Studying the properties of Gd2O3–WO3–CaO–SiO2–B2O3 glasses doped with Tb3+ (original) (raw)
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Luminescent properties of Tb3+- doped TeO2-WO3-GeO2 glasses for green laser applications
Optical Materials, 2018
Different concentrations of Tb 3+-doped oxyfluoro tellurite (TWGTb) glasses were prepared by conventional melt quenching technique and characterized for green laser applications. The Judd-Ofelt theory was applied to evaluate various spectroscopic and radiative parameters. The TWGTb glasses exhibit 5 D 3 → 7 F 5-3 and 5 D 4 → 7 F 6-0 transitions when excited at 316 nm radiation. The variation of intensity of 5 D 4 → 7 F 5 (Green) and 5 D 3 → 7 F 4 (Blue) transitions and the green to blue (I G /I B) intensity ratios were studied as a function of Tb 3+ ions concentration. The laser characteristic parameters such as effective bandwidth (Δλ eff), stimulated emission crosssection (σ e), gain bandwidth (σ e × Δλ eff) and optical gain (σ e × τ R) were determined using the three phenomenological Judd-Ofelt intensity parameters. The fluorescence decay profiles of 5 D 4 metastable level exhibit single-exponential nature for all the samples. Based on the experimental results we suggest that the 1.0 mol% of Tb 3+-doped TWGTb glass could be a suitable laser host material to emit intense green luminescence at 545 nm.
Optical properties of Sm 3+ -doped TeO 2 WO 3 GeO 2 glasses for solid state lasers
Physica B: Condensed Matter, 2018
Sm 3þ-doped oxyfluoride tellurite-tungsten (TWGSm) glasses were prepared by conventional melt quenching method. The optical properties were investigated through photoluminescence excitation, emission and luminescence decay analysis. The optical band gap energy was determined as~3.425 eV for 1.0 mol% of Sm 3þ-doped TWGSm glass. Upon 404 nm excitation, the TWGSm glasses emit luminescence through 4 G 5/2 → 6 H 5/2 (563 nm), 4 G 5/2 → 6 H 7/2 (600 nm), 4 G 5/2 → 6 H 9/2 (645 nm) and 4 G 5/2 → 6 H 11/2 (705 nm) transitions. The Judd-Ofelt analysis was performed using absorption spectrum and obtained radiative parameters were used to estimate the laser characteristics of present glasses. The concentration of Sm 3þ has been optimized as 1.0 mol% for efficient luminescence. The luminescence decay of 4 G 5/2 emission level was studied by monitoring the emission and excitation wavelengths at 600 and 404 nm, respectively. The experimental lifetime of 4 G 5/2 level was decrease with increase of Sm 3þ concentration. The 1.0 mol% of Sm 3þ-doped TWGSm glass could be the best choice for solid state visible lasers to emit orange luminescence.
Optical and luminescence characteristics of Sm3+ doped B2O3-GeO2-Gd2O3 glasses
Optical Materials, 2018
Glasses with the composition of 30B 2 O 3 e40GeO 2-(30-x)Gd 2 O 3-xSm 2 O 3 (x = 0.25, 0.5, 1 and 1.5 mol%) have been prepared by melt quenching technique. Their optical and luminescence properties were analyzed via absorption, photoluminescence and decay time measurements. Judd-Ofelt intensity parameters (Ω λ , λ = 2,4,6) obtained from the absorption spectrum follow the trend Ω 4 > Ω 2 > Ω 6. Photoluminescence spectra revealed a dominant emission band at 597 nm which was attributed to 4 G 5/2 → 6 H 7/2 transition. From the emission spectra and Judd-Ofelt intensity parameters radiative properties including transition probabilities (A), radiative decay times (τ R), branching ratio (β R) and stimulated emission cross-section (σ p E) were calculated. The decay curves of 4 G 5/2 level exhibited non-exponential behavior and well fitted to Inokuti-Hirayama model for S = 6. The analyzed spectroscopic properties viz. A, β R , σ p E and CIE chromaticity coordinates demonstrate the suitability of BGGS1.00 glass for visible reddish-orange laser applications among the prepared glasses.
