Kinetics of luminescence calcium gallate activated by Yb3+, Er3+ ions

The paper presents the results of a study of the luminescent properties of calcium gallate activated by trivalent rare earth ions Yb3+ and Er3+. IR luminescence spectra of samples with a single activator Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4 were studied when excited by radiation sources with a wavelength of 940 and 790 nm, respectively. The dependence of the luminescence intensity of samples on the concentration of rare earth ions is obtained. When the two-activator composition of Ca1‑х‑yYbxEryGa2O4 is excited by a semiconductor laser diode with a wavelength of 940 nm, IR luminescence is registered in the regions of 980-1100 nm and 1450-1670 nm. The radiation in these bands corresponds to electronic transitions in Yb3+ and Er3+ ions, respectively. For a luminescence band with a maximum at a wavelength of 1540 nm, the excitation spectra were measured, the maximum intensity is at the wavelengths: 930, 941, 970, 980 nm. The dependence of the IR luminescence intensity of a solid solution of Ca1‑х‑yYbxEryGa2O4 on the concentration of Er3+ ions was studied. With an increase in the concentration of Er3+ ions in the luminescence spectra, there is a redistribution in the intensity of the bands belonging to Yb3+ and Er3+ ions, which indicates the presence of energy transfer processes between these ions. The kinetics of IR luminescence attenuation was studied for series with one and two activators: Ca1‑хYbxGa2O4,Ca1‑хErxGa2O4, Ca1‑х‑yYbxEryGa2O4. It is established that the luminescence attenuation occurs mainly according to the exponential law, which indicates the predominance of the intracenter luminescence mechanism in the studied structures. Based on the analysis of the excitation and luminescence spectra of experimental samples, conclusions are made about the interaction of Yb3+ and Er3+ activator ions in the crystal lattice of calcium gallate.

Download Full-text

VUV-Luminescence and Excitation Spectra of the Heavy Trivalent Rare-Earth Ions in Fluoride Matrices

Physics of the Solid State ◽

10.1134/1.2014480 ◽

2005 ◽

Vol 47 (8) ◽

pp. 1416 ◽

Cited By ~ 8

Author(s):

M. Kirm

Keyword(s):

Rare Earth ◽

Rare Earth Ions ◽

Excitation Spectra ◽

Trivalent Rare Earth

Download Full-text

Erratum: “VUV-Luminescence and Excitation Spectra of the Heavy Trivalent Rare-Earth Ions in Fluoride Matrices” [Physics of the Solid State 47, 1416 (2005)]

Physics of the Solid State ◽

10.1134/1.2131168 ◽

2005 ◽

Vol 47 (11) ◽

pp. 2203

Author(s):

M. Kirm

Keyword(s):

Rare Earth ◽

Solid State ◽

Rare Earth Ions ◽

Excitation Spectra ◽

Trivalent Rare Earth

Download Full-text

Thermoluminescence and X-Ray Stimulated Luminescence of CaF2:Eu Crystals

Canadian Journal of Physics ◽

10.1139/p73-049 ◽

1973 ◽

Vol 51 (4) ◽

pp. 382-388 ◽

Cited By ~ 8

Author(s):

R. W. Ward ◽

P. W. Whippey

Keyword(s):

Spectral Analysis ◽

Rare Earth ◽

Single Crystals ◽

Rare Earth Ions ◽

Recombination Process ◽

Emission Lines ◽

Luminescence Spectra ◽

X Ray ◽

Trivalent Rare Earth ◽

The Eu

The X-ray luminescence and thermoluminescence due to Eu ions in CaF2 have been investigated. Thermoluminescent glow curves of CaF2 single crystals containing several different concentrations of europium have been measured between 4.2 K and 400 K. Spectral analysis of the two major glow peaks at 92 K and 240 K shows that the luminescence is due mainly to Eu2+ ions. The available evidence suggests the thermoluminescence of Eu2+ in CaF2 is a hole-type recombination process similar to the generally accepted mechanism for thermoluminescence from trivalent rare-earth ions in CaF2. In addition to the Eu2+ emission, lines are observed at lower energies in the X-ray luminescence spectra due to Eu3+ ions in at least three different symmetry sites.

