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Devi PPK, Sekhar AV, Kumar VR, Baskaran GS, Venkatramaiah N, Kumar VR, Veeraiah N. Amplification of blue emission of Tm 3+ ions in Li 2 O-HfO 2 -SiO 2 glass system by means of Au 0 metallic particles. LUMINESCENCE 2023; 38:450-461. [PMID: 36808703 DOI: 10.1002/bio.4468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 02/13/2023] [Indexed: 02/22/2023]
Abstract
Li2 O-HfO2 -SiO2 -Tm2 O3 :Au2 O3 glass samples (containing fixed content of Tm2 O3 and different concentration of Au2 O3 ) were prepared and characterized. Bearing of Au0 metallic particles (MPs) on improving blue emission of thulium ions (Tm3+ ) ions was explored. Optical absorption (OA) spectra exhibited multiple bands excited from 3 H6 of Tm3+ . Additionally, a broad peak in the wavelength range 500-600 nm due to surface plasmon resonance (SPR) of Au0 MPs was noticed in the spectra. Photoluminescence (PL) spectra (of thulium free glasses) indicated a peak in the visible range due to sp → d electronic transition of Au0 MPs. Luminescence spectra of Tm3+ and Au2 O3 co-doped glasses exhibited intense blue emission with substantial increase of intensity with increase of Au2 O3 content. Bearing of Au0 MPs on the reinforcement of blue emission of Tm3+ was discussed in detail with kinetic rate equations.
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Affiliation(s)
| | | | - Valluri Ravi Kumar
- Department of Physics, Andhra Loyola Institute of Engineering and Technology, Vijayawada, India
| | | | | | - Vandana Ravi Kumar
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, India
| | - Nalluri Veeraiah
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, India.,Department of Physics, Andhra Loyola College, Vijayawada, India
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2
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Dosimetric characterization for optimum concentration in rare earth doped hafnium oxide nanophosphors for medical radiotherapy applications. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Wang X, Jahanbazi F, Wei J, Segre CU, Chen W, Mao Y. Charge Transfer-Triggered Bi 3+ Near-Infrared Emission in Y 2Ti 2O 7 for Dual-Mode Temperature Sensing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:36834-36844. [PMID: 35921172 DOI: 10.1021/acsami.2c09361] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Trivalent bismuth is a popular main group ion showing versatile luminescent behaviors in a broad spectral range from ultraviolet to visible, but barely in the near-infrared (NIR) region. In this study, we have observed unexpected NIR emission at ∼744 nm in a Bi3+-doped pyrochlore, Y2Ti2O7 (YTOB). Our first-principles electronic structure calculation and analysis of the Bi local structure via extended X-ray absorption fine structure indicate that only Bi3+ species appears in YTOB and it has a similar local environment to that of Y3+. The NIR emission is assigned to a Ti4+ → Bi3+ metal-to-metal charge transfer process. Moreover, we have demonstrated dual-mode luminescence thermometry based on the luminescence intensity ratio (LIR) and lifetime (τ) in 0.5% Bi3+ and 0.5% Pr3+ co-doped Y2Ti2O7 (YTOB0.5P0.5). It exhibits high thermometric sensitivity simultaneously in the cryogenic temperature range from 78 to 298 K based on τ of the NIR emission of Bi3+ at 748 nm and in the temperature range of 278-378 K based on the LIR of Bi3+ to Pr3+ emissions (I748/I615). As a novel LIR-τ dual-mode thermometric material over a wide temperature range, the maximum relative sensitivities of the YTOB0.5P0.5 reach 3.53% K-1 at 298 K from the τ mode and 3.52% K-1 at 318 K based on the LIR mode. The dual-mode luminescence thermometry with high responsivity from our Bi3+-based pyrochlore Y2Ti2O7 phosphor opens a new avenue for more luminescent materials toward multi-mode thermometry applied in complex temperature-sensing conditions.
