Reassignment of electronic transitions in the laser-activated spectrum of nanocrystalline Y2O3:Er3+

Engelsen, Daniel den; Fern, George R.; Ireland, Terry G.; Silver, Jack

doi:10.1016/j.jlumin.2017.12.053

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…6 an Arrhenius plot of the maximum radiances of BaAl 2 O 4 :Eu 2+ and SrAl 2 O 4 :Eu 2+ has been inserted. As described in our previous work on the LA-spectra of Y 2 O 3 :Er 3+ [49], the thermal quenching of luminescence in phophors can be represented by the Fermi-Dirac equation with one barrier energy E q :…”

Section: Photoluminescence and Cathodoluminescencementioning

confidence: 99%

Photoluminescence and cathodoluminescence of BaAl₂O₄:Eu²⁺ and undoped BaAl₂O₄: evidence for F-centres

Engelsen¹,

Fern²,

Ireland³

et al. 2020

Opt. Mater. Express

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In this article the photoluminescence (PL) and cathodoluminescence (CL) of undoped BaAl 2 O 4 and BaAl 2 O 4 doped with 500 ppm and 3 mol% Eu 2+ is described. The most important results from the CL measurements are: (1) Undoped BaAl 2 O 4 manifested intrinsic CL at 460 nm, which increased at low temperature and did not change significantly upon exposure to the e-beam; (2) Doping BaAl 2 O 4 with Eu 2+ changed the character of the intrinsic luminescence band: it became more sensitive to temperature variations and the band experienced a blue shift to ∼425 nm; (3) electron beam (e-beam) exposure of Ba 0.97 Eu 0.03 Al 2 O 4 at low temperature increased the 425 nm band strongly while the Eu 2+ emission at ∼500 nm decreased by about 70%. The Eu 2+ emission band was symmetric, indicating that BaAl 2 O 4 :Eu has changed to the P6 3 22 phase upon e-beam exposure at low temperature; (4) We have identified the 460 nm band in undoped BaAl 2 O 4 and the 425 nm band in BaAl 2 O 4 :Eu 2+ with F-centre luminescence, corresponding to the F-centre emission in α-Al 2 O 3. The evidence for the assignment of the 425 nm band in BaAl 2 O 4 :Eu 2+ is the spectacular increase of the spectral radiance at 425 nm by e-beam exposure at 200 keV and low temperature. A preliminary model is presented that explains the results. The PL from BaAl 2 O 4 :Eu 2+ quenched at the rather low temperature of 140°C; this observation is explained in terms of thermal ionization of the Eu 2+ ion.

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Section: Photoluminescence and Cathodoluminescencementioning

confidence: 99%

Photoluminescence and cathodoluminescence of BaAl₂O₄:Eu²⁺ and undoped BaAl₂O₄: evidence for F-centres

Engelsen¹,

Fern²,

Ireland³

et al. 2020

Opt. Mater. Express

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“…where P is a pre-exponential factor, E A is the activation energy, k is Boltzmann's constant, T is the absolute temperature, B is the pre-exponential factor in the denominator and E Q is the quenching energy barrier [32]. The nominator of equation (1) describes the low temperature side of the curves in figure 10, while the denominator describes the quenching (a single barrier model) at high temperatures.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

Ultrathin Y₂O₃:Eu³⁺nanodiscs: spectroscopic investigations and evidence for reduced concentration quenching

et al. 2018

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Here, we report the synthesis and spectral properties of ultrathin nanodiscs (NDs) of YO:Eu. It was found that the NDs of YO:Eu with a thickness of about 1 nm can be fabricated in a reproducible, facile and self-assembling process, which does not depend on the Eu concentration. The thickness and morphology of these NDs were determined with small angle x-ray scattering and transmission electron microscopy. We found that the crystal field in these nanoparticles deviates from both the cubic and monoclinic characteristics, albeit the shape of the D → F (J = 0, 1, 2) transitions shows some similarity with the transitions in the monoclinic material. The Raman spectra of the non-annealed NDs manifest various vibration modes of the oleic acid molecules, which are used to stabilise the NDs. The annealed NDs show two very weak Raman lines, which may be assigned to vibrational modes of YO NDs. The concentration quenching of the Eu luminescence of the NDs before annealing is largely suppressed and might be explained in terms of a reduction of the phonon density of states.

