Synchrotron spectroscopy of confined carriers in CdF2-CaF2 superlattices

Ivanovskikh, Konstantin V.; Hughes-Currie, Rosa B.; Reid, Michael F.; Wells, J.‐P. R.; Sokolov, N. S.; Reeves, Roger J.

doi:10.1063/1.4943498

Cited by 4 publications

(6 citation statements)

References 43 publications

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“…As the reduced graphene oxide attaches to the surface of Ce 3+ -doped binary fluorides, it (GO) can enhance the crystal field strength, which leads to the splitting as well as shifting of the excitation peak to a higher energy side. Similarly, Reeves et al reported the optical properties of CdF 2 –CaF 2 superlattices using synchrotron spectroscopy of confined carriers and measured the exciton emission . Also in their experiment they have mentioned the exciton confinement phenomenon.…”

Section: Resultsmentioning

confidence: 95%

“…In semiconductors, size-dependent photoluminescence properties are found due to the quantum-confinement effect. 55 Consequently, excitation and emission bands are significantly shifted on varying the size of the particles. However, except the Ce 3+ ion, other RE 3+ -doped nanoparticles show size-independent photoluminescence behavior due to their f-f electronic transition.…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, Reeves et al reported the optical properties of CdF 2 –CaF 2 superlattices using synchrotron spectroscopy of confined carriers and measured the exciton emission. 55 Also in their experiment they have mentioned the exciton confinement phenomenon.…”

Section: Resultsmentioning

confidence: 99%

“…In semiconductors, size-dependent photoluminescence properties are found due to the quantum-confinement effect . Consequently, excitation and emission bands are significantly shifted on varying the size of the particles.…”

Section: Resultsmentioning

confidence: 99%

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Multifunctional Lanthanide-Doped Binary Fluorides and Graphene Oxide Nanocomposites Via a Task-Specific Ionic Liquid

et al. 2022

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Graphene oxide-based nanocomposites (NCMs) exhibit diverse photonic and biophotonic applications. Innovative nanoengineering using a task-specific ionic liquid (IL), namely, 1-butyl-3-methyl tetrafluoroborate [C 4 mim][BF 4 ], allows one to access a unique class of luminescent nanocomposites formed between lanthanide-doped binary fluorides and graphene oxide (GO). Here the IL is used as a solvent, templating agent, and as a reaction partner for the nanocomposite synthesis, that is, “all three in one”. Our study shows that GO controls the size of the NCMs; however, it can tune the luminescence properties too. For example, the excitation spectrum of Ce 3+ is higher-energy shifted when GO is attached. In addition, magnetic properties of GdF 3 :Tb 3+ nanoparticles (NPs) and GdF 3 :Tb 3+ -GO NCMs are also studied at room temperature (300 K) and very low temperature (2 K). High magnetization results for the NPs (e.g., 6.676 emu g –1 at 300 K and 184.449 emu g –1 at 2 K in the applied magnetic field from +50 to −50 kOe) and NCMs promises their uses in many photonic and biphotonic applications including magnetic resonance imaging, etc.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Multifunctional Lanthanide-Doped Binary Fluorides and Graphene Oxide Nanocomposites Via a Task-Specific Ionic Liquid

et al. 2022

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“…СР, сформированные на основе фторидов кадмия, перспективны в плане их использования при изготовлении туннельных диодов и каскадных лазеров [6].…”

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Структурная характеризация короткопериодной сверхрешетки на основе гетероструктуры CdF-=SUB=-2-=/SUB=-/CaF-=SUB=-2-=/SUB=-/Si(111) методами просвечивающей электронной микроскопии и рентгеновской дифрактометрии

Sorokin¹,

Кютт²,

Ратников³

et al. 2021

Письма В Журнал Технической Физики

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A detailed study of the structure of a short-period superlattice based on alternating layers of cadmium and calcium fluorides, grown by molecular beam epitaxy on a Si (111) substrate, by transmission electron microscopy and X-ray diffractometry, has been carried out. It was found that the superlattice is in a pseudomorphic state, and a lateral inhomogeneity with a fragment size of 10 - 40 nm was found. The reason for the broadening of the main and satellite peaks of the SL on the (111) diffraction curve has been clarified.

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Determination of charge-compensated C _3υ (II) centers for Er³⁺ ions in CdF₂ and CaF₂ crystals*

Chai¹,

Hao²,

Gao³

et al. 2021

Chinese Phys. B

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A unified theoretical method is established to determine the charge-compensated C 3v (II) centers of Er3+ ions in CdF2 and CaF2 crystals by simulating the electron paramagnetic resonance (EPR) parameters and Stark energy levels. The potential (Er3+–F−– O 4 2 − ) and (Er3+– F 7 − –O2–) structures for the C 3v (II) centers of Er3+ ions in CdF2 and CaF2 crystals are checked by diagonalizing 364 × 364 complete energy matrices in the scheme of superposition model. Our studies indicate that the C 3v (II) centers of Er3+ ions in CdF2 and CaF2 may be ascribed to the local (Er3+–F−– O 4 2 − ) structure, where the upper ligand ion F− undergoes an off-center displacement by ΔZ ≈ 0.3 Å for CdF2 and ΔZ ≈ 0.29 Å for the CaF2 along the C 3 axis. Meanwhile, a local compressed distortion of the ( ErFO 4 ) 6 − cluster is expected to be ΔR ≈ 0.07 Å for CdF2:Er3+ and ΔR ≈ 0.079 Å for CaF2:Er3+. The considerable g-factor anisotropy for Er3+ ions in each of both crystals is explained reasonably by the obtained local parameters. Furthermore, our studies show that a stronger covalent effect exists in the C 3v (II) center for Er3+ in CaF2 or CaF2, which may be due to the stronger electrostatic interaction and closer distance between the central Er3+ ion and ligand O2– with the (Er3+–F−– O 4 2 − ) structure.

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Synchrotron spectroscopy of confined carriers in CdF2-CaF2 superlattices

Cited by 4 publications

References 43 publications

Multifunctional Lanthanide-Doped Binary Fluorides and Graphene Oxide Nanocomposites Via a Task-Specific Ionic Liquid

Multifunctional Lanthanide-Doped Binary Fluorides and Graphene Oxide Nanocomposites Via a Task-Specific Ionic Liquid

Determination of charge-compensated C _3υ (II) centers for Er³⁺ ions in CdF₂ and CaF₂ crystals*

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Synchrotron spectroscopy of confined carriers in CdF2-CaF2 superlattices

Cited by 4 publications

References 43 publications

Multifunctional Lanthanide-Doped Binary Fluorides and Graphene Oxide Nanocomposites Via a Task-Specific Ionic Liquid

Multifunctional Lanthanide-Doped Binary Fluorides and Graphene Oxide Nanocomposites Via a Task-Specific Ionic Liquid

Determination of charge-compensated C 3υ (II) centers for Er3+ ions in CdF2 and CaF2 crystals*

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Determination of charge-compensated C _3υ (II) centers for Er³⁺ ions in CdF₂ and CaF₂ crystals*