Gd2O2S:Tb is promising for energy-efficient lighting and display applications. This work explores the use of reactive spark plasma sintering (SPS) to synthesis Gd2O2S:Tb nanocrystalline phosphor. It allows to significantly simplify the technological process in comparison with traditional multi-stage liquid-phase synthesis. As-sintered Gd2O2S:Tb demonstrated average crystallite size of 26 nm and secondary particle size of 26 μm. Bright green emission occurs at 545 nm under UV excitation of 245 nm. Average fluorescence lifetime was 0.656 ms. Further consolidation of the Gd2O2S:Tb prepared via reactive SPS can also be expected to yield highly dense ceramics. The innovative reactive synthesis strategies provide valuable insights into the design and development of high-performance luminescent ceramics.
{"title":"Reactive spark plasma sintering and luminescence properties of Gd2O2S:Tb nanocrystalline phosphor","authors":"O.O. Shichalin , Yun Shi , A.A. Vornovskikh , Z.E. Kornakova , A.V. Amosov , A.A. Belov , A.I. Seroshtan , N.P. Ivanov , P.A. Marmaza , I. Yu Buravlev , D.S. Starev , D.Yu Kosyanov , E.K. Papynov","doi":"10.1016/j.optmat.2024.116312","DOIUrl":"10.1016/j.optmat.2024.116312","url":null,"abstract":"<div><div>Gd<sub>2</sub>O<sub>2</sub>S:Tb is promising for energy-efficient lighting and display applications. This work explores the use of reactive spark plasma sintering (SPS) to synthesis Gd<sub>2</sub>O<sub>2</sub>S:Tb nanocrystalline phosphor. It allows to significantly simplify the technological process in comparison with traditional multi-stage liquid-phase synthesis. As-sintered Gd<sub>2</sub>O<sub>2</sub>S:Tb demonstrated average crystallite size of 26 nm and secondary particle size of 26 μm. Bright green emission occurs at 545 nm under UV excitation of 245 nm. Average fluorescence lifetime was 0.656 ms. Further consolidation of the Gd<sub>2</sub>O<sub>2</sub>S:Tb prepared via reactive SPS can also be expected to yield highly dense ceramics. The innovative reactive synthesis strategies provide valuable insights into the design and development of high-performance luminescent ceramics.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116312"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.optmat.2024.116304
Shaan Bibi Jaffri , Khuram Shahzad Ahmad , Isaac Abrahams , Adel El-marghany
This study presents the first report on the microwave approach combined with improved sustainable synthesis of zinc oxide (ZnO) and niobium oxide (Nb2O5) to generate Nb2O5 – ZnO nanospheres. Following the development of nanospheres, the band gap energy decreased to 3.25 eV, and the average crystallite size was found to be 62.49 nm. The nanospheres had a mixed crystalline phase of hexagonal and orthogonal crystals. This material has demonstrated a predisposition towards hydrogen production in the electro-catalytic tests, with a minimal overpotential (ηHER) and a Tafel slope values of 127 mV and 125.6 mV dec−1. Furthermore, nanospheres decorated electrode remained intact in electrolyte environment for 1500 min and exhibited profound charge storage of 204.93 F g−1 15 % PV efficiency was attained by the air-processed perovskite solar cell thanks to the interface passivation functionality. The commendable performance of the binary Nb2O5 – ZnO nanospheres have validated their prospects for practical applications.
