Theoretical spectroscopic investigation of the Eu3+ local symmetry in LiF through crystal field models

Mesquita, Bruno Ribeiro de; Santos, M.A. Couto dos

doi:10.1016/j.optmat.2019.109480

Cited by 4 publications

(4 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[5,6] So far, two main effective ways of using sensitizers with high absorption in near-ultraviolet and blue and high energy transfer with Eu 3 + ions and utilizing modifiers to adjust the Eu 3 + ion local crystal field have been applied to improve the characteristics of absorption and emission of Eu 3 + ions. [7][8][9] Previous research has demonstrated that the incorporation of both non-active rare earths and alkali-earth metal ions could impact the luminous spectra of RE ions due to the modification of the dopants for the crystal lattice structure. [10,11] In this study, Na 5 Lu 9 F 32 crystals doped with fixed Eu 3 + and different Gd 3 + contents were grown employing by a Bridgman method.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the very weak and narrow absorption of Eu 3+ ions in the region of near‐ultraviolet and blue, resulting in low quantum efficiency for most Eu 3+ doped phosphors is the main factor to limit its development because the 4 f –4 f transitions of Eu 3+ ions are forbidden [5,6] . So far, two main effective ways of using sensitizers with high absorption in near‐ultraviolet and blue and high energy transfer with Eu 3+ ions and utilizing modifiers to adjust the Eu 3+ ion local crystal field have been applied to improve the characteristics of absorption and emission of Eu 3+ ions [7–9] …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Red Emission of Na₅Lu₉F₃₂: Eu³⁺ Single Crystal by Introducing of GdF₃

Zou,

Fang,

Zhou

et al. 2024

Eur J Inorg Chem

View full text Add to dashboard Cite

The bulk Na5Lu9F32 single crystals with high quality Serial Eu3+/Gd3+ co‐doped were grown by an ameliorative Bridgman technique. The measurement of X‐ray diffraction (XRD) and analysis of Rietveld refinement were implemented to validate the crystal phase. The Eu3+ doped Na5Lu9F32 single crystal emits intense red emission at 611 nm excited by 394 nm light. The intensity of 1.8 mol% Gd3+ doped sample is boosted by 3.56 times compared with the un‐doped one. The doping of Gd3+ ions replace competitively Lu3+ lattice sites with Eu3+ ions. Thus, they cause the lattice distortion and reduction of symmetry, enabling Eu3+ ions to overcome their 4f forbidden transitions. The change of Eu3+ ion local environment induced by Gd3+ ion doping was explored by the Eu3+ emission spectra and the variations of ratios between red and orange emission intensities (R/O). The fluorescence lifetime indicate that the introduction of GdF3 decrease the probability of non‐radiative transitions and increases the fluorescence lifetime. These results demonstrated that the Na5Lu9F32: Eu3+ single crystal doped with an appropriate concentration of GdF3 is a type of promising red emission single crystal for related optical devices of detectors and laser due to its strong red emission, high transparency and high physico‐chemical stability.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Red Emission of Na₅Lu₉F₃₂: Eu³⁺ Single Crystal by Introducing of GdF₃

Zou,

Fang,

Zhou

et al. 2024

Eur J Inorg Chem

View full text Add to dashboard Cite

show abstract

“…[12,13] These models with this method have also been widely used and applied in several studies. [14][15][16][17][18] Atomic-scale simulation can be used to develop an understanding of the relationship between intrinsic defects caused by the presence of the Eu and how these defects affect the luminescent properties of the material. Thus, this work consists of computational modeling in order to shed light on the most energetically probable defects and their interaction with the lattice as well as to perform a crystalline field study of MgGa 2 O 4 :Eu.…”

Section: Introductionmentioning

confidence: 99%

“…[ 12,13 ] These models with this method have also been widely used and applied in several studies. [ 14–18 ]…”

Section: Introductionmentioning

confidence: 99%

Defects and Spectroscopic Investigation of Eu³⁺ Doping in MgGa₂O₄

Sousa,

de Mesquita,

Oliveira

et al. 2024

Physica Status Solidi (b)

View full text Add to dashboard Cite

Atomistic simulation is performed to study the defect properties and spectroscopy in the MgGa2O4 structure. The calculations indicate that the most favorable type of intrinsic defect is generated by the cation antisite defect, in which there is an exchange of positions between Mg2+ and Ga3+ ions. The calculation also indicates that the incorporation of Eu3+ dopant at the Ga3+(2) site is the most energetically favorable. According to a spectroscopic study using the crystal field approach, Eu3+ replaces the Ga3+ site occupying a combination of C4 and C4h symmetries while maintaining the same amount of the non‐null crystal field parameters. This result is important for the reproduction of experimental energy sublevels and ΔE (7F1) manifold splitting.

show abstract