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“…Similarly, many fluorescences or emission peaks due to Stark splitting can be observed in micro-Raman studies of Er 3+ doped Y 2 O 3 . Stoke's, and anti-Stoke's shifts can be observed above and below the excitation source (He-Ne laser=633 nm) [28]. Generally, a maximum number of splitting is observed in a highly crystalline lattice.…”

mentioning

confidence: 97%

“…It is to be noted that J=0 (excited state) to J=0 (ground state) is not allowed [19]. The width of the peak and its height depends on onsite symmetry and defects associated with lattice [28]. Similar is the case with the ground state ( 3 H 6 ) of Tm 3+ ions in which J has an even number of electrons.…”

mentioning

confidence: 99%

Observation of Stark splitting in micro upconversion photoluminescence spectra of polycrystalline Ln³⁺ doped Y₂O₃ microspheres

Jayswal¹,

Ningthoujam²,

Moirangthem³

2022

Nanotechnology

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In this study, Yb3+-Er3+-Tm3+ doped Y2O3 microspheres were synthesized using the solvothermal method. Structural, morphological, and elemental analysis was done using XRD, FESEM, and EDX characterization techniques. The optical properties of the samples were determined using UV-Vis-NIR and upconversion photoluminescence measurements. The anti-Stokes emission peaks from these polycrystalline phosphor microspheres were obtained using a commercial micro-photoluminescence setup equipped with a 976 nm laser as an excitation source at room temperature. It was compared with that of a 2-3 mm spot size of 976 nm laser irradiation on the same sample. The micro-emission spectra were analyzed based on possible Stark splitting energy level transitions between the 2S+1LJ manifolds of Er3+ and Tm3+ ions. A detailed mechanism is outlined for emission in the entire visible region under 976 nm laser excitation.

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Reassignment of electronic transitions in the laser-activated spectrum of nanocrystalline Y2O3:Er3+

Cited by 8 publications

References 21 publications

Photoluminescence and cathodoluminescence of BaAl₂O₄:Eu²⁺ and undoped BaAl₂O₄: evidence for F-centres

Photoluminescence and cathodoluminescence of BaAl₂O₄:Eu²⁺ and undoped BaAl₂O₄: evidence for F-centres

Ultrathin Y₂O₃:Eu³⁺nanodiscs: spectroscopic investigations and evidence for reduced concentration quenching

Observation of Stark splitting in micro upconversion photoluminescence spectra of polycrystalline Ln³⁺ doped Y₂O₃ microspheres

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Reassignment of electronic transitions in the laser-activated spectrum of nanocrystalline Y2O3:Er3+

Cited by 8 publications

References 21 publications

Photoluminescence and cathodoluminescence of BaAl2O4:Eu2+ and undoped BaAl2O4: evidence for F-centres

Photoluminescence and cathodoluminescence of BaAl2O4:Eu2+ and undoped BaAl2O4: evidence for F-centres

Ultrathin Y2O3:Eu3+nanodiscs: spectroscopic investigations and evidence for reduced concentration quenching

Observation of Stark splitting in micro upconversion photoluminescence spectra of polycrystalline Ln3+ doped Y2O3 microspheres

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Photoluminescence and cathodoluminescence of BaAl₂O₄:Eu²⁺ and undoped BaAl₂O₄: evidence for F-centres

Photoluminescence and cathodoluminescence of BaAl₂O₄:Eu²⁺ and undoped BaAl₂O₄: evidence for F-centres

Ultrathin Y₂O₃:Eu³⁺nanodiscs: spectroscopic investigations and evidence for reduced concentration quenching

Observation of Stark splitting in micro upconversion photoluminescence spectra of polycrystalline Ln³⁺ doped Y₂O₃ microspheres