{"title":"Microwave fostered sustainable synthesis of Nb2O5 – ZnO nanomaterial for efficiency amplification in high performing energy systems","authors":"Shaan Bibi Jaffri , Khuram Shahzad Ahmad , Isaac Abrahams , Adel El-marghany","doi":"10.1016/j.optmat.2024.116304","DOIUrl":"10.1016/j.optmat.2024.116304","url":null,"abstract":"<div><div>This study presents the first report on the microwave approach combined with improved sustainable synthesis of zinc oxide (ZnO) and niobium oxide (Nb<sub>2</sub>O<sub>5</sub>) to generate Nb<sub>2</sub>O5 – ZnO nanospheres. Following the development of nanospheres, the band gap energy decreased to 3.25 eV, and the average crystallite size was found to be 62.49 nm. The nanospheres had a mixed crystalline phase of hexagonal and orthogonal crystals. This material has demonstrated a predisposition towards hydrogen production in the electro-catalytic tests, with a minimal overpotential (η<sub>HER</sub>) and a Tafel slope values of 127 mV and 125.6 mV dec<sup>−1</sup>. Furthermore, nanospheres decorated electrode remained intact in electrolyte environment for 1500 min and exhibited profound charge storage of 204.93 F g<sup>−1</sup> 15 % PV efficiency was attained by the air-processed perovskite solar cell thanks to the interface passivation functionality. The commendable performance of the binary Nb<sub>2</sub>O<sub>5</sub> – ZnO nanospheres have validated their prospects for practical applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116304"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.optmat.2024.116310
Soad M. Tadros , Mohamed El-Kinawy , R. Kamal , M. Saif , Nabil El-Faramawy
Through the citrate-assisted sol-gel method, barium gadolinium tungstate (Ba6Y2W3O18) perovskite samples were synthesized, and their luminescence properties were investigated. Through X-ray diffraction (XRD) the crystal structure of the prepared samples was examined. The tunnelling electron microscopy (TEM) analysis has confirmed the agglomeration of the nanoparticles into rods with an average diameter and length of 71 and 214 nm, respectively. The thermoluminescence (TL) properties were investigated by; first, estimating the number of composing TL components using both experimental and computational methods; second, studying the dose-response of the glow curves in response to the irradiated beta dose. The third step in the study of the TL properties was to assess the reusability of the prepared samples in TL dosimetry and the fourth step was to estimate the minimum detectable dose of the phosphor samples. The Computerized Glow Curve Deconvolution (CGCD) method was then used to extract the kinetic parameters of the composing TL peaks.
{"title":"Synthesis and thermoluminescence characterization of Ba₆Y₂W₃O₁₈ perovskite nanosensors for dosimetry","authors":"Soad M. Tadros , Mohamed El-Kinawy , R. Kamal , M. Saif , Nabil El-Faramawy","doi":"10.1016/j.optmat.2024.116310","DOIUrl":"10.1016/j.optmat.2024.116310","url":null,"abstract":"<div><div>Through the citrate-assisted sol-gel method, barium gadolinium tungstate (Ba<sub>6</sub>Y<sub>2</sub>W<sub>3</sub>O<sub>18</sub>) perovskite samples were synthesized, and their luminescence properties were investigated. Through X-ray diffraction (XRD) the crystal structure of the prepared samples was examined. The tunnelling electron microscopy (TEM) analysis has confirmed the agglomeration of the nanoparticles into rods with an average diameter and length of 71 and 214 nm, respectively. The thermoluminescence (TL) properties were investigated by; first, estimating the number of composing TL components using both experimental and computational methods; second, studying the dose-response of the glow curves in response to the irradiated beta dose. The third step in the study of the TL properties was to assess the reusability of the prepared samples in TL dosimetry and the fourth step was to estimate the minimum detectable dose of the phosphor samples. The Computerized Glow Curve Deconvolution (CGCD) method was then used to extract the kinetic parameters of the composing TL peaks.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116310"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current investigation studied one of the high-density heavy metal oxides (Bi2O3) having density = 8.9 g/cm³, which was utilized to improve structural and optical features of the B2O3–TeO2-GeO2-MgO glass system. Three high transparent glasses with a chemical formula of 35B2O3–20TeO2-10GeO2-35MgO-xBi2O3 (x = 5, 10, and 15 mol %) were fabricated by melting at 1100 °C for 20 min and annealing at 400 °C for 5 h. X-ray diffraction measurements for the Bi5 sample, containing 5 mol % Bi2O3, were obtained at the range of 10°–80° to inspect the structural characteristics of the made glasses. Optical absorption was employed and recorded for Bi5, Bi10, and Bi15 samples at wavelength range 300–1000 nm to examine the optical properties, including optical band gap. Using Makishima and Mackenzie methods, the mechanical features of the glass samples were assessed. Nuclear library ENDF/B-VI.8 is coupled to the MCNP-5 code and is used to study and simulate the prepared Bi glass sample shielding parameters. The ionizing absorption properties for the prepared Bi5, Bi10, and Bi15 samples were found to be changed because of many circumstances like the photon energy (Eγ, MeV), and chemical compositions (Bi2O3 content (mol. %). The increased layer thickness of glass between 25 and 200 mm enhances the RPE values at 0.6 MeV over the range of 16.31–50.93 % (Bi5 glass sample), 18.68–56.26 % (Bi10 glass sample), and 20.80–60.66 % (Bi15 glass sample).
