a cross-relaxation process on depopulating the D-1(2) level and tuning the color emission. All the above-mentioned structural and luminescent properties make these yttrium tantalates potential candidates for Photonic applications, especially as red-orangewhite-blue light emitters and as energy converters for the enhancement of commercial Si solar cell efficiency. (AU)

FAPESP's process: 20/05319-9 - Multifunctional plataforms based on lanthanide doped nanostructured luminescent materials for potential photonic and theranostic applications
Grantee:Rogéria Rocha Gonçalves
Support Opportunities: Regular Research Grants
FAPESP's process: 17/10423-7 - Broad band NIR emission from nanostructured Rare earth doped Nb2O5 and Ta2O5 derived materials for photonic applications as optical amplifiers and energy converters.
Grantee:Fábio José Caixeta
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 19/25991-6 - Study of upconversion processes in nanostructured materials based on rare earth doped GeO2-Ta2O5 with high emission quantum yield
Grantee:Fábio José Caixeta
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 18/04587-0 - Yttrium Tantalates and Niobates rare earth ions doped with emission in the visible and near infrared region for photonics applications
Grantee:Fernanda Hediger Borges Ribeiro
Support Opportunities: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 17/10424-3 - Luminescent rare earth tantalate and niobate: synthesis, properties and applications in photonics
Grantee:Fernanda Hediger Borges Ribeiro
Support Opportunities: Scholarships in Brazil - Master