Download Full-text

IR luminescence of CaGa 2O 4 : Yb 3+ excited by 940 and 980 nm radiation

Modern Electronic Materials ◽

10.3897/j.moem.6.1.55165 ◽

2020 ◽

Vol 6 (1) ◽

pp. 31-36

Author(s):

Ul’ana A. Mar’ina ◽

Viktor A. Vorob’ev ◽

Alexandr P. Mar’in

Keyword(s):

Luminescence Intensity ◽

Level Structure ◽

Luminescent Properties ◽

Rare Earth Ions ◽

Luminescence Spectra ◽

Practical Implementation ◽

Luminescent Materials ◽

Solid State Method ◽

Region Data

Existing calcium gallate CaGa2O4 based luminescent materials radiating in visible IR region have been reviewed. IR luminophores have been studied but slightly but their practical implementation is of interest. CaGa2O4 specimens activated with Yb3+ rare-earth ions have been synthesized using the solid-state method. The structure and luminescent properties of CaGa2O4 : Yb3+ have been studied. CaGa2O4 : Yb3+ excitation with 940 and 980 nm radiation generates luminescence in the 980–1100 nm region. Data on the electron level structure in Yb3+ ions suggest that the excitation and luminescence occur directly in the Yb3+ ions with only a passive role of the base lattice. The luminescence spectra contain three peaks at 993, 1025 and 1080 nm. These luminescence peaks are caused by electron optical transitions from excited to main state in Yb3+ ions. 993 nm band luminescence intensity has been studied as a function of Yb3+ activator ions concentration. Introduction of Na+ ions into the luminophore increases IR luminescence intensity. Optimum (Ca1-x-yYbxNay)Ga2O4 luminophore composition has been suggested at which the 993 nm luminescence intensity is the highest.

Download Full-text

Thermoluminescence Enhancement of LiMgPO4 Crystal Host by Tb3+ and Tm3+ Trivalent Rare-Earth Ions Co-doping

Materials ◽

10.3390/ma12182861 ◽

2019 ◽

Vol 12 (18) ◽

pp. 2861 ◽

Cited By ~ 12

Author(s):

Wojciech Gieszczyk ◽

Barbara Marczewska ◽

Mariusz Kłosowski ◽

Anna Mrozik ◽

Paweł Bilski ◽

...

Keyword(s):

Rare Earth ◽

Low Temperature ◽

Luminescent Properties ◽

Rare Earth Ions ◽

Crystal Sample ◽

Temperature Range ◽

Co Doping ◽

Trivalent Rare Earth ◽

Recombination Centers ◽

Lower Temperature

We investigated the influence of terbium and thulium trivalent rare-earth (RE) ions co-doping on the luminescent properties enhancement of LiMgPO4 (LMP) crystal host. The studied crystals were grown from the melt by micro-pulling-down (MPD) technique. Luminescent properties of the obtained crystals were investigated by thermoluminescence (TL) method. The most favorable properties and the highest luminescence enhancement were measured for Tb and Tm double doped crystals. A similar luminescence level can be also obtained for Tm, B co-doped samples. In this case, however, the low-temperature TL components have a significant contribution. The measured luminescent spectra showed a typical emission of Tb3+ and Tm3+ ions of an opposite trapping nature, namely the holes and electron-trapping sites, respectively. The most prominent transitions of 5D4 → 7F3 (550 nm for Tb3+) and 1D2 → 3F4 (450 nm for Tm3+) were observed. It was also found that Tb3+ and Tm3+ emissions show temperature dependence in the case of double doped LMP crystal sample, which was not visible in the case of the samples doped with a single RE dopant. At a low temperature range (up to around 290 °C) Tm3+ emission was dominant. At higher temperatures, the electrons occupying Tm3+ sites started to be released giving rise to emissions from Tb-related recombination centers, and emissions from Tm3+ centers simultaneously decreased. At the highest temperatures, emission took place from Tb3+ recombination centers, but only from deeper 5D4 level-related traps which had not been emptied at a lower temperature range.

