Bismuth Borosilicate Glasses Research Articles

Impact of Bi2O3 on prepared nano (SiO2-Na2O-CaO-B2O3) glass as radiation shielding material

Melt quenching technique was used to create Bismuth Boro-Silicate nano glasses with compositions of 45SiO2-10CaO- 25Na2O- xBi2O3- (20-x) B2O3 (where x is 0, 5, 10, 15, and 20 mol %). Standard point sources AM-241, Ba-133, Co-60, Cs-137, and Eu-152 were used in the radiation experiment to evaluate the attenuation coefficients spanning the energy range of 59.51 keV to 1048.01 keV. The findings show that adding Bi2O3 in place of B2O3 increases the following: radiation protection efficiency (RPE%), transmission factor (TF%), absorption buildup factor values (ABF), exposure buildup factor values (EBF), mass attenuation coefficients (MACs), linear attenuation coefficients (LACs), and radiation protection efficiency (RPE%). In comparison to lead glass, these findings demonstrate the potential of nano Bismuth Boro-Silicate glass as a radiation shielding material.

Preparation and radiation shielding features of high density, transparent borosilicate glasses with different Bi2O3 contents

This work assessed highly effective bismuth borosilicate glasses' nuclear radiation shielding capabilities in terms of different concentrations of Bi2O3. Melt-quenching was the method used to create the glasses. The Phy-X/PSD program was used to compute the μm values. The bismuth borosilicate glasses' nuclear radiation shielding properties were determined in the 0.015–15 MeV energy range. Increasing Bi₂O₃ concentration resulted in an increase in mass attenuation coefficient, linear attenuation coefficient, and effective atomic number. Conversely, the half value layer and mean free path values decreased. The B48Bi17 sample, with its largest Zeff, is a great gamma attenuator. The results of a new study may help to clarify the nature of the Bi2O3 additive used in borosilicate glasses, which are a potential form of shield for use in industrial and medical radiation facilities.

Unveiling the structural, optical, and electromagnetic attenuation characteristics of B2O3–SiO2–CaO–Bi2O3 glasses with varied WO3 content

This study provides insight into B2O3–SiO2–CaO–Bi2O3 glasses where novel results for the effects of WO3 content on its structural and optical properties have been demonstrated. Thus, provides useful data for developing new glasses for optical and electromagnetic shielding applications. The effect of WO3 content on the structural and optical properties of B2O3–SiO2–CaO–Bi2O3 glasses was investigated along with radiation shielding features which have been calculated by XCOM program. BSCB/W-00, BSCB/W-2.5, BSCB/W-5.0, BSCB/W-7.5, BSCB/W-10, BSCB/W-15, and BSCB/W-20 refer to seven samples of bismuth borosilicate glass system doped with 0.0, 2.5, 5, 7.5, 10, 15, and 20% of WO3, respectively, synthesized using the melt quenching technique. The density of the glasses decreased with increasing WO3 content due to the replacement of Bi2O3 with lower-density WO3. It was found that the absorption coefficient decreased with increasing WO3 content up to 10 wt%, but showed an opposite trend for samples with higher WO3 content. The optical band gap and the transition type were affected as the WO3 content increased. The electromagnetic wave decay or skin depth was also calculated. Overall, the shielding effectiveness of investigated samples BSCB/W-00, BSCB/W-2.5, BSCB/W-5.0, BSCB/W-7.5, BSCB/W-10, BSCB/W-15, and BSCB/W-20 has reduced with the enlargement of the WO3 concentration. BSCB/W-00, out of all the samples tested, has the highest shielding efficiency.

