Study of formation of deep trapping mechanism by UV, beta and gamma irradiated Eu 3+ activated SrY 2 O 4 and Y 4 Al 2 O 9 phosphors

Dubey, Vikas; Kaur, Jaspreet; Parganiha, Yogita; Suryanarayana, N. S.; Murthy, K. V. R.

doi:10.1016/j.apradiso.2015.12.047

Cited by 23 publications

(2 citation statements)

References 24 publications

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“…In that way, temperature of preparation of material was reduced as well as particle size with improvement of luminescence properties. Dubey et al, obtained SrY 2 O 4 doped with Eu 3+ by solid state reaction at 1400 °C [25]. Characterization of material showed that Eu 3+ ion is accommodating in 2 non-equivalent sites of Y 3+ and one site of Sr 2+ .…”

Section: Introductionmentioning

confidence: 99%

Effect of Eu3+ - dopant concentration on structural and luminescence properties of SrY2O4 nanocrystalline phosphor and potential application in dye-sensitized solar cells

Lojpur¹,

Stojadinović

Mitrić³

2018

SCI SINTER

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SrY 2 O 4 phosphors were doped with different concentrations of Eu 3+ (0.5, 1, 2, 4, 8 and 10 at %) in order to investigate the maximal doping concentration of Eu 3+ and its implementation in solar cell devices. Samples were synthesized by a combustion method using citric acid and glycine as a fuel. The X-ray diffraction (XRD) patterns confirmed pure phase of SrY 2 O 4. FE-SEM micrographs showed agglomerate phenomenon with spherical-like shape particles and diameter of about 50 nm. Upon excitation with 280 nm, emission spectra were recorded in the range from 450-750 nm and in all samples the same energy transitions were observed 5 D 0 → 7 F J (J = 1, 2, 3 and 4) with maximal intensity for sample with 8 at % of Eu 3+. That sample was further examined for the purpose of application in solar cell devices and showed high value of efficiency at low light intensities.

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Section: Introductionmentioning

confidence: 99%

Effect of Eu3+ - dopant concentration on structural and luminescence properties of SrY2O4 nanocrystalline phosphor and potential application in dye-sensitized solar cells

Lojpur¹,

Stojadinović

Mitrić³

2018

SCI SINTER

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“…Eu 3+ doped YAM [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] were prepared, and some photoluminescent studies were performed for visible emitting devices and structural probes. Ma et al [5] studied the (Y 1-x Eu x ) 4 Al 2 O 9 composition with x ranging from 0 to 0.60 and found that x = 0.10 presented a maximum photoluminescence (PL) emission; in higher concentrations, the quenching effects took place.…”

Section: Introductionmentioning

confidence: 99%

Structural and spectroscopic properties of Eu3+ doped Y4Al2O9 compounds through a soft chemical process

Gasparotto¹,

Tavares²,

Silva

et al. 2018

Journal of Luminescence

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The present work reports on the synthesis, structural and optical properties of (Y 1-x Eu x) 4 Al 2 O 9 powders, with x ranging from 0.001 to 0.030. We prepared the materials using a modified polymeric precursors method, and the effect of annealing temperature and Eu 3+ concentrations were evaluated. Structural and microstructural parameters, such as cell parameters, crystallite size and grain size were determined and evaluated by using the results from X-ray diffraction and high-resolution transmission electron microscopy techniques. An annealing temperature of 800°C was enough to obtain single Y 4 Al 2 O 9 crystalline phase with good distribution of Eu 3+ ions. Diffuse reflectance spectra and optical bandgap of 4.52 eV for (Y 0.995 Eu 0.005) 4 Al 2 O 9determined by Kubelka-Munk modelshowed good optical quality of the samples, which were considered non-conducting. All doped samples possessed visible photoluminescence emission from Eu 3+ ions under excitation at 393 nm, with higher emissions occurring in the red region from 5 D 0 → 7 F 2 transition, with R/O relation of 1.69 for the sample with x = 0.010. Analyzing photoluminescence emission spectra, the lifetime values and Judd-Ofelt parameters, we determined that Eu 3+ occupied three different sites of the Y 4 Al 2 O 9 (YAM) structure, replacing Y 3+ ions, with the quenching concentration occurring between x = 0.020 and x = 0.030. We noted that Eu 3+ ions are in a chemical environment with low polarization, and their degree of covalence is low. Finally, samples with x = 0.020 (Y 0.980 Eu 0.020) 4 Al 2 O 9 seems to be useful as red phosphors.

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Novel Tool to Determine Kinetic Parameters of Thermoluminescence (TL) Glow Curve—CGCD: CaZrO3: Eu3+, Tb3+

Tripathi

Awate

Kushwah

et al. 2019

International Conference on Intelligent Computing and Smart Communication 2019

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Study of formation of deep trapping mechanism by UV, beta and gamma irradiated Eu 3+ activated SrY 2 O 4 and Y 4 Al 2 O 9 phosphors

Cited by 23 publications

References 24 publications

Effect of Eu3+ - dopant concentration on structural and luminescence properties of SrY2O4 nanocrystalline phosphor and potential application in dye-sensitized solar cells

Effect of Eu3+ - dopant concentration on structural and luminescence properties of SrY2O4 nanocrystalline phosphor and potential application in dye-sensitized solar cells

Structural and spectroscopic properties of Eu3+ doped Y4Al2O9 compounds through a soft chemical process

Novel Tool to Determine Kinetic Parameters of Thermoluminescence (TL) Glow Curve—CGCD: CaZrO3: Eu3+, Tb3+

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