Optical properties of 2 at %(Ln3+) doped LiGd(WO4)2 with Ln; Eu, Er and Tm, grown by μ-pulling down technique - Archive ouverte HAL Access content directly
Journal Articles Journal of Alloys and Compounds Year : 2020

Optical properties of 2 at %(Ln3+) doped LiGd(WO4)2 with Ln; Eu, Er and Tm, grown by μ-pulling down technique

B. Rekik
  • Function : Author
G. Alombert-Goget
  • Function : Author
  • PersonId : 901772
O. Benamara
  • Function : Author
K. Lebbou

Abstract

Spectroscopic and luminescent properties of europium (Eu), erbium (Er), thulium (Tm) doped LiGd(WO4)2 fibers crystals, present high performances for investigation in phosphorus and laser applications. We have successfully grown 2 at % Eu, Er and Tm-doped LiGd(WO4)2 singles-crystals fibers by the Micro Pulling Down (μ-PD) technique (melting point above 1115 °C) using a pulling rate in the range of 0.08–0.15 mm/min. The crystallization interface was flat, with meniscus length equal to the fiber radii. The absorption and emission spectra were measured at room temperature. The absorption and emission cross sections of the Eu3+, Er3+, and Tm3+ transitions were evaluated. For the erbium cation we register 4S3/24I15/2, 2H11/24I15/2 transitions in the visible and 4I13/24I15/2 in IR range. The emission spectra recorded in the visible and infrared range with fluorescence correspond to 1G43F4 +3F2, 3F33H6, 3H43H6, and 1G43H5 for the thulium, instead for the europium we have 5D1→7F1,2 and 5D07F0-1-2-3-4, transitions. This last one presents an excellent structural probe for investigating the local environment of Eu3+ dopant in LiGd(WO4)2 host. The fluorescence lifetimes associated to these intense transitions were investigated. The polarized IR and Raman spectra of LiGd (WO4)2 single crystal fiber were measured, parallel and perpendicular to the fibers growth direction. We observed a bonds at 915 cm-1 for IR and 913 cm-1 for Raman corresponding of the symmetric stretching mode of the isolated tetrahedra (WO4)-2 group.
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Dates and versions

hal-02557855 , version 1 (11-12-2020)

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B. Rekik, G. Alombert-Goget, Alice Berthelot, O. Benamara, K. Lebbou. Optical properties of 2 at %(Ln3+) doped LiGd(WO4)2 with Ln; Eu, Er and Tm, grown by μ-pulling down technique. Journal of Alloys and Compounds, 2020, 830, pp.154165. ⟨10.1016/j.jallcom.2020.154165⟩. ⟨hal-02557855⟩
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