Article
Materials Science, Multidisciplinary
Mei-Hong Liu, Jia-Min Liu, Feng Chen, De-Long Zhang
Summary: The study shows that Omega(t) mainly depends on strong and medium-intensity transitions, which must all be included in the fit to obtain accurate results. Additionally, Omega(t) changes almost linearly with the IAC or IACS of an individual transition, with the linear slope depending on the size of the [U-(t)](2) value. Furthermore, Omega(2), Omega(4) and Omega(6) are interdependent due to their relationship with the n-ary summation Omega(t)[U-(t)](2).
Article
Chemistry, Physical
Guanghui Sun, Qiuling Chen
Summary: A novel red-emission Ca2LiScB4O10: Sm3+ phosphor system with well-distributed monoclinic morphology was synthesized. The doping of Sm3+ ions resulted in lattice expansion and a shift in diffraction peaks. Changes in coordination groups and crystal structure were observed. The photoluminescence properties, including excitation/emission spectra, decay lifetime, and thermal stability, were systematically investigated and explained. The 0.7%Sm phosphor exhibited significant pure and strong reddish emission, making it promising for WLED device application.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Lukasz Marek, Marcin Sobczyk
Summary: Research was conducted on the spectroscopic characteristics of tellurite glasses doped with Dy3+ ions, including emission and absorption spectra, luminescence decay kinetics, and emission cross-sections. Strong concentration quenching of Dy3+ emission was observed, with dipole-dipole interaction playing a significant role in luminescence quenching.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
R. A. Tafida, M. K. Halimah, M. N. Azlan, S. B. Adamu, I. I. Lakin
Summary: The present study investigates the effect of samarium oxide concentration on the linear optical properties of zinc tellurite glasses. The results show that the density and molar volume of the glasses increase with an increase in samarium oxide concentration. The glasses exhibit amorphous structure and potential for laser application, as demonstrated by UV-Vis absorption and emission spectra.
Article
Chemistry, Physical
Andrei Racu, Marius Stef, Gabriel Buse, Irina Nicoara, Daniel Vizman
Summary: The influence of erbium ion concentration on the optical properties of BaF2:ErF3 crystals was investigated in this study. By measuring optical absorption, photoluminescence, and decay times, the effect of ErF3 concentration on various parameters was studied. Results showed changes in emission intensity and a new UV emission band at 321 nm under different excitation wavelengths. Other research has not reported such findings related to ErF3 concentration and emission behavior.
Article
Chemistry, Physical
R. Ruamnikhom, P. Yasaka, K. Boonin, P. Limsuwan, J. Kaewkhao
Summary: Investigations have been conducted on the physical, optical, and photo-radio luminescence properties of dysprosium doped bismuth barium gadolinium borate glass. The results show that the glass has good luminescence performance, producing white light emission suitable for various applications.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Optics
Y. A. Yamusa, Y. Musa, T. Muhammad, A. Sa'id, A. Isma'ila, A. U. Abubakar, I. Bulus
Summary: Barium sulfoborophosphate (PBBs) glasses activated with varying contents of Sm3+ ions were prepared and optically characterized. The UV-Vis-NIR spectra showed several absorption bands corresponding to transitions of Sm3+ ions, while the photoluminescence spectra exhibited four prominent emission bands. The glass sample with a 0.7 mol. % concentration of samarium ions showed the highest luminescence intensity. The results from the Judd-Ofelt analysis indicated that this sample had a branching ratio over 50%, a color purity of 99.56%, and a quantum efficiency of 86.21%, making it suitable for visible red laser and display device applications.
Article
Materials Science, Multidisciplinary
Mei-Hong Liu, Jia-Min Liu, Feng Chen, De-Long Zhang
Summary: The dependence of Judd-Ofelt intensity parameters and their relative ratios on the overall changing factor of integrated absorption bands of Er3+ has been studied. The linear feature changes between different materials, and the relative ratios show significant changes in smaller q regions due to the presence of the magnetic-dipole oscillator. To obtain precise Omega(t) values using the relevant method, a large enough q value is necessary, which can be achieved by using a thin powder plate with low Er3+ concentration for spectral measurement.
Article
Materials Science, Multidisciplinary
Mohamed Atef Cherbib, Ismail Khattech, Habib Elhouichet
Summary: This study investigates the effects of phosphate network topology on the luminescent properties of mixed sodium/alkaline earths metaphosphate glasses doped with Sm2O3. Through experimental analysis, it was found that the structure of the glasses has a significant impact on their luminescence.