Influence of B2O3/Bi2O3 on the radiation absorption and nuclear safety of bismuth borosilicate glass system

In the quest to probe the potential of (40-x)B2O3–39SiO2–(20+x)Bi2O3–1Dy2O3 (BSBD1 –BSBD4) glasses, their interaction parameter with multispectral radiation is calculated, analyzed and presented in this report. The FLUKA code was used to simulate photons, charged particles (electrons, protons, α-particle, and carbon ions), and slow neutron cross sections of the glasses. In addition, the fissile and thermal neutron attenuation cross sections were evaluated through analytic expressions. The mass attenuation coefficient of the BSBD glasses varied from 0.0364 cm2/g to 68.9445 cm2/g for BSBD1, 0.0382 cm2/g to 80.1942 cm2/g for BSBD2, 0.0392 cm2/g to 87.5237 cm2/g for BSBD3, and 0.04001 cm2/g to 92.6780 cm2/g for BSBD4. Other photon attenuation parameters showed that the BSBD4 glass is the best photon attenuator. The range and stopping power of the charged particles also revealed that charged particle attenuation depends strongly on the density and Bi2O3 quantity. The neutron absorbing/shielding ability of the glasses showed a contrasting trend compared to photons and charged particles. While BSBD2 was the best fast neutron absorber, BSBD1 on the other hand, showed greater resilience to thermal and slow neutrons. Based on the analyzed data analyzed in this study, the BSBD glasses showed great potential for radiation protection ability.

Red light component tuning by n-UV/blue light excitations in Sm3+/Eu3+ co-doped Y2O3–Al2O3–Bi2O3–B2O3–SiO2 glasses for W-LED applications

A series of single (Sm3+, Eu3+) and co-doped (Sm3+- Eu3+) Yttrium alumino bismuth borosilicate (YABiBS) glasses have been prepared by basic melting quench method and the emission properties of synthesized glasses were investigated. To analyze the optical and energy transfer mechanism of these glasses the characterizations viz, absorption and luminescence are done. The absorption spectral data is used to observe the electronic band structure by direct and indirect optical band gaps. Bonding Parameters (β‾,δ) were evaluated to explain the ionic (or) covalent nature of the metal-ligand bonds in the present glass network. Near ultraviolet (n-UV) and blue excitations such as 392 nm, 400 nm, 457 nm, and 488 nm are used to record the emissions of single (Sm3+) and co-doped (Sm3+-Eu3+) glasses to achieve the tuneable emissions. Sm3+ ions show the reddish-orange emission mainly through 4G5/2 → 6H7/2 (597 nm) and Eu3+ ions show the intense red emission of transition 5D0 → 7F2 (612 nm). For the Sm3+-Eu3+ glasses by using different excitations, we will achieve the emission changes from orange to reddish-orange and then to red. Decay curves were analysed to know the process of interaction involved in the energy transfer among co-doped RE3+ ions. CIE coordinates and CCT values for all the prepared glasses by various excitations were calculated.

TeO2 for enhancing structural, mechanical, optical, gamma and neutron radiation shielding performance of bismuth borosilicate glasses

The synthesized 12Bi2O3– 8BaO–12ZnO-0.5CeO2-17.5SiO2- (50-x) B2O3- xTeO2 glasses with x = 0, 10, 20, 30 and 40 mol% (coded BiTe-0 to BiTe-40) were investigated in terms of physical, structural, optical and mechanical properties to examine the influence of CeO2 and TeO2 on the heavy metal oxide (HMO) borosilicate network. Density values increased continuously with increasing TeO2 concentration with BiTe-40 glass exhibiting maximum value of 5.0875 gcm−3. This property helped in enhancement of refractive index values from 1.769 for BiTe-0 to 1.942 for BiTe-40. Fourier transform infrared (FTIR) analysis of studied glasses revealed the presence of additional small peak at 683 cm−1 in BiTe-30 and BiTe-40 which confirmed the formation of stable TeO4 units in the glass network. The deep brown colour of the glass existing due to bismuth's presence was nullified by CeO2 and TeO2 additives which improved transparency of the glass. Urbach analysis of these glasses led to optical bandgap variation between 3.27 eV and 2.73 eV for 0–40 mol% TeO2 concentration. Makishima and Mackenzie model was utilized for evaluation of elastic property of the glasses, and Poisson's ratio ranging between 1.935 and 1.953 was obtained. Vickers micro-indentation test on the current glasses revealed decreasing microhardness from 4.116 to 4.076 GPa with TeO2 variation from 0 to 40 mol% at 9.8 N load. Gamma radiation shielding parameters were determined using Phy-X/PSD software and it was found that BiTe-40 glass produce maximum MAC (mass attenuation co-efficient) values in high photon energy region 3.5–15 MeV. The present article also contains a detailed emphasis on behaviour of gamma radiation build-up factors at different incident photon energy and TeO2 concentration. The increasing trend of exposure build up factor (EBF) was seen with increasing penetration depth inside the samples at all energies, indicating that glasses of larger thickness improve the escape probability of photons. Meanwhile, fast neutron removal cross-section (FNRCS) was highest for BiTe-10 sample (0.10118 cm−1) which also surpassed the value of ordinary concrete (0.093 cm−1). Overall, the present glass system bested other conventional shields available commercially in terms of gamma and neutron radiation shielding effectiveness.