Journal of Quantitative Spectroscopy and Radiative Transfer, 2014
Different glass matrices doped with Nd 3+ have been prepared by conventional melt quenching method with the molar compositions of (89-x) TeO 2 -10TiO 2 -1Nd 2 O 3 -xWO 3 (x = 0, 10 and 20 mol %). The XRD, FTIR, absorption spectra, photoluminescence (PL) spectra and luminescence decay curves of glass samples were measured at room temperature and investigated, respectively. The XRD pattern confirms the amorphous nature of the prepared glasses. The free OHcontent in the 1.0 mol% Nd 2 O 3 -doped glass samples has been estimated from their measured Infrared transmittance spectra. Judd-Ofelt (J-O) intensity parameters were derived from the absorption spectrum and used in turn to estimate radiative properties such as radiative transition probabilities (A T ), radiative lifetimes (τ r ) and branching ratios (β JJ' ) for 4 F 3/2 → 4 I 9/2 , 11/2, 13/2 transitions. From the emission spectra, peak wavelength, effective bandwidth (Δλ eff ) and stimulated emission cross-section (σ emis ) were calculated for the 4 F 3/2 → 4 I 11/2 transition. The values of the stimulated emission cross-section obtained in the present Nd 3+ -doped tellurite glasses are on the higher side than the values of the reported as well as commercial. The luminescence decay curves for the 4 F 3/2 → 4 I 11/2 transition have been measured to evaluate the quantum efficiency (η). The results show a significant increase of the quantum efficiency (η) with the increases of WO 3 concentration. Notably, it is found that the quantum efficiency in the TTNW 20 glass is much longer than that in most other glasses which indicates that this glass system could be considered as a good candidate for nearinfrared lasers at 1.06 μm.
Holmium doped Lead Tungsten Tellurite glasses for green luminescent applications
Lead Tungsten Tellurite (LTT) glasses doped with different concentrations of Ho 3 þ ions have been synthesized using the melt quenching method and characterized to understand their visible emission characteristic features using optical absorption and photoluminescence spectral studies. The Judd–Ofelt (JO) parameters measured from the absorption spectral features were used to evaluate radiative properties such as transition probability (A R), branching ratio (β R) and radiative lifetimes (τ R) for the prominent fluorescent levels of Ho 3 þ ions in LTT glasses. The photoluminescence spectra recorded for all the Ho 3 þ doped LTT glasses at an excitation wavelength 452 nm gives three prominent emission transitions 5 F 4-5 I 8 , 5 F 5-5 I 8 and 5 F 4-5 I 7 , of which 5 F 4-5 I 8 observed in visible green region (546 nm) is relatively more intense than the other two transitions. The intensity of 5 F 4-5 I 8 emission transition in these glasses increases up to 1 mol% of Ho 3 þ ions and beyond concentration quenching is observed. Branching ratios (β R) and emission cross-sections (s se) were evaluated for the intense emission transition 5 F 4-5 I 8 in these glasses to understand the luminescence efficiency in visible green region (546 nm). The CIE chromaticity coordinates were also evaluated in order to understand the suitability of these glasses for visible lumi-nescence. From the measured emission cross-sections and CIE coordinates, it was found that 1 mol% of Ho 3 þ ions in LTT glasses are most suitable for visible green luminescence in principle.
Lead Tungsten Tellurite (LTT) glasses doped with different concentrations of Tm 3 þ ions of composition (60 À x) TeO 2 þ25WO 3 þ15PbF 2 þ xTm 2 O 3 (Here x ¼0.1, 0.5, 1.0, 1.5, 2.0, 2.5 mol%) were prepared by using melt quenching technique and characterized through optical absorption, photoluminescence and decay spectral studies to know the feasibility of using these glasses as luminescent devices in visible Red and NIR regions. Judd–Ofelt (J–O) theory has been applied to the optical absorption spectral profiles to calculate the J–O intensity parameters Ω λ (λ ¼2, 4 and 6) and consecutively used to evaluate various radiative properties such as radiative transition probability (A R), radiative lifetimes (τ R) and branching ratios (β R) for the prominent luminescent levels. The luminescence spectra for all the LTT glass samples have two intense peaks in bright red and near Infrared regions at 650 nm (1 G 4-3 F 4) and 800 nm (3 H 4-3 H 6) respectively for which effective band widths (Δλ P), experimental branching ratios (β exp) and stimulated emission cross-sections (σ se) are evaluated. The decay profiles for all the glasses are recorded to measure the quantum efficiency by coupling the radiative with experimental lifetimes. From the measured emission cross-sections, quantum efficiency and CIE chromaticity coordinates , it was found that 0.5 mol% of Tm 3 þ ions doped LTT glass is most suitable for generating bright visible Red and NIR lasers to operate at 650 and 800 nm respectively.