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Affiliation(s)
- Xianli Wang
- Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Forough Jahanbazi
- Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Jialiang Wei
- Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Carlo U Segre
- Center for Synchrotron Radiation Research and Instrumentation and Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Wei Chen
- Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Yuanbing Mao
- Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, United States
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4
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Wang Y, Darapaneni P, Ofoegbuna T, Gupta SK, Kizilkaya O, Mao Y, Dorman JA. Effect of Oxide Ion Distribution on a Uranium Structure in Highly U-Doped RE 2Hf 2O 7 (RE = La and Gd) Nanoparticles. Inorg Chem 2020; 59:14070-14077. [PMID: 32960587 DOI: 10.1021/acs.inorgchem.0c01850] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rare-earth based A2B2O7 compounds have been considered as potential host materials for nuclear waste due to their exceptional chemical, physical, capability of accommodating high concentration of actinides at both A- and B-sites, negligible leaching, tendency to form antisite defects, and radiation stabilities. In this work, La2Hf2O7 (LHO) and Gd2Hf2O7 (GHO) nanoparticles (NPs) were chosen as the RE-based hafnates to study the structural changes and the formation of different U molecular structures upon doping (or alloying) at high concentration (up to 30 mol %) using a combined coprecipitation and molten-salt synthesis. These compounds form similar crystal structures, i.e., ordered pyrochlore (LHO) and disordered fluorite (GHO), but are expected to show different phase transformations at high U doping concentration. X-ray diffraction (XRD) and Rietveld refinement results show that the LHO:U NPs have high structural stability, whereas the GHO:U NPs exhibit a highly disordered structure at high U concentration. Alternatively, the vibrational spectra show an increasingly random oxygen distribution with U doping, driving the LHO:U NPs to the disordered fluorite phase. X-ray spectroscopy indicates that U is stabilized as different U6+ species in both LHO and GHO hosts, resulting in the formation of oxygen vacancies stemming from the U local coordination and different phase transformation. Interestingly, the disordered fluorite phase has been reported to have increased radiation tolerance, suggesting multiple benefits associated with the LHO host. These results demonstrate the importance of the structural and chemical effect of actinide dopants on similar host matrices which are important for the development of RE-based hafnates for nuclear waste hosts, sensors, thermal barrier coatings, and scintillator applications.
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Affiliation(s)
- Yuming Wang
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Pragathi Darapaneni
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Tochukwu Ofoegbuna
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Santosh K Gupta
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Orhan Kizilkaya
- Center for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, Louisiana 70806, United States
| | - Yuanbing Mao
- Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - James A Dorman
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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5
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Pop L, Rada S, An P, Zhang J, Rada M, Suciu RC, Culea E. Characteristics and local structure of hafnia-silicate-zirconate ceramic nanomixtures. JOURNAL OF SYNCHROTRON RADIATION 2020; 27:970-978. [PMID: 33566006 DOI: 10.1107/s1600577520006207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 05/07/2020] [Indexed: 06/12/2023]
Abstract
Zirconate systems having the composition 3HfO2·15SiO2·xY2O3·(82 - x)ZrO2, where x = 2, 7 and 12 mol% Y2O3, were synthesized by a sol-gel method. The analysis of X-ray diffraction data showed the presence of the t-ZrO2, m-ZrO2, m-HfO2, Y2SiO5 and Y2Si2O7 crystalline phases in a ceramic nanomixture. Spectroscopic data show that the increase of the Y2O3 content of samples determines the increase of the t-ZrO2, m-HfO2 and silicate crystalline phases. Gap energy values decrease almost linearly with increasing Y2O3 content of samples. A detailed study of XANES data does not show a significant difference with increasing Y2O3 content of the samples suggesting an appreciable stability of the hafnium ions +4 oxidation state and their microvicinity. EXAFS results show that the local structure around the Hf cation is similar to that from the monoclinic crystalline HfO2 where the Hf-O coordination number tends to 7. The bond lengths of Hf-O shells show small deviations from ∼2.12 Å and the Hf-metal paths become more structured by increasing the Y2O3 content of the samples.