Article
Materials Science, Ceramics
M. Mohapatra, P. Vinothkumar, K. Sathyamoorthy, Priya Murugasen
Summary: By adjusting the Si/Li ratio, the photoluminescence intensity and decay time values of these ceramic compounds can be increased. Rare earth ions stabilize themselves at interstitial positions in the lattice with approximately C-2v symmetry. The four ceramic samples doped with Eu exhibit near red emission and good quantum efficiencies for phosphors.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
J. Bhemarajam, Swapna, M. Mohan Babu, P. Syam Prasad, M. Prasad
Summary: Erbium-doped heavy metal oxide glasses with low concentrations of erbium oxide were prepared and extensively studied for their structural and optical properties. The luminescence properties of the glasses were found to improve with increasing Er3+ ion content up to 1.5 mol%, before decreasing due to luminescence quenching. The glasses show promise for potential applications in display devices, optical amplifiers, and green lasers.
Article
Optics
E. Vinogradova, L. Dolgov, V. A. Konyushkin, E. O. Orlovskaya, E. A. Vagapova, A. Treshchalov, V Peet, V Hizhnyakov, Yu Orlovskii
Summary: In this study, highly symmetric cubic centers with Oh symmetry were formed at very low concentrations of the Nd3+ ion in the Nd3+:CaF2 crystal. The optical centers of the Nd3+ ion with anomalously long radiative lifetime were detected in the single crystal, showing inhomogeneous splitting and attributed to nearly cubic sites with symmetry close to O-h. Additionally, optical sites with different radiative lifetimes were identified and explained using the Judd-Ofelt approach to understand the emission rates in different optical sites of the same rare-earth ion.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Physical
Binghui Huang, Bo Zhang, Xiaobo Qian, Jingya Wang, Qiuhong Yang, Liangbi Su
Summary: In this study, Er3+ doped Bi4Ge3O12(BGO) crystals were investigated for their temperature sensing performance, showing that the sensitivity first increased and then decreased with the increase of Er3+ ion concentration, with the maximum sensitivity achieved in the 0.3 mol% Er3+ doped sample. The calculation using the Judd-Ofelt (J-O) theory revealed a larger ratio of green radiation transition rate at the thermal coupling level in the 0.3 mol% Er3+ doped Bi4Ge3O12 sample, suggesting it as a good candidate material for optical temperature sensing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yue Li, Fangli Jing, Xuliang Zhang, Dongcheng Yang, Zhanggui Hu, Yicheng Wu
Summary: The crystal growth and spectral properties of Eu3+ doped La2CaB10O19 (Eu3+LCB) single crystals were studied. The results showed that Eu3+ ions first enter La3+ sites and then occupy Ca2+ sites after the nominal atomic ratio of Eu3+ ions exceeds 7%. The 7% Eu3+-LCB single crystal was found to be a promising medium for laser radiation in the visible region.
Article
Materials Science, Ceramics
Marta Kuwik, Karolina Kowalska, Joanna Pisarska, Wojciech A. A. Pisarski
Summary: The NIR luminescence of Pr3+ and Tm3+ ions in titanate-germanate glasses was studied for laser and fiber amplifier applications. The effect of the GeO2:TiO2 molar ratio on the spectroscopic properties of the glasses was investigated using absorption, luminescence measurements, and theoretical calculations. Strong NIR emissions were observed at 1.5 and 1.8 μm for glasses doped with Pr3+ and Tm3+ ions, respectively, regardless of the TiO2 concentration. The spectroscopic and laser parameters of the Pr3+ and Tm3+ ions were determined and compared to other laser glasses, and it was found that the Pr3+-doped glass with a GeO2:TiO2 ratio of 2:1 and the Tm3+-doped glass with a GeO2:TiO2 ratio of 1:2 exhibited favorable laser characteristics for use in NIR lasers and broadband optical amplifiers.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Optics
Thangavel Sakthivel, G. Annadurai, R. Vijayakumar, Xiaoyong Huang
JOURNAL OF LUMINESCENCE
(2019)
Article
Engineering, Electrical & Electronic
R. Vijayakumar, Xiaoyong Huang
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2019)
Article
Materials Science, Ceramics
M. Mariyappan, S. Arunkumar, K. Marimuthu
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2020)
Article
Materials Science, Ceramics
R. Divina, G. Sathiyapriya, K. Marimuthu, A. Askin, M. Sayyed
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2020)
Article
Materials Science, Multidisciplinary
K. A. Naseer, K. Marimuthu
Summary: In this study, a series of Er3+-Yb3+ co-doped bismuth borophosphate glasses were synthesized and characterized. The analysis revealed that the intensity of the green transition varied with Yb2O3 concentration, which could potentially be beneficial for green-laser and broadband optical-amplifier applications.