TeO2–SiO2–B2O3 glasses doped with CeO2 for gamma radiation shielding and dosimetry application

Bismuth borosilicate glasses doped with 0.5 mol% of CeO2 and increasing concentration of TeO2 (0–40 mol%) are synthesized by melt quench method with 12500C melting temperature, then coded as BiTe glasses. Theoretical values of parameters related gamma radiation shielding such as linear attenuation coefficient (LAC) and mean free path (MFP) are determined from Phy-X/PSD software in the radiation energy range of 0.015–15 MeV. We have achieved greater density value of around 5 gcm−3 and highest set of LAC values 314–0.2 cm−1 for BiTe-40 glass along with lowest range 0.002–3.8 cm of HVL thickness. On gamma irradiation, there was a notable enhancement in thermoluminescence (TL) intensity for TeO2 content greater than 30 mol% due to increase in density of trap centres. CeO2 incorporation has also contributed to increasing density of trap centres. The kinetic parameters were evaluated with the help of glow curve deconvolution technique from which the calculated activation energy was highest (1.652 eV) for BiTe-40 glass with longer lifetime (6.34 × 106 years) of charges trapped in high temperature region of 559 K.

Effective Anti-Oxidation Repair Coating for C/C Brake Materials Comprising Lead-Borosilicate and Bismuth-Borosilicate Glass

To achieve effective antioxidation of on-site repair coating for C/C brake materials in the full temperature range (500–900 °C), lead glass and bismuth glass were introduced into the borosilicate glass to acquire the protective coatings. Before preparing coating samples, the thermal gravity characteristics of the lead/bismuth–borosilicate glass powders were analyzed by TG/DSC. The results revealed that the temperature at which weight gain begins was 495 °C and 545 °C, respectively. The oxidation behaviors of the lead- and bismuth-modified borosilicate glass coatings were compared at 500 °C, and the antioxidation properties of the former were further examined from 500 to 900 °C. The oxidation results indicated that mixing lead glass with borosilicate glass realized effective oxidation resistance in the full temperature range. With a lead content of 20%, the lead–borosilicate glass coating was able to protect C/C substrates from oxidation. The corresponding weight loss of the lead-glass-coated samples was −1.89% when oxidized at 500 °C for 10 h, while the weight loss was −2.55% when further oxidized at 900 °C for 10 h. However, mixing bismuth glass with borosilicate glass was difficult to achieve the oxidation resistance of the coating at 500 °C due to the significant phase separation.

Enhanced photoluminescence in Dy3+/Au co-doped bismuth borosilicate glass

Several optical applications demand for enhanced optical response of rare earth containing glasses. In the present investigation, modification in spectral features with the dispersion of gold nanoparticles in Dy3+ doped bismuth borosilicate glasses is reported. All the glass samples were prepared using conventional melt-quench technique. Prepared glasses were characterised using Fourier transform infrared spectroscopy (FTIR), dilatometery, field emission scanning electron microscopy (FESEM), Uv–Vis–NIR spectroscopy and photoluminescence. Thermal studies carried out using dilatometer confirms the decrease in glass transition after co-doping of gold nanoparticles and Dy3+. Field emission scanning electron microscopy revealed the existence of gold nanoparticles inside the glassy matrix. A marginal change in the values of Judd-Ofelt parameters of glasses is observed after the incorporation of gold nanoparticles. Significant enhancement in emission intensities is observed after the addition of gold nano-particles. The high stimulated emission cross-section (σemi) and radiative transition probability values for prepared glasses confirms their suitability for the fabrication of yellow light laser.