Download Full-text

Photoluminescence Properties of Eu3+ and Ce3+ Activated Calcium Chlorophosphate Via Combustion Synthesis Method

Oriental Journal of Physical Sciences ◽

10.13005/ojps01.0102.03 ◽

2016 ◽

Vol 1 (1-2) ◽

pp. 10-15

Author(s):

Nahida Baig ◽

N. S. Dhoble ◽

N. S. Kokode ◽

S. J. Dhoble

Keyword(s):

Rare Earth ◽

Combustion Synthesis ◽

Synthesis Method ◽

Ultra Violet ◽

Luminescent Properties ◽

Rare Earth Ions ◽

Excitation Spectra ◽

Pl Emission ◽

Narrow Bands ◽

Uv Range

Calcium chlorophosphate (Ca2PO4Cl) phosphors, activated by rare earth ions Eu3+ and Ce3+ were prepared by urea assisted combustion synthesis technique and their characterization and luminescent properties were studied. The synthesized phosphors were investigated by powdered XRD, SEM and Photoluminescence characterization (PL) methods. PL excitation spectra of Ca2PO4Cl:Eu3+/Ce3+ phosphor exhibit narrow bands in the near ultra violet (n-UV) range, and the PL emission spectra of Ca2PO4Cl: Eu3+/Ce3+ phosphor shows sharp narrow bands typical of rare earth ions. The bands observed in the PL emission and excitation spectra of Ca2PO4Cl: Eu3+/Ce3+ phosphors can be ascribed to the electronic transitions within 4f configurations of rare earth ions. The excitation peaks for Ca2PO4Cl: Eu3+ is in n-UV range. The obtained results suggest that these phosphors may be favorable for lamp industry.

Download Full-text

Structure, Luminescence, and Magnetic Properties of Crystalline Manganese Tungstate Doped with Rare Earth Ion

Materials ◽

10.3390/ma14133717 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3717

Author(s):

Jae-Young Jung ◽

Soung-Soo Yi ◽

Dong-Hyun Hwang ◽

Chang-Sik Son

Keyword(s):

Magnetic Field ◽

Rare Earth ◽

Sintering Temperature ◽

Luminescent Properties ◽

Concentration Quenching ◽

Rare Earth Ions ◽

Precipitation Method ◽

Rare Earth Ion ◽

Co Precipitation ◽

Quenching Phenomenon

The precursor prepared by co-precipitation method was sintered at various temperatures to synthesize crystalline manganese tungstate (MnWO4). Sintered MnWO4 showed the best crystallinity at a sintering temperature of 800 °C. Rare earth ion (Dysprosium; Dy3+) was added when preparing the precursor to enhance the magnetic and luminescent properties of crystalline MnWO4 based on these sintering temperature conditions. As the amount of rare earth ions was changed, the magnetic and luminescent characteristics were enhanced; however, after 0.1 mol.%, the luminescent characteristics decreased due to the concentration quenching phenomenon. In addition, a composite was prepared by mixing MnWO4 powder, with enhanced magnetism and luminescence properties due to the addition of dysprosium, with epoxy. To one of the two prepared composites a magnetic field was applied to induce alignment of the MnWO4 particles. Aligned particles showed stronger luminescence than the composite sample prepared with unsorted particles. As a result of this, it was suggested that it can be used as phosphor and a photosensitizer by utilizing the magnetic and luminescent properties of the synthesized MnWO4 powder with the addition of rare earth ions.

Download Full-text

Luminescent Properties of Rare Earth Ions in One-Dimensional Oxide Nanowires

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2005.318 ◽

2005 ◽

Vol 5 (9) ◽

pp. 1519-1531 ◽

Cited By ~ 10

Author(s):

Hongwei Song ◽

Lixin Yu ◽

LinMei Yang ◽

Shaozhe Lu

Keyword(s):

Rare Earth ◽

Luminescent Properties ◽

Rare Earth Ions ◽

Oxide Nanowires ◽

One Dimensional

Download Full-text

Kathodo- und Photolumineszenz der Seltenerd-aktivierten Wirtsgitter Ba2La2B2+Te2O12 (B = Zn, Mg)

Zeitschrift für Naturforschung A ◽

10.1515/zna-1986-0614 ◽

1986 ◽

Vol 41 (6) ◽

pp. 866-870 ◽

Cited By ~ 1

Author(s):

H.-D. Autenrieth ◽

S. Kemmler-Sack

Keyword(s):

Electronic Structure ◽

Rare Earth ◽

Visible Region ◽

Host Lattice ◽

Rare Earth Ions ◽

New Host ◽

Emission Efficiency ◽

Transfer Processes ◽

Trivalent Rare Earth ◽

Host Lattices

By activation of the new host lattices Ba2La2B2+Te2O12 (B = Zn, Mg) with trivalent rare earth ions Ln3+ = Pr. Sm, Eu, Tb, Dy, Ho, Tm an emission in the visible region is observed. The influence of the electronic structure and concentration on the relative emission efficiency as well as the host lattice participation in the energy transfer processes are discussed.

Download Full-text