Luminescence properties of Pr 3 þ doped Li 2 O-MO-B 2 O 3 glasses (original) (raw)
Related papers
Thermoluminescence Studies on Li 2 O-MO-B 2 O 3 Glasses Doped with Rare Earth Ions
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with four different rare earth ions (viz., Pr 3+ , Nd 3+ , Sm 3+ and Eu 3+) lithium borate glasses mixed with the three different modifiers ZnO, CaO and CdO have been studied in 303-573 K. All the pure glasses have exhibited single thermoluminescence peak at 382, 424 and 466 K, respectively. When these glasses are doped with different rare earth ions no additional peaks are observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of thermoluminescence light output. The area under the glow curve is also found to be maximum for Eu 3+ doped glasses. The glasses containing CdO as modifier have exhibited the maximum thermoluminescence light output. The trap depth parameters associated with the observed thermoluminescence peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described.
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with Pr 3+ ions Li 2 O-MOB 2 O 3 (where MO=ZnO, CaO, CdO) glasses have been studied in the temperature range 303-573K; all the pure glasses have exhibited single TL peak at 382K, 424K and 466 K respectively. When these glasses are doped with Pr 3+ ions no additional peaks are observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of TL light output. The area under the glow curve is found to be maximum for Pr 3+ doped glasses mixed with cadmium oxide as modifier. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described. The result clearly showed that praseodymium doped cadmium borate glass has a potential to be considered as the thermoluminescence dosimeter.
Infrared luminescence and thermoluminescence of lithium borate glasses doped with Sm 3+ ions
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with Sm 3+ ions Li 2 O-MOB 2 O 3 (where MO=ZnO, CaO, CdO) glasses have been studied in the temperature range of 303 to 573 K. All the pure glasses exhibited single TL peaks at 382 K, 424 K and 466 K. When these glasses were doped with Sm 3+ ions no additional peaks have been observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of TL light output. The area under the glow curve was found to be maximum for Sm 3+ doped glasses mixed with cadmium oxide as a modifier. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described. The results clearly showed that samarium doped cadmium borate glass has a potential to be considered as a thermoluminescence dosimeter.
Spectroscopic properties and luminescence behaviour of europium doped lithium borate glasses
Li 2 O-MOB 2 O 3 (MO¼ ZnO, CaO and CdO) glasses doped with europium are prepared by using the melt quenching technique to study their absorption and luminescence properties to understand their lasing potentialities. The XRD pattern of the glasses confirmed the amorphous nature and the IR spectra reveal the presence of BO 3 and BO 4 units in the glass network. Judd-Ofelt intensity parameters Ω λ (λ ¼2, 4, 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. The J-O parameters have been used to calculate transition probabilities (A), lifetime (τ R), branching ratios (β R) and stimulated emission cross-section ðσ P) for the 5 D 0-7 F J (J ¼ 1-4) transitions of the Eu 3 þ ions. The decay from the 5 D 0 level of Eu 3 þ ions in these glasses has been measured and analysed. Branching ratios and stimulated emission cross-sections measured for all these glasses show that the 5 D 0-7 F 1 transition under investigation has the potential for laser applications. The high stimulated emission cross-section and branching ratios from the present glasses suggests their potential for infra red lasers. The study of the thermoluminescence is also carried out and the data suggests that the CdBEu glass is suitable for thermoluminescence emission output among the three Eu 3 þ doped glasses.
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with four different rare earth ions (viz., Pr3+, Nd3+, Sm3+ and Eu3+) Li2O-Cao-B2O3 glasses have been studied in the temperature range 303-573K; the pure glass has exhibited single TL peak at 424K. When this glass is doped with different rare earth ions no additional peaks are observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of TL light output. The area under the glow curve is found to be maximum for Eu3+ doped glasses. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described. The result clearly showed that europium doped calcium borate glass has a potential to be considered as the thermoluminescence dosimeter.