Impact of bismuth concentration on the fluorescence properties of the bismuth borosilicate glasses

Impact of bismuth concentration on the fluorescence properties of the bismuth borosilicate glasses

The role of CuO as limiting and luminescent probe for orange red emission of Sm3+ ions in strontium bismuth borosilicate glasses

The properties of glass materials with CuO are suitable for both optical and photovoltaic applications. The role of CuO hinges on the structural properties of glass network. The structural and luminescence properties of melt quenched strontium bismuth borosilicate glasses containing Sm 2 O 3 with varying amounts of CuO (referred as N: SmCu) were studied. Two valence states of Cu ions are possible due to more amount of silica in glass. The amorphous nature of glass was confirmed by XRD and thermal parameters were explained through DTA curves. FTIR spectrum indicated the variation of asymmetric vibrations of SiO 4 units with change in SrO and CuO concentration which influence the valence state of Cu 2+ . The absorption spectra have shown peaks due to 3 d 10 →3 d 9 4s 1 transition of Cu + ions, 6 H 5/2 → 6 P 3/2 transition of Sm 3+ and broad 2 B 1g → 2 B 2g transitions of Cu 2+ ions. The NIR region has peaks of Sm 3+ ions. The Photo Luminescence (PL) spectra of N: SmCu glasses exhibited cyan bluish emission at 485 nm followed by intense emission peaks of Sm 3+ at 312 nm excitation. The emission of N: SmCu10 and N: SmCu12 glasses are quenched due to Cu 2+ ions. Moreover, maximum range of emission is exhibited by ‘N: SmCu8’ glass. The shortening of life time decay observed in ‘N: SmCu’ glasses was inferred to the process of energy transfer. The profiles of life time decay curves are fitted with the help of bi-exponential function. The CIE and CCT values of all glasses are calculated. The white light emission is quite possible in N: SmCu10 glass and the remaining glasses covered Orange - red regions with CCT values ranging from 1892 K–2351 K. The schematic energy level diagram of N: SmCu glasses. • Sm 3+ /Cu 2+ co-doped glasses prepared by melt quench technique. • FTIR show different units of vibrations and DTA profile shows thermal stability. • PL, spectral overlap and life time decay confirms energy transfer. • CIE and CCT value shows white light emission.

Structural characterization and photoluminescence properties of B2O3–Bi2O3–SiO2 glass containing Dy3+ ions

Bismuth borosilicate (BBS) glasses have been widely applied in laser, LED device and nonlinear optics. This work investigates the structural evolution of BBS glasses using the spectral transformation of Dy3+ ions as probe. Glass systems of composition xB2O3-(60-x) Bi2O3–40SiO2-1Dy2O3(x = 10, 20, 30, 40) (mol%) were prepared by the conventional melt quenching technique. The diffraction band of XRD pattern peaked at 2θ = 28.50° slightly shifts to smaller angle with the amount of B2O3 resulting from the more compact network. The absorption cut-off edge in ultraviolet region shifts to the shorter wavelength and band gap energy is enhanced, indicating that the increasing B–O- bonds with the stronger covalence than Bi–O bond. According to Fourier transform infrared (FTIR) and Raman spectra, the conversion of [BiO3] tetrahedral into [BiO6] octahedral takes place. Interestingly, [BO4] tetrahedral began to be transformed into [BO3] triangle when the content of B2O3 exceeds 30mol%, suggesting that the phenomenon of "boron abnormality" exists in BBS glass. The increase in Ω2 values and Y/B ratios reveals the intensifying disorder of glass network. The fluorescence intensity, decay lifetime (τexp) and quantum efficiency (η%) increase due to the enhancement of multi-phonon relaxation process of 4I13/2, 4G11/2 and 4I15/2 level populating 4F9/2 level.