{"title":"High transparent glass of germanate-borate-tellurite modified by different concentration of bismuth oxide for optical and radiation shielding applications","authors":"K.A. Mahmoud , M.I. Sayyed , M.H.A. Mhareb , Abed Jawad Kadhim , Kawa M. Kaky , M. Kh Hamad , S.O. Baki","doi":"10.1016/j.optmat.2024.116319","DOIUrl":"10.1016/j.optmat.2024.116319","url":null,"abstract":"<div><div>The current investigation studied one of the high-density heavy metal oxides (Bi<sub>2</sub>O<sub>3</sub>) having density = 8.9 g/cm³, which was utilized to improve structural and optical features of the B<sub>2</sub>O<sub>3</sub>–TeO<sub>2</sub>-GeO<sub>2</sub>-MgO glass system. Three high transparent glasses with a chemical formula of 35B<sub>2</sub>O<sub>3</sub>–20TeO<sub>2</sub>-10GeO<sub>2</sub>-35MgO-xBi<sub>2</sub>O<sub>3</sub> (x = 5, 10, and 15 mol %) were fabricated by melting at 1100 °C for 20 min and annealing at 400 °C for 5 h. X-ray diffraction measurements for the Bi5 sample, containing 5 mol % Bi<sub>2</sub>O<sub>3</sub>, were obtained at the range of 10°–80° to inspect the structural characteristics of the made glasses. Optical absorption was employed and recorded for Bi5, Bi10, and Bi15 samples at wavelength range 300–1000 nm to examine the optical properties, including optical band gap. Using Makishima and Mackenzie methods, the mechanical features of the glass samples were assessed. Nuclear library ENDF/B-VI.8 is coupled to the MCNP-5 code and is used to study and simulate the prepared Bi glass sample shielding parameters. The ionizing absorption properties for the prepared Bi5, Bi10, and Bi15 samples were found to be changed because of many circumstances like the photon energy (Eγ, MeV), and chemical compositions (Bi<sub>2</sub>O<sub>3</sub> content (mol. %). The increased layer thickness of glass between 25 and 200 mm enhances the RPE values at 0.6 MeV over the range of 16.31–50.93 % (Bi5 glass sample), 18.68–56.26 % (Bi10 glass sample), and 20.80–60.66 % (Bi15 glass sample).</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116319"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.optmat.2024.116297
Anjali Sharma, B. Karthikeyan
In this study, we introduce an efficient nanocomposite system to enhance optical properties of Nickel oxide (NiO) integrated with two polymers matrix. NiO nanoparticles is prepared using chemical co-precipitation method and its nanocomposite films (NCFs) were prepared with poly methyl methacrylate (PMMA) and polyaniline (PANI) using drop-casting method on glass substrate and was optimized by changing the concentration of NiO. The prepared NCFs were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), ultraviolet (UV)-visible absorption spectroscopy, photoluminescence (PL) spectroscopy and X-ray photoelectron (XPS) spectroscopy. The open-aperture z-scan method is employed for nonlinear optical investigations, utilizing a nanosecond pulsed laser with a wavelength of 532 nm for excitation. The findings indicate that the NCFs exhibit sign-flipping nonlinear behavior, indicating a transition from saturable absorption to reverse saturable absorption. This suggests that our NCFs exhibit optical limiting properties and potential for applications in photonic devices, such as optical switches and laser protection systems.
