Rare-Earth Ions in the Alkali Halides. I. Emission Spectra ofSm2+-Vacancy Complex

1964 ◽  
Vol 136 (5A) ◽  
pp. A1433-A1444 ◽  
Author(s):  
W. E. Bron ◽  
W. R. Heller
Keyword(s):  
Rare Earth ◽  
Emission Spectra ◽  
Alkali Halides ◽  
Rare Earth Ions ◽  
Vacancy Complex

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

ENHANCING EMISSION PROPERTIES OF RARE EARTH IONS IN CHALCOGENIDE GLASS VIA MINUTE COMPOSITIONAL ADJUSTMENTS

2010 ◽  
Vol 19 (04) ◽  
pp. 663-671 ◽  
Author(s):  
YONG GYU CHOI
Keyword(s):  
Rare Earth ◽  
Chalcogenide Glass ◽  
Alkali Halides ◽  
Rare Earth Ions ◽  
Emission Properties ◽  
Group Iii ◽  
Thermal Stability Of ◽  
Nonradiative Processes ◽  
Sulphide Glass

The significant role of the chemical environments of rare earths ions in controlling their radiative and nonradiative processes are exemplified in this study: The emission properties of rare earth ions ( Dy3+ or Tm3+ ) embedded in the strong covalent chalcogenide glass ( Ge and/or As containing sulphide glass) are dramatically enhanced upon the addition of very small amount of the Group III elements ( Ga or In ) and alkali halides ( CsBr or RbBr ). These compositional adjustments alter only the local structural environments of rare earth ions, while thermal stability of the modified glass is kept unaltered.

Luminescence of Er3+/Nd3+ Co-Doped Lithium Niobate Tellurite Glass

2016 ◽  
Vol 846 ◽  
pp. 131-136
Author(s):  
Nurhafizah Hasim ◽  
Md Supar Rohani ◽  
Md Rahim Sahar ◽  
Sib Krishna Ghoshal
Keyword(s):  
Rare Earth ◽  
Lithium Niobate ◽  
Excited States ◽  
Ground State ◽  
Emission Spectra ◽  
Green Emission ◽  
Volume Density ◽  
Rare Earth Ions ◽  
Luminescence Spectra ◽  
Co Doped

Achieving tuneable photoluminescence via controlled co-doping of rare earth ions in lithium niobate based glasses are challenging. A series of Er3+/ Nd3+ co-doped tellurite glasses of composition (70-x-y) TeO2 – 15 Li2CO3 – 15 Nb2O5 – (x) Er2O3 – (y) Nd2O3 with x = 0; 1.0 mol % and 0 ≤ y ≤ 1.0 mol % are prepared using melt quenching technique. The influence of co-dopants on the emission properties is analyzed and discussed using partial energy level diagram of rare earth ions. The dopants concentration dependent physical properties such as refractive index, molar volume, density, polarizability and molar refractions are determined. The down-converted luminescence spectra for 2G9/2 à4I9/2 transition reveal a strong green emission band centred at 497 nm is attributed to the energy transfer from erbium to neodymium ion. The emission spectra exhibit five prominent peaks centred at 497, 539, 553, 616 and 634 nm corresponding to the transitions from 2H11/2, 4S3/2 and 4F9/2 excited states to the ground state of Er3+ ion and the transitions from 2G9/2, 2G7/2, 2H11/2 and 4F9/2 excited states to ground state of Nd3+ ion. The highest intensity is achieved for x = y = 1.0 mol%. The excellent luminescence response suggests that our glasses may be nominated for solid state lasers and other photonic applications.

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.

Effect of Sm3+ Concentration on the Vibrational and Luminescent Properties of LaPO4

2016 ◽  
Vol 848 ◽  
pp. 482-488 ◽  
Author(s):  
Zhong Ju Zhang ◽  
Xu Dong Zheng ◽  
Zhi Cheng Shi ◽  
Xin Wang
Keyword(s):  
Raman Spectroscopy ◽  
Rare Earth ◽  
Raman Band ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Rare Earth Ions ◽  
Luminescence Spectroscopy ◽  
Hydrothermal Route ◽  
High Quantum ◽  
Ftir And Raman Spectroscopy

Lanthanum orthophosphate (LaPO4) is a useful host for doping rare earth ions with high quantum efficiencies. In the present investigation the monoclinic LaPO4 and LaPO4:Sm3+ were synthesized via hydrothermal route. SEM, XRD, FTIR and Raman spectroscopy as well as the luminescence spectroscopy were utilized to character the samples of the Sm3+-doped LaPO4. The results indicated that the lattice parameters decreased linearly with Sm3+ concentration, and general linear hypsochromic shifts regarding Sm3+ concentration were observed in infrared spectroscopic wavenumbers and Raman band positions. The emission spectra showed that Sm3+ ions were in more non-centrosymmetric environment when Sm3+ concentration increased.

Accidental formation of Gd4(SiO4)2OTe: crystal structure and spectroscopic properties

2015 ◽  
Vol 71 (7) ◽  
pp. 598-601 ◽  
Author(s):  
Marek Daszkiewicz ◽  
Lubomir D. Gulay
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Room Temperature ◽  
Emission Spectra ◽  
Functional Materials ◽  
Spectroscopic Properties ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Interest In Science

Designing new functional materials with increasingly complex compositions is of current interest in science and technology. Complex rare-earth-based chalcogenides have specific thermal, electrical, magnetic and optical properties. Tetragadolinium bis[tetraoxidosilicate(IV)] oxide telluride, Gd4(SiO4)2OTe, was obtained accidentally while studying the Gd2Te3–Cu2Te system. The crystal structure was determined by means of single-crystal X-ray diffraction. The compound crystallizes in the space groupPnma. Three symmetry-independent gadolinium sites were determined. The excitation and emission spectra were collected at room temperature and at 10 K. Gd4(SiO4)2OTe appears to be a promising optical material when doped with rare-earth ions.

Sign in / Sign up

Export Citation Format

Share Document