scholarly journals Dosimetric and kinetic parameters of lithium cadmium borate glasses doped with rare earth ions

2014 ◽  
Vol 7 (4) ◽  
pp. 519-525 ◽  
Author(s):  
J. Anjaiah ◽  
C. Laxmikanth ◽  
P. Kistaiah ◽  
N. Veeraiah
Keyword(s):  
Rare Earth ◽  
Kinetic Parameters ◽  
Rare Earth Ions ◽  
Borate Glasses

scholarly journals Upconversion and Spectroscopic Properties of Rare Earth Codoped Lead Borate Glass Matrix

2017 ◽  
Vol 14 (2) ◽  
pp. 140-145 ◽  
Author(s):  
K. Goud ◽  
Ch. Ramesh ◽  
B. Appa Rao
Keyword(s):  
Rare Earth ◽  
Visible Region ◽  
Branching Ratio ◽  
Life Time ◽  
Rare Earth Ions ◽  
Borate Glasses ◽  
Energy Transfer Mechanism ◽  
Lead Borate ◽  
Ofelt Theory ◽  
Laser Materials

To develop efficient upconversion laser materials in the visible region an active lead borate glasses doped with Er3+/Yb3+ rare earth ions (GEY) has been studied extensively. In this investigation characterization techniques like Optical absorption, FTIR and photoluminescence were recorded and the data was analyzed. To evaluate the values of Ω2, Ω4 and Ω6 Judd-Ofelt theory has been applied to the f ↔ f transitions. Based on Judd–Ofelt theory branching ratio (βr) oscillator strength and the radiative life time (τR) values were determined. The upconversion spectra exhibited three emission bands at around 525 nm (2H11/2 ® 4I15/2), 545 nm (4S3/2 ® 4I15/2) and 660 nm (4F9/2 ® 4I15/2). The energy transfer mechanism between Yb3+ and Er3+ was discussed very clearly. Comparing the data obtained in other Er3+/Yb3+ doped materials, the lead bismuth gallium borate glasses doped with 0.6 mol% of Er2O3­/0.2 mol% of Yb2O3 ions are suitable materials for developing red upconversion lasers in the visible region.

The effect of Ce3+ ions on the spectral and decay characteristics of luminescence phosphate-borate glasses doped with rare-earth ions

2014 ◽  
Vol 116 (5) ◽  
pp. 677-682 ◽  
Author(s):  
D. T. Valiev ◽  
E. F. Polisadova ◽  
K. N. Belikov ◽  
N. L. Egorova
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Borate Glasses

Laser spectroscopy of rare earth ions in lead borate glasses and transparent glass-ceramics

Laser Physics ◽  
2010 ◽  
Vol 20 (3) ◽  
pp. 649-655 ◽  
Author(s):  
W. A. Pisarski ◽  
Ł. Grobelny ◽  
J. Pisarska ◽  
R. Lisiecki ◽  
G. Dominiak-Dzik ◽  
...  
Keyword(s):  
Rare Earth ◽  
Laser Spectroscopy ◽  
Glass Ceramics ◽  
Rare Earth Ions ◽  
Borate Glasses ◽  
Lead Borate ◽  
Transparent Glass ◽  
Lead Borate Glasses

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

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