在本研究中，我们介绍了一种高效的纳米复合材料系统，用于增强氧化镍（NiO）与两种聚合物基质的光学特性。我们采用化学共沉淀法制备了氧化镍纳米粒子，并通过滴铸法在玻璃基底上制备了氧化镍与聚甲基丙烯酸甲酯（PMMA）和聚苯胺（PANI）的纳米复合薄膜（NCFs），并通过改变氧化镍的浓度对其进行了优化。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、紫外可见吸收光谱、光致发光 (PL) 光谱和 X 射线光电子 (XPS) 光谱对制备的 NCFs 进行了表征。利用波长为 532 纳米的纳秒脉冲激光进行激发，采用开放孔径 Z 扫描法进行非线性光学研究。研究结果表明，NCFs 表现出符号翻转非线性行为，表明其从可饱和吸收过渡到反向可饱和吸收。这表明我们的 NCF 具有光限制特性，有望应用于光子设备，如光学开关和激光保护系统。
{"title":"Optical and sign-flipping nonlinear optical properties of NiO/PMMA/PANI nanocomposite films","authors":"Anjali Sharma, B. Karthikeyan","doi":"10.1016/j.optmat.2024.116297","DOIUrl":"10.1016/j.optmat.2024.116297","url":null,"abstract":"<div><div>In this study, we introduce an efficient nanocomposite system to enhance optical properties of Nickel oxide (NiO) integrated with two polymers matrix. NiO nanoparticles is prepared using chemical co-precipitation method and its nanocomposite films (NCFs) were prepared with poly methyl methacrylate (PMMA) and polyaniline (PANI) using drop-casting method on glass substrate and was optimized by changing the concentration of NiO. The prepared NCFs were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), ultraviolet (UV)-visible absorption spectroscopy, photoluminescence (PL) spectroscopy and X-ray photoelectron (XPS) spectroscopy. The open-aperture z-scan method is employed for nonlinear optical investigations, utilizing a nanosecond pulsed laser with a wavelength of 532 nm for excitation. The findings indicate that the NCFs exhibit sign-flipping nonlinear behavior, indicating a transition from saturable absorption to reverse saturable absorption. This suggests that our NCFs exhibit optical limiting properties and potential for applications in photonic devices, such as optical switches and laser protection systems.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116297"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigates the impact of Ultra-High Vacuum (UHV) Thermal annealing in a N₂/O₂ atmosphere on the passivation of Ar ion etched crystalline silicon (c-Si) surfaces. A comprehensive analysis of the resulting ultrathin Silicon OxyNitride Carbide layer (SiONC) was conducted using X-ray Photoelectron Spectroscopy (XPS), Ultra-Violet Spectroscopy (UPS), Photoluminescence Spectroscopy (PL), and Atomic Force Microscopy (AFM). XPS revealed a significant transformation in chemical composition from a carbon-rich contaminated surface SiO1.02C2.98 to an oxygen- and nitrogen-containing passivated layer SiO0.13N0.10C0.28. UPS measurements elucidated changes in the electronic structure and Fermi level position at the c-Si/SiONC interface. AFM imaging demonstrated the formation of non-uniform SiONC islands, influencing surface morphology. Notably, PL spectroscopy indicated enhanced orange and red luminescence with energies of 2.0 and 1.73 eV, respectively, attributed to the SiONC layer. The enhanced luminescence, coupled with improved thermal stability and oxidation resistance, positions the SiONC layer as a promising material for advancing the performance of silicon-based optoelectronic devices, such as solar cells and light-emitting diodes (LEDs). This study provides fundamental insights into the correlation between the chemical, electronic, and morphological properties of the SiONC layer and its potential for improving c-Si device performance.
