Evidence of Dopant-Matrix Interaction in Optical Spectra of Rare Earth Ions

2005 ◽  
Vol 494 ◽  
pp. 253-258
Author(s):  
E. Antić-Fidančev
Keyword(s):  
Rare Earth ◽  
Emission Spectra ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Line Broadening ◽  
High Concentration ◽  
Ionic Radii ◽  
Crystal Field Strength ◽  
Local Perturbations ◽  
Solid Media

Complex emission spectra of europium doped rare earth calcium oxoborates, EuCa4O(BO3)3 - EuCOB, and GdCa4O(BO3)3: Eu3+- GdCOB: Eu3+, were finely analyzed for better understanding of some local perturbations detected in these solid media. Highlighting a “size effect” of dopant / matrix ions, the interaction between the host lattice and the embedded ion is demonstrated. The evolution of the crystal field strength of R3+ ions along the rare earth series is presented for C-type RE2O3 oxides. According to R3+ - RE3+ ionic radii difference (R3+ for a dopant ion and RE3+ for a matrix ion), two opposite standings are evidenced along a series. Effect of high concentration doping on spectral line broadening is illustrated following a half-height width of 2P1/2 level of Nd3+ ion in A-type La2O3 oxide.

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

1986 ◽  
Vol 41 (6) ◽  
pp. 866-870 ◽  
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.

Tunable emissions via the white region from Sr2Gd8(SiO4)6O2:RE3+ (RE3+: Dy3+, Tm3+, Eu3+) phosphors

2016 ◽  
Vol 40 (7) ◽  
pp. 6214-6227 ◽  
Author(s):  
Gattupalli Manikya Rao ◽  
G. Seeta Rama Raju ◽  
Sk. Khaja Hussain ◽  
E. Pavitra ◽  
P. S. V. Subba Rao ◽  
...  
Keyword(s):  
Rare Earth ◽  
White Light ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
White Region ◽  
Light Region ◽  
Trivalent Rare Earth ◽  
Co Doped

Sr2Gd8(SiO4)6O2 is an excellent host lattice for tunable emissions via the white-light region when co-doped with suitable trivalent rare-earth ions.

Kathodolumineszenz der Seltenerd-aktivierten Wirtsgitter Sr3La2W2O12 und Ca2La0,5Na0,5WO6

1985 ◽  
Vol 40 (5) ◽  
pp. 503-507 ◽  
Author(s):  
R. Braun ◽  
R. Otto ◽  
W. Wischert ◽  
S. Kemmler-Sack
Keyword(s):  
Electronic Structure ◽  
Energy Transfer ◽  
Rare Earth ◽  
Visible Region ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Emission Efficiency ◽  
Transfer Processes ◽  
Trivalent Rare Earth ◽  
Host Lattices

By activation of the host lattices Sr3La2W2O12 and Ca2La0,5Na0,5WO6 with the trivalent rare earth ions Ln3+ = Pr, Sm, Eu, Tb, Dy, Ho, Er a cathodoluminescence in the visible region is obtained. The influence of the electronic structure and concentration of the activator on the relative emission efficiency as well as the host lattice participation in the energy transfer processes are discussed.

Optimization of Rare Earth Dope on MAl2O4 (M = Ba, Sr) by Self-Propagating High Temperature Synthesis

2012 ◽  
Vol 488-489 ◽  
pp. 442-446 ◽  
Author(s):  
Taschaporn Sathaporn ◽  
Sutham Niyomwas
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Broad Band ◽  
Emission Spectra ◽  
Rare Earth Ions ◽  
Ocean Optics ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Microscope Technique

The Eu2+ doped barium aluminate (BaAl2O4:Eu2+) and strontium aluminate (SrAl2O4:Eu2+) with high brightness were synthesized by self-propagating high temperature synthesis (SHS) method. The influence of doping rare earth ions (Eu2+) on the luminescence of MAl2O4:Eu2+ were described in this study. The reactions were carried out in a SHS reactor under static argon gas at a pressure of 0.5 MPa. The morphologies and the phase structures of the products have been characterized by X-ray diffraction (XRD) and scanning electron microscope technique (SEM). The emission spectra of the products have been measured by an Ocean optics spectrometer at room temperature. Broad band UV excited luminescence was observed for BaAl2O4:Eu2+ and SrAl2O4:Eu2+ in the green region peak at λmax = 501 nm and 523 nm, respectively. The optimum Eu2+ doping ratio were 10.5 mol% and 6 mol% for BaAl2O4:Eu2+ and SrAl2O4:Eu2+, respectively