Comparative investigation on the structure and physical properties of CeO2/TiO2/Sb2O3-doped bismuth borosilicate glasses

Glasses with composition of 30Bi2O3-15B2O3-40SiO2-15ZnO doped with CeO2, TiO2 or Sb2O3 were synthesized by melt-quench and were characterized in structure and properties. The results show that dopants allows conversion of [BO3] to [BO4] and facilitates the formation of [BiO3]/[BiO6] units and that glass physical properties are jointly influenced by the dopants-induced network alteration, bond strength and atomic compactness. Thermodynamic calculation combined with reaction kinetics analysis indicate that the varied oxygen bonding affinity of metal oxides as well as their susceptibility to melting temperature significantly affect the valence state of yielded metallic ions species that contribute to energy level transitions of electrons strongly associated with transmittance of the glasses. Oxides with lower oxygen bonding affinity may facilitate the oxidation of those with relatively higher oxygen bonding affinity. Thermodynamic and reaction kinetics methods can thus be used as the semiquantitative tools for optimizing glass synthesis process with tailored optical properties.

Synthesis and luminescent properties of bismuth borosilicate glass doped with Eu3+

The work was aimed at development of glasses for encapsulation of self-glowing crystals, doped with alpha radionuclides. Bismuth borosilicate-based glass systems doped with Eu3+, В2О3-ЅіO2-Аl2О3-Bi2O3-MO (where M = Ba, Sr and Zn) (Si–Bi -x), with various concentrations of activator were studied. The optimal synthesis conditions were selected, the composition of the obtained glasses was investigated using electron-probe microanalysis technique. Optical properties of glasses were investigated using the following methods – cathodoluminescence, photoluminescence and absorption. The range of the optimal activator concentration was determined.

The effect of particle size on radiation shielding properties for bismuth borosilicate glass

The aim of this work is to study the radiation shielding properties of size dependent bismuth in sodium calcium borosilicate glasses. The Bi2O3 in these glasses have the particle size in micrometer (M-BNCBS) have been compared the radiation shielding properties with the glasses that replaced the Bi2O3 with Bi nano-powder (N-BNCBS). The results show that the density of M-BNCBS and N-BNCBS is higher at higher concentration of Bi and the particle size of Bi does not affect to the density of glasses. The molar volumes increase with Bi content and show the higher in N-BNCBS with relative different increase with Bi content due to the NBOs more created. The N-BNCBS have the values of mass attenuation coefficients, effective atomic numbers and electron densities higher than M-BNCBS due to the larger electron cloud density in N-BNCBS. The half value layer of N-BNCBS found to be less than M-BNCBS. These results show that the particle size will affect the radiation shielding properties. Moreover, the radiation shielding properties of these glasses found to be better than Commercial window glass and some standard shielding concrete when compared.

Effect of different stabilizers on dispersion of gold nanoparticles in bismuth borosilicate glass and their intensity dependent nonlinear behaviour

Here, we report the role of different stabilizers (Eu2O3, EuF3 and KSCN) in stabilizing gold nanoparticles (AuNPs) embedded in Bismuth-Borosilicate glasses. The prepared nanocomposites are characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), UV–Visible transmission spectroscopy, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), ellipsometery and Z-scan. From FESEM, it has been observed that the morphology of AuNPs is highly dependent on the type of stabilizer. Also HRTEM confirms the covering of AuNPs by stabilizer that prevents the coagulation of NPs. The localized surface plasmon resonance related transmission dip is observed around 585 nm for glass containing Eu2O3 as a stabilizer. The linear and nonlinear refractive index of the prepared glasses is obtained from ellipsometery and Z-scan measurements, respectively. All the Z-scan measurements have been carried out at different input peak intensities varying from 1.9 to 14.38 GW/cm2. Nonlinear optical studies with open aperture Z-Scan shows the switching between saturable absorption and two photon absorption as the laser intensity is increased. The existence of third order nonlinearity has been detected using closed aperture Z-scan in the prepared glasses.

