BELHOUCIF, Rekia; VELÁZQUEZ, Matias; PLANTEVIN, Olivier; ASCHEHOUG, Patrick; GOLDNER, Philippe; GEORGE, C.

doi:10.1016/j.optmat.2017.09.026

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BELHOUCIF, Rekia
Laboratoire d'Electronique Quantique
Faculté des Sciences - Département de Physique

VELÁZQUEZ, Matias
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PLANTEVIN, Olivier
CSNSM PS2

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Optical Materials. 2017-11, vol. 73, p. 658-665

Elsevier

Résumé en anglais

A new borate solid solution series of powders, Li6Eu1-xSmx(BO3)3 (LSEBx, x = 0.35, 0.5, 0.6, 1), were synthesized by solid-state reaction, characterized and their luminescent properties were investigated. The absorption spectra indicate that absorption takes place mainly from the Sm3+6H5/2 ground state, with a strong band at 405 nm. The photoluminescence spectra reveal that the Eu3+ red emission intensity strongly depends on the Sm3+ content x. Judd-Ofelt theory was applied to experimental data for the quantitative determination of phenomenological parameters Ωi (i = 2, 4, 6) Judd Ofelt parameters, radiative transition rates and emission quantum efficiency. Owing to the energy transfer from Sm3+ to Eu3+ the intense red light detected at 613 nm at room temperature under UV or blue light excitation, was improved by ∼35% as compared with Sm3+-free samples. This energy transfer was confirmed by faster decay times of Sm3+ as energy donors. Moreover, the energy transfer between Sm3+ and Eu3+ is unidirectional and irreversible, implying that the energy transfer wastage between Sm3+ and Eu3+ is very low. Magnetic susceptibility (χ) measurements of LSEBx were carried out in the temperature range 2-320 K and are used to compare calculated and experimental energy levels.< Réduire

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Energy transfer

Activator

Sensitizer

Concentration quenching

Judd-Ofelt theory

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Optical spectroscopy and magnetic behaviour of Sm3+ and Eu3+ cations in Li6Eu1-xSmx(BO3)3 solid solution

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