{"title":"Ultrathin SiONC passivation of c-Si by UHV thermal annealing in O₂/N₂: Chemical composition, morphology, and photoluminescence insights","authors":"Brahim Halitim , M'hamed Guezzoul , Abdelkader Nouri , Chewki Zegadi , M'hammed Bouslama","doi":"10.1016/j.optmat.2024.116311","DOIUrl":"10.1016/j.optmat.2024.116311","url":null,"abstract":"<div><div>This study investigates the impact of Ultra-High Vacuum (UHV) Thermal annealing in a N₂/O₂ atmosphere on the passivation of Ar ion etched crystalline silicon (c-Si) surfaces. A comprehensive analysis of the resulting ultrathin Silicon OxyNitride Carbide layer (SiONC) was conducted using X-ray Photoelectron Spectroscopy (XPS), Ultra-Violet Spectroscopy (UPS), Photoluminescence Spectroscopy (PL), and Atomic Force Microscopy (AFM). XPS revealed a significant transformation in chemical composition from a carbon-rich contaminated surface SiO<sub>1.02</sub>C<sub>2.98</sub> to an oxygen- and nitrogen-containing passivated layer SiO<sub>0.13</sub>N<sub>0.10</sub>C<sub>0.28</sub>. UPS measurements elucidated changes in the electronic structure and Fermi level position at the c-Si/SiONC interface. AFM imaging demonstrated the formation of non-uniform SiONC islands, influencing surface morphology. Notably, PL spectroscopy indicated enhanced orange and red luminescence with energies of 2.0 and 1.73 eV, respectively, attributed to the SiONC layer. The enhanced luminescence, coupled with improved thermal stability and oxidation resistance, positions the SiONC layer as a promising material for advancing the performance of silicon-based optoelectronic devices, such as solar cells and light-emitting diodes (LEDs). This study provides fundamental insights into the correlation between the chemical, electronic, and morphological properties of the SiONC layer and its potential for improving c-Si device performance.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116311"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new device architecture of bi-facial dye sensitized solar cell (DSSC) is designed, fabricated by use of novel photoelectrode design contains MXenes. The developed bi-facial DSSC witnessed higher power conversion efficiency (PCE) of 12.82 % with short-circuit current density (JSC) of 27.46 mA/cm2. The DSSC revealed 9.74 % of PCE by front side illumination and 4.57 % by back side illuminations. The results motivated to develop mini-module of series connected 12 test cells, which results in 13.34 % of PCE.
{"title":"High performance Bi-facial dye sensitized solar cells developed using MXenes assisted novel photoelectrode design","authors":"Muni Mounika Parnapalli , Neeraja Adike , Bhavana Thatapi , Meenakshamma Ambapuram , Susmitha Kalvapalli , Vijayalaxmi Tankasala , Raghavender Mitty","doi":"10.1016/j.optmat.2024.116302","DOIUrl":"10.1016/j.optmat.2024.116302","url":null,"abstract":"<div><div>A new device architecture of bi-facial dye sensitized solar cell (DSSC) is designed, fabricated by use of novel photoelectrode design contains MXenes. The developed bi-facial DSSC witnessed higher power conversion efficiency (PCE) of 12.82 % with short-circuit current density (J<sub>SC</sub>) of 27.46 mA/cm<sup>2</sup>. The DSSC revealed 9.74 % of PCE by front side illumination and 4.57 % by back side illuminations. The results motivated to develop mini-module of series connected 12 test cells, which results in 13.34 % of PCE.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116302"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.optmat.2024.116294
Abely E. Mwakuna , R.K.N.R. Manepalli , C. Laxmikanth
This study investigates the effect of substituting boron oxide (B2O3) with heavy metal oxides (HEMOs) on the structural, mechanical, and gamma-ray shielding properties of potassium borate (KB) glass systems. The glass compositions analyzed include 80B2O3–20K2O and 65B2O3–20K2O-15HEMO (where, HEMO = BaO, Bi2O3, or Pb3O4). All samples were prepared using the melt-quenching method, and their amorphous nature was confirmed through X-ray diffraction (XRD). Fourier-transform infrared spectroscopy (FTIR) had revealed BO3, BO4, and BiO6 groups beside the B–O–B linkages. The density increased with the addition of HEMOs, following the order: Pb3O4 (KB4) > Bi2O3 (KB3) > BaO (KB2) > and pure KB (KB1). This trend was also observed in the molar volume (Vₘ) and oxygen molar volume (Vₒ), while the oxygen packing density (Pρ) decreased. Mechanical properties assessed using the Makishima-Mackenzie model indicated that KB3 exhibited the highest elastic modulus (Yₘ) and Poisson's ratio (μ). The microhardness (Hₘ) followed the sequence KB2 > KB3 > KB4 > KB1, attributed to the higher bonding energy in KB2. Gamma-ray shielding parameters, including mass attenuation coefficients (MAC), were calculated using Phy-X and XCOM software for photon energies between 0.2835 MeV and 1.333 MeV. KB4 (Pb3O4) showed superior shielding performance with the highest linear attenuation coefficient (LAC) and the lowest half-value layer (HVL) and mean free path (MFP). Despite KB4's high density, KB3 (Bi2O3) is suggested as a more suitable candidate for radiation shielding applications due to its balanced combination of mechanical strength and γ-ray attenuation efficiency.