Photoluminescence investigations on Sm3+ ions doped borate glasses for tricolor w-LEDs and lasers
Materials Research Bulletin, 2018
Logarthemic Intensity (arb. unit) Time (ms) Glass E Glass D S = 6 Glass C I-H Fitted Curves Logarthemic Intensity (arb. unit) Glass A Glass B Glass C Glass D Glass E Time (ms) Highlights Borate glasses with Sm 3+ ions were synthesized by melt quenching technique. Under 402nm excitation Borate glasses show reddish orange luminescence. Energy transfer through cross-relaxation leads to fall in decay time of Sm 3+ ions. I-H model confirms energy transfer between Sm 3+ ions as dipole-dipole in nature. 1mol% Sm 3+ ions in these glasses are apt for red photonic device applications.
Photoluminescence of Pr3+-, Nd3+- and Ni2+-doped TeO2–ZnO–WO3–TiO2–Na2O glasses
Journal of Alloys and Compounds, 2009
This paper report on the absorption and photoluminescence properties of Pr 3+ , Nd 3+ and Ni 2+ ions doped tellurite glasses. The X-ray diffraction (XRD) and differential scanning calorimetry (DSC) profiles of the host glass matrix have been carried out, to confirm its structure and thermal stability. From the measured absorption spectra, Judd-Ofelt (J-O) intensity parameters (˝2,˝4 and˝6) have been calculated for the rare-earth ions doped glasses and B, C, Dq parameters for transition metal ion-doped glass, respectively. The near infrared emission spectrum of Nd 3+ ions doped glass has shown full width at half maximum (FWHM) around 50 nm (for 4 F 3/2 → 4 I 9/2 transition), 50 nm (for 4 F 3/2 → 4 I 11/2 transition) and 70 nm (for 4 F 3/2 → 4 I 13/2 transition), respectively. Decay measurements were also carried out for Pr 3+ , Nd 3+ and Ni 2+ ions doped glasses. These glasses with better thermal stability and bright visible luminescence should have potential applications in optoelectronic materials and broadband amplifiers.
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.
A new-fangled series of Dy 3þ ions doped Single and Mixed Alkali Fluoro Tungsten Tellurite Glasses have been prepared by using melt quenching technique and their spectroscopic behaviour was investigated by using XRD, optical absorption, photoluminescence and lifetime measurements. The bonding parameter studies reveal the ionic nature of the DyeO bond in the present glasses. From the absorption spectra, the Judd-Ofelt (J-O) intensity parameters have been determined and in turn used to determine various radiative properties for the different emission transitions from the 4 F 9/2 fluorescent level. The photo-luminescence spectra of all the glasses exhibit two intensified peaks in blue and yellow regions corresponding to the transitions 4 F 9/2 / 6 H 15/2 (483 nm) and 4 F 9/2 / 6 H 13/2 (575 nm) respectively. From the photoluminescence spectra, it is observed that the luminescence intensity is maximum for Dy 3þ ion doped potassium combination of tungsten tellurite glass (TeWK:1Dy). The highest emission cross-section and branching ratio values observed for the 4 F 9/2 / 6 H 15/2 and 4 F 9/2 / 6 H 13/2 transitions suggest the possible laser action in the visible region from these glasses. By correlating the experimental lifetimes (t exp) measured from the decay spectral features with radiative lifetimes (t R), the quantum efficiencies (h) for all the glasses have been evaluated and found to be maximum for potassium combination tungsten tellurite (TeWK:1Dy) glass. The CIE colour chromaticity coordinates (x, y), (u, v), colour correlated temperature (CCT) and Y/B ratio were also estimated from the photoluminescence spectra for different compositions of glasses. The chromaticity colour coordinates evaluated for all the glasses fall within the white light region and white light emission can be tuned by varying the composition of the glass. From all these studies, it was concluded that 1 mol% of Dy 3þ ions doped TeWK glass is more suitable for lasing and white-LED applications.