Structural and optical properties of Sm3+-doped borate glasses for luminescent applications
Optical and Quantum Electronics, 2019
In this work, most interesting optical investigations are carried out with the glass composition (20 − x) CdCO 3 + 15 Li 2 CO 3 + 15 Na 2 CO 3 + 50 H 3 BO 3 + xSm 2 O 3 (where x = 0.1, 0.5, 1.0, 3.0, 4.0 and 5.0 mol%) prepared with conservative melt-quenching technique. DSC verifies the annealing temperature and thermal stability of the prepared glass. X-ray diffraction technique is employed to inspect the amorphous structure of the glasses. FTIR technique helps to view the vibrational band positions of the host material. For optical studies, optical absorption and emission measurements are used. From the absorption spectra, Judd-Ofelt (JO) parameters (Ω 2 , Ω 4 , Ω 6), rms value of oscillator strength (rms), nephelauxetic parameter (̄), bonding parameter () and optical band gaps are evaluated. Radiative properties such as radiative transition probabilities (A T), branching ratios (β cal , β exp) and stimulated emission cross section (σ emi) are calculated using JO theory. The higher stimulated emission cross section (14.39 × 10 −22 cm 2), optical gain (36.69 × 10 −25 cm 2 s) indicate that 1.0 mol% of Sm 3+-doped borate glass would be a potential gain medium for solid state laser application at 603 nm. Color coordinates of the glasses located in the reddish-orange region could be useful for white light-emitting application.
Thermoluminescence properties of lithium magnesium borate glasses system doped with dysprosium oxide
Luminescence : the journal of biological and chemical luminescence, 2015
We report the impact of dysprosium (Dy(3+) ) dopant and magnesium oxide (MgO) modifier on the thermoluminescent properties of lithium borate (LB) glass via two procedures. The thermoluminescence (TL) glow curves reveal a single prominent peak at 190 °C for 0.5 mol% of Dy(3+) . An increase in MgO contents by 10 mol% enhances the TL intensity by a factor of 1.5 times without causing any shift in the maximum temperature. This enhancement is attributed to the occurrence of extra electron traps created via magnesium and the energy transfer to trivalent Dy(3+) ions. Good linearity in the range of 0.01-4 Gy with a linear correlation coefficient of 0.998, fading as low as 21% over a period of 3 months, excellent reproducibility without oven annealing and tissue equivalent effective atomic numbers ~8.71 are achieved. The trap parameters, including geometric factor (μg ), activation energy (E) and frequency factor (s) associated with LMB:Dy are also determined. These favorable TL characterist...
Journal of Alloys and Compounds, 2011
Glasses having composition 20ZnO•xBi 2 O 3 •(79.5 − x)B 2 O 3 •0.5Pr 6 O 11 were prepared by melt quench technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. The spectroscopic properties of these glasses were investigated by recording optical absorption and fluorescence spectra. The structural investigations of the glasses were carried out by recording the IR spectra. The optical properties of Pr 3+ ions doped zinc borate glasses with varying concentration of bismuth oxide have been studied. The Judd-Ofelt intensity parameters˝ (= 2, 4, 6) and other radiative properties like radiative transition probability, radiative life time, branching ratio and stimulated emission crosssection of the prepared glasses have been calculated. The variation of˝2 with Bi 2 O 3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in their rare earth oxygen (RE-O) covalency. The branching ratio for 3 P 0 → 3 F 2 transition is 42% and the predicted spontaneous radiative transition probability rates are fairly high (14,347-14,607 s −1). This is beneficial for lasing emission. The stimulated emission cross-section for all the emission bands has been calculated.
Spectroscopic Properties of Er3+ Doped Zinc Lithium Bismuth Borate Glasses
IOSR Journal of Applied Physics, 2016
Zinc lithium bismuth borate glasses containing Er 3+ in (25-x): Bi 2 O 3 :20Li 2 O:20ZnO: 35B 2 O 3 :xEr 2 O 3 (where x=1, 1.5,2 mol %) have been prepared by melt-quenching method. The amorphous nature of the glasses was confirmed by x-ray diffraction studies. Optical absorption and fluorescence spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters Ω λ (λ=2, 4, 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. Using these intensity parameters various radiative properties like spontaneous emission probability, branching ratio, radiative life time and stimulated emission cross-section of various emission lines have been evaluated.