Crystal-Field Splittings and Phonon Effects on a Sharp Emission Line within a Manifold of Pr3+ in Ca5(PO4)3F Laser Host

Sardar, Dhiraj K.; Yow, Raylon M.; Sayka, Anthony

doi:10.1002/1521-3951(200102)223:3<691::aid-pssb691>3.0.co;2-c

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…These reabsorption peaks in the emission spectra at 448, 473 and 487 nm correspond to 3 H 4 -3 P 2 , 3 H 4 -3 P 1 , 1 I 6 and 3 H 4 -3 P 0 transitions, respectively [34]. It can be noticed missing of the peak at 595 nm associated with the ground 3 H 4 level and the excited 1 D 2 level which was characteristic for FAP microcrystal doped with Pr 3+ , and nanocrystal as well [8,18,34]. This is due to the presence of anionic species that quenching luminescence and high energy transfer efficiencies between the nano-FAP host matrix and the dopant ion.…”

Section: Photoluminescence Properties Of Obtained Nanopowdersmentioning

confidence: 95%

“…All substitutions of FAP crystal structure exist in nature and most of them can be reproduced in laboratory conditions [6]. According to the literature, luminescent RE 3+doped FAP materials were synthesized using high-temperature methods [18], hydrothermal methods under temperature and pressure [19] or precipitation methods that follow hightemperature calcination [8]. In a previous study of Milojkov et al [8], nanocrystals of Pr 3+ doped FAP were precipitated under mild conditions, followed by calcination at 700 • C. In this study, poorly crystallized nanopowders of FAP co-doped with Pr 3+ and CO 3 2− were synthesized by the precipitation, the first step of the method described in [8], and obtained nanopowders were characterized according to crystallinity, morphology and chemical content.…”

Section: Introductionmentioning

confidence: 90%

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Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation

Milojkov

Sokić

Radosavljević-Mihajlović

et al. 2021

Metals

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Coupled substitution of fluorapatite (FAP) crystal lattice plays an important role in the engineering of optically active nanomaterials. Uniform fluorapatite nanopowders doped with praseodymium (Pr3+) and carbonate (CO32−) ions have been successfully synthesized by precipitation method under room temperature (25 °C). The structural, morphological, chemical and optical properties of monophase material were characterized by X-ray diffraction (XRD), Fourier Transform Infrared and Far Infrared Spectroscopy (FTIR and FIR, respectively), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), Transmission Electron Microscopy (TEM) and Photoluminescence Spectroscopy (PL). Coupled substitution of FAP crystal lattice with Pr3+ and CO32− reduces the crystallite size with a constant c/a ratio of 1.72. FTIR study showed that synthesized nanopowders were AB-type CO32− substitution, and FIR study revealed new Pr–O vibrations. TEM analysis was found that synthesized nanopowders were composed of irregular spheres in the nanometer range. The fluorescence of FAP nanoparticles was in the violet-blue region of the visible part of the spectrum. When Pr3+ was doped in a lattice, the violet-blue emission becomes sharper due to reabsorption. MCR–ALS analyses of fluorescence spectra indicated the shift of the maximum to the blue color with the increase in the concentration of Pr3+ ions. Additionally, luminescent nanopowders demonstrated significant antibacterial activity against Escherichia coli. As the obtained nanoparticles showed a good absorption of ultraviolet A light and reabsorption of blue-green luminescence, they are suitable for further development of optically active nanomaterials for light filtering. Optically active PrCFAP nanopowders with antibacterial properties may be promising additives for the development of multifunctional cosmetic and health care products.

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Section: Photoluminescence Properties Of Obtained Nanopowdersmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 90%

Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation

Milojkov

Sokić

Radosavljević-Mihajlović

et al. 2021

Metals

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Temperature effects on the 1.0 and 1.3 μm emission lines of Nd3+ in a LaSc3(BO3)4 crystal host

Sardar

French

González-Castaño

et al. 2002

Journal of Applied Physics

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A detailed investigation of the temperature effect on widths and shifts of the spectral lines of Nd3+ in LaSc3(BO3)4 has been performed. The spectral lines investigated correspond to the inter-Stark transitions R1→Y3 (1062 nm) and R1→Z4 (1344 nm) within the F3/24→4I11/2 and F3/24→4I13/2 intermanifold transitions, respectively. The widths of these lines and their shifts have been measured as a function of temperature. The linewidths are found to increase with increasing temperature for both transitions; the 1062 nm line shifts to the longer wavelengths, whereas the 1344 nm line shifts to the shorter wavelengths. The theory of phonon-ion interactions has been employed to explain the temperature dependencies of widths and shifts. These interactions give rise to the phonon relaxation processes that are responsible for both the broadening and shifts of the spectral lines.

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Optical transitions, absorption intensities, and intermanifold emission cross sections of Pr3+(4f2) in Ca5(PO4)3F crystal host

Sardar

Russell

2004

Journal of Applied Physics

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A spectroscopic Judd–Ofelt investigation has been performed on Pr3+ ions doped in calcium fluorapatite, Ca5(PO4)3F, belonging to the apatite structure family. The standard Judd–Ofelt analysis was applied to the room temperature absorption intensities of Pr3+ transitions to determine the phenomenological intensity parameters: Ω2, Ω4, and Ω6. Values of the intensity parameters were subsequently used to determine the decay rates (emission probabilities), radiative lifetimes, and branching ratios of the principal intermanifold transitions of Pr3+ from the P23, D21, and P03 manifold states to the lower-lying manifolds. In addition, the room temperature fluorescence lifetimes and emission cross sections of the P23→H53, D21→H43, and P03→F23 transitions were measured; these values were compared with those of Nd3+:yttritium–aluminum–garnet and Pr3+:Sr5(PO4)3 (known as S–FAP).

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Crystal-Field Splittings and Phonon Effects on a Sharp Emission Line within a Manifold of Pr3+ in Ca5(PO4)3F Laser Host

Cited by 3 publications

References 19 publications

Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation

Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation

Temperature effects on the 1.0 and 1.3 μm emission lines of Nd3+ in a LaSc3(BO3)4 crystal host

Optical transitions, absorption intensities, and intermanifold emission cross sections of Pr3+(4f2) in Ca5(PO4)3F crystal host

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