Article
Optics
R. Vijayakumar, Balaji Devakumar, Xiaoyong Huang
Summary: Ce3+/Tb3+ co-doped Ba2Gd5B5O17 borate phosphors exhibit broad excitation bands, color-tunable emission outputs, and energy transfer mechanism between Ce3+ and Tb3+. The intensity ratio of emission spectra can be adjusted by doping concentration, and the phosphors show good thermal stability.
JOURNAL OF LUMINESCENCE
(2021)
Article
Physics, Multidisciplinary
K. A. Naseer, K. Marimuthu, K. A. Mahmoud, M. I. Sayyed
Summary: A series of Bi2O3 varying BZX glasses were fabricated by melt-quenching method and examined for their physical, structural, elastic, and radiation-shielding properties. With increasing Bi2O3 concentration, the BZX glasses exhibited higher ionic nature and linear attenuation coefficient values. Among the investigated samples, BZ30 glass was identified as the more effective shield due to its highest MAC and LAC values.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Materials Science, Multidisciplinary
R. Nagaraj, R. Vijayakumar, N. Karunagaran, Arumugam Raja, S. Ranjith
Summary: A new reddish-orange emitting KBaScSi3O9:Sm3+ phosphor was successfully prepared and characterized in this study. Among all the studied phosphors, KBSS:0.06Sm phosphor exhibited higher luminescence intensity, making it a potential candidate for reddish-orange emitting devices.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
P. Evangelin Teresa, K. Marimuthu
Summary: Multi glass formers, such as the BTPEZn glass, have shown promising potential as efficient laser hosts with high luminescence performance and quantum efficiency. The elements incorporated in these glasses play a key role in determining their optical and structural properties, making them suitable for red laser applications.
Article
Chemistry, Physical
P. Evangelin Teresa, K. A. Naseer, K. Marimuthu, Hoda Alavian, M. I. Sayyed
Summary: Highly efficient gamma ray shielding glasses were synthesized with specific chemical composition, showing better performance in shielding ionic nature rather than covalency. The study found that glasses with higher SrO content exhibit superior shielding against lower energy photons, while BaO glasses perform better in shielding photons over a wide energy range.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Spectroscopy
R. Nagaraj, Vijayakumar Rajagopal, Arumugam Raja, S. Ranjith
Summary: The novel white light emitting silicate-based phosphor xDyKBS demonstrated intense yellow and blue emission peaks, with the yellow emission peak showing higher intensity. Under near-UV excitation, the phosphor can emit warm and neutral white light, making it a promising candidate for applications in warm white LEDs, solar cells, optical sensors, and lasers.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Engineering, Electrical & Electronic
V Parthibaraj, K. Maheshvaran, R. Vijayakumar
Summary: In this study, a series of Ce3+ and Tb3+ ions co-doped NaBaB9O15 phosphors were prepared using the high-temperature solid-state reaction technique. The purity and photoluminescence behavior of the samples were examined. The results showed that the Ce3+ and Tb3+ co-doped NaBaB9O15 samples exhibited intense green emission with high internal quantum efficiency and excellent thermal stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
A. Suresh Kumar, R. Arun Kumar, R. Vijayakumar
Summary: Green-emitting phosphor CaAl4O7:Er3+ was successfully synthesized. Co-doping with Na+ and Li+ ions enhanced the luminescence property. The phosphor showed good thermal stability and can be used in white LED as efficient green-emitting material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Optics
Vijayakumar Rajagopal, Rong-Jun Xie, R. Nagaraj
Summary: In this study, rare earth free and narrow-band red-emitting BaZnBO3F:xBi2+ phosphors were synthesized and investigated, showing potential for application in blue excited white LEDs.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Physical
M. K. Komal Poojha, M. Vijayakumar, S. A. Bassam, M. I. Sayyed, K. Marimuthu, Mohammed S. Alqahtani, E. El Shiekh
Summary: The present work aims to study the radiation shielding properties of lead boro-tellurite glasses modified with different cations (Na, Li, Mg) and anions (oxygen, fluorine). The glasses were synthesized using the melt quenching technique and their properties were characterized. The results show that the addition of modifiers changes the density, molar volume, and optical absorption spectra of the glasses. The gamma photon attenuation abilities of the glasses were evaluated and the results demonstrate that the incorporation of Mg cations as fluorides improves the radiation shielding properties of the glass system.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)