Excitons and interconfigurational transitions in CaF2:Yb2+ crystals

Hughes-Currie, Rosa B.; Salkeld, Alexander J.; Ivanovskikh, Konstantin V.; Reid, Michael F.; Wells, Jon‐Paul R.; Reeves, Roger J.

doi:10.1016/j.jlumin.2014.09.050

Cited by 16 publications

(22 citation statements)

References 22 publications

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“…Among the fluoride compounds, CaF 2 crystals exhibit special properties such as high stability, nonhygroscopic behavior, and good thermal conductivity . Besides, recently CaF 2 gained a renewed interest as a laser material when doped with RE ions . Many researchers have been devoted to the research of CaF 2 transparent ceramics and got some improvements, such as Yb: CaF 2 , Er: CaF 2 , and so on.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF₂ Transparent Ceramics

Mei

Liu

et al. 2016

J. Am. Ceram. Soc.

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Highly transparent Nd‐doped calcium fluoride (Nd: CaF2) ceramics with different Nd‐doped concentrations were fabricated by hot‐pressed method using Nd: CaF2 nanopowders synthesized by coprecipitation method. SEM observations indicated that the average grain size of nanopowders was about 16–30 nm and the average grain size of the ceramics was between 200 nm and 1 μm. The grain boundaries of the ceramics were clean and no pores or impurities were detected. For 2‐mm‐thickness sample, the transmittance of the as‐fabricated 5 at.% Nd: CaF2 ceramic at 1200 nm was about 85%. The absorption coefficient and emission intensity of the Nd: CaF2 ceramics were measured and discussed. From the Nd: CaF2 ceramics fluorescent spectra and the decay curves, it was found that the fluorescent quenching effect became more evident with the increase in the Nd3+ ions‐doped concentration.

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Section: Introductionmentioning

confidence: 99%

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF₂ Transparent Ceramics

Mei

Liu

et al. 2016

J. Am. Ceram. Soc.

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“…Energy transfer from STEs to luminescent centres has been shown in other materials [11,12]. A schematic of this process is shown in our previous paper on VUV spectroscopy of CaF 2 :Yb 2 þ [13].…”

Section: Resultsmentioning

confidence: 82%

“…When NaMgF 3 :Yb 2 þ is excited into its f d 4 5 13 configuration, its emission is a very broad band with a large Stokes shift indicating that the emission is from an ITE [3]. ITEs are formed when a 5d electron becomes delocalized over surrounding cations.…”

Section: Introductionmentioning

confidence: 99%

Vacuum ultraviolet synchrotron measurements of excitons in NaMgF3:Yb2+

Hughes-Currie

Ivanovskikh

Reid

et al. 2016

Journal of Luminescence

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“…It should be noted at this stage that this term is not to be confused with the also currently prominent impurity-trapped excitons (ITEs) in, e.g. Yb 2+ -doped fluorides that contrarily stem from photoionization of the Yb 2+ ions upon excitation of the electron into the conduction band [96], [97], [98], [99], [100], [101], [102], [103]. The IL-STEs regarded in this paper refer to mobile polaronic STEs along the linear chains in CsMgX 3 (X = Cl, Br, I), which become occasionally localized at impurities.…”

Section: Photoluminescence Spectra Of Impurity-localized Excitons In Csmgx 3 :Eu 2+mentioning

confidence: 99%

Nature of Localized Excitons in CsMgX3 ( X=Cl , Br, I) and Their Interactions with
Suta
¹
,
Lavoie-Cardinal
²
,
Olchowka
³

et al. 2018
Phys. Rev. Applied

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In this paper, the luminescence properties of self-trapped excitons (STEs) of undoped and Eu 2+ doped perovskite-type materials CsMgX3 (X = Cl, Br, I) are presented. The three compounds crystallize isostructurally in a hexagonal crystal system that exhibits an intrinsic pseudo one-dimensionality. This feature has a highly stabilizing effect upon the localization of excitons. Similarities to the properties of STEs in alkali halides are drawn that are justified by band structure and density of states (DOS) calculations.The luminescence spectra of all three halides are characterized and interpreted despite of their high complexity with many emissive transitions. It is illustrated that both self-trapped excitons (STEs) and impurity-localized self-trapped excitons (IL-STEs) are responsible for the features in the spectra . The impurity localization of the STEs is proven by doping the hosts with Sr 2+ ions instead of Eu 2+ ions. The decay times in the µs range indicate that emission predominantly occurs from a triplet state of the STEs with a prominent afterglow component for the IL-STEs that ideally suits a trapping model along the one-dimensional chains of the halides. Moreover, by thermal activation, the excitons tend to annihilate at the Eu 2+ traps thereby inducing an energy transfer to the Eu 2+ ions. Due to this action, an extreme increase of the intensity of the Eu 2+ -based 4f 6 5d-4f 7 emission at room temperature could be observed, which might be a general explanation for unusual temperature-dependent emission intensities of Eu 2+ ions. In general, an understanding of the basic optical properties of the STEs may give some new insights into the mechanism of currently used X-ray storage phosphors as well as scintillators.

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Excitons and interconfigurational transitions in CaF2:Yb2+ crystals

Cited by 16 publications

References 22 publications

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF₂ Transparent Ceramics

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF₂ Transparent Ceramics

Vacuum ultraviolet synchrotron measurements of excitons in NaMgF3:Yb2+

Nature of Localized Excitons in CsMgX3 ( X=Cl , Br, I) and Their Interactions with
Suta
¹
,
Lavoie-Cardinal
²
,
Olchowka
³

et al. 2018
Phys. Rev. Applied

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Excitons and interconfigurational transitions in CaF2:Yb2+ crystals

Cited by 16 publications

References 22 publications

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF2 Transparent Ceramics

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF2 Transparent Ceramics

Vacuum ultraviolet synchrotron measurements of excitons in NaMgF3:Yb2+

Nature of Localized Excitons in CsMgX3 ( X=Cl , Br, I) and Their Interactions with Suta1, Lavoie-Cardinal2, Olchowka3 et al. 2018Phys. Rev. Applied

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Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF₂ Transparent Ceramics

Effects of Nd Concentration on Microstructure and Optical Properties of Nd: CaF₂ Transparent Ceramics

Nature of Localized Excitons in CsMgX3 ( X=Cl , Br, I) and Their Interactions with
Suta
¹
,
Lavoie-Cardinal
²
,
Olchowka
³

et al. 2018
Phys. Rev. Applied