Z-scan study of nonlinear absorption in gold doped borosilicate glass: Effect of Dy3+

Nonlinearity is one of the most important optical properties widely used in opto-electronic devices. In this work, the optical nonlinearity of a series of Bismuth Borosilicate glasses is compared. The glasses prepared through conventional melt-quench technique comprises of Dy2O3, gold nanoparticles (GNPs) and both Dy2O3 and GNPs. XRD is used to confirm the amorphous nature of the glass whereas FESEM is carried out to observe variation in morphology of GNPs with the addition of Dy2O3. Effect of Dy2O3 on particle size is recorded using HRTEM. DTA is carried out to observe the variation in thermal behaviour of the material. The highest value of nonlinear absorption coefficient (4.35 × 10−12 cmW−1) and third order nonlinear optical susceptibility of 8.68 × 10−9 esu are observed from Z-scan for the glass containing both Dy2O3 and GNPs. The results conclude that the addition of Dy2O3 enhances the nonlinearity of glass containing gold and thus has promising applications in optical devices.

The structural and warm light emission properties of Sm3+/Tb3+ doubly doped strontium bismuth borosilicate glasses for LED applications.

Strontium Bismuth Borosilicate (SrBiBS as N) glasses doped with Tb3+ ions (N: Tb) and co-doped with Sm3+/Tb3+ (N: SmTb) were synthesized through the process of classical melt quenching. The structural and optical properties are investigated through energy dispersive spectroscopy; X-ray diffraction, Differential thermal analysis (DTA) and Fourier transform infrared spectra (FTIR), Optical absorption (OA) and photoluminescence (PL) spectral studies. X-ray diffraction indicates amorphous nature of glass. DTA curves explained the thermal stability and stress parameters of glasses. FTIR spectrum indicates existing vibrations of borate and silicate units. The absorption spectra have shown nine absorption bands of Tb3+ ions in the visible and NIR regions, due to transitions from ground state 7F6. In visible region, absorption spectra of co-doped glasses exhibited two bands of Tb3+ and three bands of Sm3+ with hyper sensitive transitions at 375 nm (7F6 → 5G6) and 401 nm (6H5/2 → 6P3/2). Photo Luminescence (PL) spectra of N: Tb and N: SmTb glasses is recorded at 375 nm excitation. N: Tb glasses have shown green emission corresponding to 5D4 → 7F5 transition. In all N: SmTb glasses, addition of Tb3+ ions has enhanced Sm3+ emission which is connected to quenching of Tb3+ emission. Moreover, 0.8 mol% of Tb3+ ions in co-doped glass (N: SmTb8) has shown maximum emission. The energy transfer process was inferred from shortening of decay times observed in N: SmTb glasses. The decay profiles fitted with Inokuti-Hirayama model suggests that the electric dipole-dipole interaction(S = 6) between Sm3+ and Tb3+ might dominate in energy transfer mechanism with probability PET and energy transfer parameter Q of 113-173 S-1 and 9.9-12.0 respectively. The color chromaticity (CIE) coordinates from PL emission of N: Tb & N: SmTb glasses have covered Green, Orange red and yellow (warm-light) regions with coordinates in ranges of x = 0.39-0.62 and y = 0.34-0.56.The color temperatures in range of 1713 K-4258 K.