{"title":"Structural, elastic and gamma-ray attenuation properties of potassium borate glasses doped with BaO, Bi2O3, or Pb3O4: A comparative assessment","authors":"Abely E. Mwakuna , R.K.N.R. Manepalli , C. Laxmikanth","doi":"10.1016/j.optmat.2024.116294","DOIUrl":"10.1016/j.optmat.2024.116294","url":null,"abstract":"<div><div>This study investigates the effect of substituting boron oxide (B<sub>2</sub>O<sub>3</sub>) with heavy metal oxides (HEMOs) on the structural, mechanical, and gamma-ray shielding properties of potassium borate (KB) glass systems. The glass compositions analyzed include 80B<sub>2</sub>O<sub>3</sub>–20K<sub>2</sub>O and 65B<sub>2</sub>O<sub>3</sub>–20K<sub>2</sub>O-15HEMO (where, HEMO = BaO, Bi<sub>2</sub>O<sub>3</sub>, or Pb<sub>3</sub>O<sub>4</sub>). All samples were prepared using the melt-quenching method, and their amorphous nature was confirmed through X-ray diffraction (XRD). Fourier-transform infrared spectroscopy (FTIR) had revealed BO<sub>3</sub>, BO<sub>4</sub>, and BiO<sub>6</sub> groups beside the B–<em>O</em>–B linkages. The density increased with the addition of HEMOs, following the order: Pb<sub>3</sub>O<sub>4</sub> (KB4) > Bi<sub>2</sub>O<sub>3</sub> (KB3) > BaO (KB2) > and pure KB (KB1). This trend was also observed in the molar volume (Vₘ) and oxygen molar volume (Vₒ), while the oxygen packing density (<em>P</em><sub>ρ</sub>) decreased. Mechanical properties assessed using the Makishima-Mackenzie model indicated that KB3 exhibited the highest elastic modulus (Yₘ) and Poisson's ratio (μ). The microhardness (Hₘ) followed the sequence KB2 > KB3 > KB4 > KB1, attributed to the higher bonding energy in KB2. Gamma-ray shielding parameters, including mass attenuation coefficients (MAC), were calculated using Phy-X and XCOM software for photon energies between 0.2835 MeV and 1.333 MeV. KB4 (Pb<sub>3</sub>O<sub>4</sub>) showed superior shielding performance with the highest linear attenuation coefficient (LAC) and the lowest half-value layer (HVL) and mean free path (MFP). Despite KB4's high density, KB3 (Bi<sub>2</sub>O<sub>3</sub>) is suggested as a more suitable candidate for radiation shielding applications due to its balanced combination of mechanical strength and γ-ray attenuation efficiency.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116294"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.optmat.2024.116323
Faisal Nadeem , Huanrong Fan , Iqbal Hussain , Muhammad Kashif Majeed , Muhammad Usman , Faizan Raza , Changbiao Li , Yanpeng Zhang
In this paper, we studied the relationship between non-Hermitian quantization and line shape in ion-doped microcrystals. We depict the Eu3+: BiPO4 exhibited a broad line shape in contrast to Eu3+: NaYF4, and Dy3+: BiPO4. The line shape is controlled through angle quantization (constructive and destructive quantization) and phonon detuning effects. The Eu3+: BiPO4 and Eu3+: NaYF4 exhibits less sensitivity to line shape as compared to Dy3+: BiPO4. The more sensitivity of Dy3+: BiPO4 is supported by the presence of multiple levels, which disrupt the transition from destructive (out of phase de-phase rate Г) to constructive (in phase dressing Rabi frequency G) three-dimensional quantization. The line shape evolution from out of phase to in phase could be tuned by changing time gate position (the ratio of G and Г regulated largely) and time gate width (the ratio of G and Г regulated on a small scale). We observed that the line shape ratio in Dy3+: BiPO4 is significantly smallest (13.63 %) as compared to Eu3+: NaYF4 (61.29 %) and Eu3+: BiPO4 (85.18 %). Furthermore, the angle quantization affects the line shape evolution of fluorescence and Autler-Townes. However, spontaneous four-wave mixing line shape evolution can not be controlled by the angle quantization. Such results hold significant potential for applications in long band stop filter.
