Optical properties of Cr³⁺ doped Na₅Lu₉F₃₂ single crystals grown by the Bridgman method

Abstract

The growth of Na₅Lu₉F₃₂ single crystals doped with Cr³⁺ ions in 0.1 mol%, 0.2 mol% and 0.5 mol% concentrations by Bridgman method was reported. The optical absorption and luminescence spectra decisively demonstrate that the Cr dopant enters Na₅Lu₉F₃₂ as Cr³⁺. Fluorescence emission at wavelengths of 418 nm, 444 nm, 653 nm and 678 nm can be observed under the excitation of 372 nm and the fluorescence lifetime at 418 nm was measured to be ∼10.31 μs. The possible crystal sites for Cr³⁺ ions in Na₅Lu₉F₃₂ single crystal were discussed, and the lattice parameter Dq, Racach parameters B and C were estimated.

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