Tunable white light by varying excitations in yttrium alumino bismuth borosilicate glasses co-doped with Dy3+-Eu3+ for cool WLED applications

Yttrium alumino bismuth borosilicate (YABiBS) glasses doped with RE3+ ions (Eu3+, Dy3+, Dy3+- Eu3+) have been synthesized via standard melt quenching technique and their emission properties were investigated. Optical analysis of these glasses is characterized by absorption and luminescence. XRD spectra reveal that these glasses have amorphous nature. The absorption spectra of these co-doped glasses consist five bands of Dy3+ which are assigned to 6H15/2 → 6F3/2 (750 nm), 6F5/2 (796 nm), 6F9/2 (1085 nm), 6F11/2 (1264 nm),6H11/2 (1677 nm) and another four bands of Eu3+ assigned to 7F0 → 5L6 (393 nm) Meza-Rocha et al. (2017) [5],5D2 (464 nm), 7F6 (2097 nm), and 7F1 → 7F6 (2202 nm). It is also witnessed a broad band having electronic transition 1S0 → 1P1 is due to Bi3+ ions. Optical band gaps, nephelauxetic ratio, and bonding parameters are discussed by using optical absorption data. Eu3+ single doped glasses show five emission bands, with the n-UV excitation wavelength 393 nm, in which characteristic feature red emission (612 nm) is recognized with transition (Meza-Rocha et al., 2017 [5])D0 → 7F2. At the same time, Dy3+ single doped glasses illuminated with the excitation wavelength of 385 nm shows their known natural emissions blue (481 nm) and yellow (574 nm), having transitions 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 respectively. Emission for co-doped glasses Dy3+-Eu3+ are excited with the different selected ultraviolet wavelengths such as 464 nm, 392 nm, 385 nm, 363 nm, and 348 nm. It can be observed that tunable emission from both the ions (Dy3+, Eu3+) from orange reddish emission to white emission. The energy transfer from Dy3+ to Eu3+ is manifested by the quadrupole-quadrupole mechanism, which is confirmed by Inokuti-Hirayama (IH) modal based on lifetime decay curves. Also, the efficiencies and probabilities of energy transfer are determined based on the results of decay curves. The CIE color coordinates of DE1.0 glass with the excitation 348 nm gives x, y coordinates as (0.332, 0.342) which confers the good white emission. CCT value for this glass is around 5520 K shows that useful for cool WLED applications.

Optical properties of Sm3+ doped strontium bismuth borosilicate glasses for laser applications

Stupendous progress in realizing optical materials is due to extreme strides which were adapted so far in understanding optical properties of materials. Keeping this in view a series of Bismuth Borosilicate glasses modified with strontium and doped with various concentrations of Sm3+ (SrOBi2O3B2O3SiO2Sm2O3) have been prepared by classical melt quench technique. These glasses were structurally characterized by XRD to confirm amorphous nature. Vibration mode analysis of samples has been analyzed by infrared transmission spectroscopy. This paper show cases various optical phenomena such as absorption and luminescence which plays a key role in design of engineered optical materials. To understand absorption, optical excitation, emission and time decay process optical spectroscopy measurements were done. Judd-Ofelt (JO) theory was employed to determine intensity parameters Ωλ=2,4,6 for symmetry of ligand environment existing among Sm3+ ions. From emission spectra various radiative parameters like transition probability (Ar), branching ratios (βr) and radiative time were determined. Emission bands of 4G5/2 → 6H5/2 (560 nm), 4G5/2 → 6H7/2 (599 nm) 4G5/2 → 6H9/2 (636 nm) and 4G5/2 → 6H11/2 (708 nm) have been recorded with excitation at 401 nm. Above all emission wavelengths 599 nm is more intense and has shown a bright orange emission. Among four emission bands corresponding to 4G5/2 → 6H7/2 transition in emission spectra shows high (σE) peak stimulated emission (22.85 × 10−22 cm2) and optical gain (O.G) is (28.33 × 10−25 cm2s) assure optoelectronic applications. The life time τ exp of excited level 4G5/2 was determined through decay and non-exponential decay curves. Inokuti-Hirayama model was used to fit non exponential curve for the analysis of luminescence quenching, quantum efficiency (96%), transfer mechanism of energy among Sm3+ ions to ensure Laser applications. CIE colour chromaticity coordinates of present Sm3+ doped glasses also suggest the synthesized glasses are suitable improvement of orange-red lasers.