Luminescence of LiBaF3 and KMgF3 doped with Eu2+

Mahlik, Sebastian; Wiśniewski, K.; Seo, Hyo Jin

doi:10.1016/j.jnoncrysol.2010.05.020

Cited by 16 publications

(6 citation statements)

References 19 publications

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“…With this diagram, the luminescence properties and temperature dependence of the Eu 2+ emission in Sr 4 Al 14 O 25 can be understood. A transition from ETE emission to 4f 6 5d emission has been observed before and can be induced by pressure changes. , The pressure dependence for the 4f 6 5d and ETE states is different, and by increasing pressure, a crossing of the 4f 6 5d state below the ETE state has been demonstrated and explained using a sophisticated model for the pressure dependence of both the 4f 6 5d and ETE states. The presently observed temperature induced change between ETE and 4f 6 5d emission has been observed before in CsCaF 3 :Eu 2+ and Ba 0.3 Sr 0.7 F 2 :Eu 2+ .…”

Section: Resultsmentioning

confidence: 86%

Anomalous Trapped Exciton and d–f Emission in Sr₄Al₁₄O₂₅:Eu²⁺

et al. 2014

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The photoluminescence and time-resolved emission for Eu(2+) in Sr4Al14O25 has been investigated in the temperature range 4 to 500 K. The Eu(2+) emission changes in a peculiar way with temperature. At low temperature two emission bands are observed at 490 and 425 nm, which are attributed to emission from Eu(2+) on the 7- and 10-coordinated sites. Upon raising the temperature, an unexpectedly large blue shift to 400 nm is observed for the 425 nm emission band. To explain these observations, the 400 and 425 nm emission bands are assigned to d-f and trapped exciton emission, for Eu(2+) on the 10-coordinated site. The trapped exciton emission is characterized by a short (0.5 μs) decay time. The temperature dependence of the emission is explained by a configurational coordinate diagram in which the Eu(2+) trapped exciton state is at a slightly lower energy than the lowest energy 4f(6)5d state. Upon raising the temperature, the 4f(6)5d state is thermally populated and emission from this state is observed, and because of the smaller lattice relaxation (smaller Stokes shift), a large blue shift from 425 to 400 nm is observed.

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Section: Resultsmentioning

confidence: 86%

Anomalous Trapped Exciton and d–f Emission in Sr₄Al₁₄O₂₅:Eu²⁺

et al. 2014

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“…Study shows that such a structure can make the crystal a promising material for scintillator applications due to the scintillator mechanism of core‐valence luminescence activated : the holes in the outermost core band located below the valence band generated by incident high energy radiation can recombine with the electrons in the valence band to generate photons. In addition, the wide bandgap can make the crystal a good host for doping to study the properties of luminescence spectra . Similar sub‐band structures were also found in CsCaF 3 and KMgF 3 although these two are normal fluoroperovskites.…”

Section: Resultsmentioning

confidence: 57%

Electronic and elastic properties of BaLiF₃with pressure effects: First-principles study

Cui

Wang

et al. 2016

Phys. Status Solidi B

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BaLiF 3 is an important optical crystal for use as a window material in the ultraviolet region. In this work, we studied the electronic and elastic properties of BaLiF 3 with pressure effects by the generalized gradient approximation within the density-functional method. Studies indicate that BaLiF 3 is mechanically stable and almost elastically isotropic up to 190 GPa, which is considerably higher than the previously reported value. The changing trends of its elastic constants, bulk modulus, B/G ratio, Poisson ratio, and Debye temperature with pressure were systematically investigated. Electronic property calculations reveal that BaLiF 3 is an ionic insulator with a bandgap of 6.14 eV at 0 GPa and the bandgap is formed by Ba-5d states and F-2p states. Two interesting phenomena are found: one is that the bandgap of BaLiF 3 first increases and then decreases with increasing pressure and the reason for this is explored. Another is that Li-2s states only appear above the Fermi level in this inverted fluoroperovskite.

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“…This effect is achieved by increasing the binding energy of excitons, resulting in highly localized excitons, which reduces carrier scattering. 96 Therefore, pressure can finely tune the optical properties of HPs, ameliorating their performance. Wang et al demonstrated the enhancement of pressure-induced photoluminescence in C 4 N 2 H 14 PbBr 4 .…”

Section: Mechano-induced Fluorescence Modulationmentioning

confidence: 99%

Variable halide perovskites: diversification of anti-counterfeiting applications

Shi,

Zhao,

Zhou

et al. 2023

Mater. Chem. Front.

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Luminescence of LiBaF3 and KMgF3 doped with Eu2+

Cited by 16 publications

References 19 publications

Anomalous Trapped Exciton and d–f Emission in Sr₄Al₁₄O₂₅:Eu²⁺

Anomalous Trapped Exciton and d–f Emission in Sr₄Al₁₄O₂₅:Eu²⁺

Electronic and elastic properties of BaLiF₃with pressure effects: First-principles study

Variable halide perovskites: diversification of anti-counterfeiting applications

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Luminescence of LiBaF3 and KMgF3 doped with Eu2+

Cited by 16 publications

References 19 publications

Anomalous Trapped Exciton and d–f Emission in Sr4Al14O25:Eu2+

Anomalous Trapped Exciton and d–f Emission in Sr4Al14O25:Eu2+

Electronic and elastic properties of BaLiF3with pressure effects: First-principles study

Variable halide perovskites: diversification of anti-counterfeiting applications

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Anomalous Trapped Exciton and d–f Emission in Sr₄Al₁₄O₂₅:Eu²⁺

Anomalous Trapped Exciton and d–f Emission in Sr₄Al₁₄O₂₅:Eu²⁺

Electronic and elastic properties of BaLiF₃with pressure effects: First-principles study