Persistence Mechanisms and Applications of Long Afterglow Phosphors

2015 ◽  
Vol 361 ◽  
pp. 69-94
Author(s):  
V. Shanker ◽  
D. Haranath ◽  
G. Swati
Keyword(s):  
Rare Earth ◽  
Visible Spectrum ◽  
Special Kind ◽  
Processing Parameters ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Energy Storage And Conversion ◽  
Slight Variation ◽  
Long Afterglow ◽  
Luminescence Efficiency

This article presents a broad review of long persistence (LP) materials that are a special kind of photon energy storage and conversion materials. They are also known as long afterglow phosphors or long decay phosphors (LDP). These phosphors can be readily excited by any ordinary household lamp, sunlight and/or ambient room lights and glow continuously in the dark for hours together without involving any radioactive elements. It is the modifications that are made to crystalline host lattice that exhibit these unusual properties related to persistence due to effective doping of some transition or rare-earth ions. A slight variation in the processing parameters such as type of reducing atmosphere, stoichiometric excess of one or more constituents, the nature of fluxes, and the intentional addition of carbon or rare-earth halides can drastically shift the emission colors and persistence times of the LP phosphors in the visible spectrum. Historically, Cu-doped ZnS phosphor had been a traditional LP material with its afterglow time less than an hour. The emission color of these LP phosphors was confined between green and yellow-green region only. However, synthesis of blue and red-emitting phosphors with long persistence times had been always a challenging task. This review article covers the recent advances in the blue, green and red-emitting LP phosphors/nanophosphors, persistence mechanism involved and the basic problems associated with their luminescence efficiency and persistence times. Modifications to existing nanosynthesis protocols to formulate a nontoxic Green Chemistry Route are also presented.Contents of Paper1. Long Afterglow Phosphors

Phosphate glass core/silica clad fibres with a high concentration of active rare-earth ions

2016 ◽  
Vol 46 (12) ◽  
pp. 1071-1076
Author(s):  
O N Egorova ◽  
B I Galagan ◽  
B I Denker ◽  
S E Sverchkov ◽  
S L Semjonov
Keyword(s):  
Rare Earth ◽  
Phosphate Glass ◽  
Rare Earth Ions ◽  
High Concentration

Photolumineszenz und Energietransfer in Seltenerd-aktivierten Granat Gd3Te2Li3O12 / Photolwninescence and Energy Transfer in the Rare Earth Activated Garnet Gd3Te2Li3O12

1984 ◽  
Vol 39 (5) ◽  
pp. 490-494 ◽  
Author(s):  
B. Köngeter ◽  
S. Kemmler-Sack
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Visible Emission ◽  
Luminescence Properties ◽  
Trivalent Rare Earth ◽  
The Rare Earth

By activation of the cubic garnet host lattice Gd3Te2Li3O12 with trivalent rare earth ions the most intense visible emission is observed for Ln3+ = Eu, Tb. Energy transfer from Gd3+ to Sm3+, Eu3+ or Dy3+, from Tb3+ to Eu3+ and from Er3+ to Tm3+ has been found to occur. The luminescence properties are strongly influenced by the substitution of Te6+ by W6+ (systems Gd3-xLnxTe2-yWyLi3O12)

Preparation and tunable luminescence of CaCO3:Eu3+,Dy3+ phosphors

2014 ◽  
Vol 07 (04) ◽  
pp. 1450038 ◽  
Author(s):  
Yanwei Dong ◽  
Ming Kang ◽  
Ping Zhang ◽  
Qijun Cheng ◽  
Jie Wang
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Host Lattice ◽  
Rare Earth Ions ◽  
Precipitation Method ◽  
Scanning Calorimetry ◽  
Chromaticity Coordinates ◽  
Co Precipitation ◽  
Co Doped ◽  
The Rare Earth

Phosphors based on calcium carbonate, co-doped with various Eu 3+ and Dy 3+ concentrations were prepared by microwave co-precipitation method. The prepared phosphors were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry and differential scanning calorimetry (TG-DSC) and photoluminescence and photoluminescence excitation (PL-PLE) spectroscopy. Results showed that Dy 3+ and Eu 3+ ions were uniformly introduced into the host lattice of CaCO 3 taking the place of Ca 2+ ions. Under the excitation at 382 nm, the emission peak wavelengths were at 487 nm (4 F 9/2 → 6 H 15/2 of Dy 3+), 576 nm (4 F 9/2 → 6 H 13/2 of Dy 3+), and 614 nm (5 D 0 → 7 F 2 of Eu 3+). The luminescent intensities and emitting colors of Eu 3+- Dy 3+ co-doped CaCO 3 phosphors could be controlled by UV–violet excitations wavelengths or the rare-earth ions concentrations of Eu 3+ and Dy 3+ in phosphors. The chromaticity coordinates and photographs of samples under UV light showed the changes of the luminescence color intuitively through the varing UV–violet excitations wavelengths or the rare-earth ions concentrations of Eu 3+ and Dy 3+.

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