{"title":"Comparison of non-Hermitian three-dimensional quantization line shape in ion-doped microcrystals","authors":"Faisal Nadeem , Huanrong Fan , Iqbal Hussain , Muhammad Kashif Majeed , Muhammad Usman , Faizan Raza , Changbiao Li , Yanpeng Zhang","doi":"10.1016/j.optmat.2024.116323","DOIUrl":"10.1016/j.optmat.2024.116323","url":null,"abstract":"<div><div>In this paper, we studied the relationship between non-Hermitian quantization and line shape in ion-doped microcrystals. We depict the Eu<sup>3+</sup>: BiPO<sub>4</sub> exhibited a broad line shape in contrast to Eu<sup>3+</sup>: NaYF<sub>4</sub>, and Dy<sup>3+</sup>: BiPO<sub>4</sub>. The line shape is controlled through angle quantization (constructive and destructive quantization) and phonon detuning effects. The Eu<sup>3+</sup>: BiPO<sub>4</sub> and Eu<sup>3+</sup>: NaYF<sub>4</sub> exhibits less sensitivity to line shape as compared to Dy<sup>3+</sup>: BiPO<sub>4</sub>. The more sensitivity of Dy<sup>3+</sup>: BiPO<sub>4</sub> is supported by the presence of multiple levels, which disrupt the transition from destructive (out of phase de-phase rate Г) to constructive (in phase dressing Rabi frequency G) three-dimensional quantization. The line shape evolution from out of phase to in phase could be tuned by changing time gate position (the ratio of G and Г regulated largely) and time gate width (the ratio of G and Г regulated on a small scale). We observed that the line shape ratio in Dy<sup>3+</sup>: BiPO<sub>4</sub> is significantly smallest (13.63 %) as compared to Eu<sup>3+</sup>: NaYF<sub>4</sub> (61.29 %) and Eu<sup>3+</sup>: BiPO<sub>4</sub> (85.18 %). Furthermore, the angle quantization affects the line shape evolution of fluorescence and Autler-Townes. However, spontaneous four-wave mixing line shape evolution can not be controlled by the angle quantization. Such results hold significant potential for applications in long band stop filter.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116323"},"PeriodicalIF":3.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-21DOI: 10.1016/j.optmat.2024.116269
Erika T. Gaifullina , Artemiy G. Shmelev , Ramilya М. Gataullina , Zarema R. Zarafutdinova , Тimur A. Kornev , Guliya R. Nizameeva , Rustem R. Zairov , Anna B. Ziyatdinova , Rustem R. Amirov
For the first time, sulfur quantum dots (SQDs) were obtained in the presence of the cationic surfactant myristyl trimethylammonium bromide (MTAB) using two approaches: “bottom-up” and “top-down”. The synthesis of SQDs from sodium thiosulfate in presence of MTAB required 2 h heating at 70 °C resulting in a solution with stable photoluminescence (quantum yield 18 %). SQDs from sulfur were fabricated during 12 h heating only after etching by hydrogen peroxide. It has been established that the hydrogen peroxide is ineffective agent for SQDs syntheses from sodium thiosulfate (“bottom-up” technique).
{"title":"Sulfur quantum dots stabilized by myristyl trimethylammonium bromide","authors":"Erika T. Gaifullina , Artemiy G. Shmelev , Ramilya М. Gataullina , Zarema R. Zarafutdinova , Тimur A. Kornev , Guliya R. Nizameeva , Rustem R. Zairov , Anna B. Ziyatdinova , Rustem R. Amirov","doi":"10.1016/j.optmat.2024.116269","DOIUrl":"10.1016/j.optmat.2024.116269","url":null,"abstract":"<div><div>For the first time, sulfur quantum dots (SQDs) were obtained in the presence of the cationic surfactant myristyl trimethylammonium bromide (MTAB) using two approaches: “bottom-up” and “top-down”. The synthesis of SQDs from sodium thiosulfate in presence of MTAB required 2 h heating at 70 °C resulting in a solution with stable photoluminescence (quantum yield 18 %). SQDs from sulfur were fabricated during 12 h heating only after etching by hydrogen peroxide. It has been established that the hydrogen peroxide is ineffective agent for SQDs syntheses from sodium thiosulfate (“bottom-up” technique).</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116269"},"PeriodicalIF":3.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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