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Affiliation(s)
- L Pop
- Department of Physics and Chemistry, Technical University of Cluj-Napoca, Cluj-Napoca 400020, Romania
| | - S Rada
- Department of Physics and Chemistry, Technical University of Cluj-Napoca, Cluj-Napoca 400020, Romania
| | - P An
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - J Zhang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - M Rada
- National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca 400293, Romania
| | - R C Suciu
- National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca 400293, Romania
| | - E Culea
- Department of Physics and Chemistry, Technical University of Cluj-Napoca, Cluj-Napoca 400020, Romania
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Chantelle L, Menezes de Oliveira AL, Kennedy BJ, Maul J, da Silva MRS, Duarte TM, Albuquerque AR, Sambrano JR, Landers R, Siu-Li M, Longo E, dos Santos IMG. Probing the Site-Selective Doping in SrSnO3:Eu Oxides and Its Impact on the Crystal and Electronic Structures Using Synchrotron Radiation and DFT Simulations. Inorg Chem 2020; 59:7666-7680. [PMID: 32338503 DOI: 10.1021/acs.inorgchem.0c00664] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laís Chantelle
- NPE-LACOM, Dept de Quı́mica, Universidade Federal da Paraı́ba, João Pessoa - Paraı́ba 58051−085, Brazil
| | - André L. Menezes de Oliveira
- NPE-LACOM, Dept de Quı́mica, Universidade Federal da Paraı́ba, João Pessoa - Paraı́ba 58051−085, Brazil
- School of Chemistry, The University of Sydney, Sydney - New South Wales 2006, Australia
| | - Brendan J. Kennedy
- School of Chemistry, The University of Sydney, Sydney - New South Wales 2006, Australia
| | - Jefferson Maul
- Dipartimento di Chimica, Universita di Torino, via Giuria 5, 10125, Torino, Italy
| | - Márcia R. S. da Silva
- NPE-LACOM, Dept de Quı́mica, Universidade Federal da Paraı́ba, João Pessoa - Paraı́ba 58051−085, Brazil
| | - Thiago M. Duarte
- NPE-LACOM, Dept de Quı́mica, Universidade Federal da Paraı́ba, João Pessoa - Paraı́ba 58051−085, Brazil
| | - Anderson R. Albuquerque
- Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal - Rio Grande do Norte 59078-970, Brazil
| | - Julio R. Sambrano
- Grupo de Simulação e Modelagem Molecular, Universidade Estadual Paulista, Bauru − São Paulo 17033-360, Brazil
| | - Richard Landers
- Instituto de Fı́sica Gleb Wataghin, Universidade Estadual de Campinas, Campinas − São Paulo 13083-859, Brazil
| | - Máximo Siu-Li
- Instituto de Física, Universidade de São Paulo, São Carlos - São Paulo 13563-120, Brazil
| | - Elson Longo
- LIEC/INCTMN, Universidade Estadual Paulista, Araraquara - São Paulo 14800-060, Brazil
| | - Iêda M. G. dos Santos
- NPE-LACOM, Dept de Quı́mica, Universidade Federal da Paraı́ba, João Pessoa - Paraı́ba 58051−085, Brazil
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Zhang K, Chen Y, Wang X, Wang L. Structure and red emissions of Eu3+-doped hydrocalumite prepared in ethanol/water media. J RARE EARTH 2019. [DOI: 10.1016/j.jre.2018.04.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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8
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Sharma A, Varshney M, Chae KH, Won SO. Electronic structure and luminescence assets in white-light emitting Ca2V2O7, Sr2V2O7 and Ba2V2O7 pyro-vanadates: X-ray absorption spectroscopy investigations. RSC Adv 2018; 8:26423-26431. [PMID: 35541933 PMCID: PMC9083135 DOI: 10.1039/c8ra03347a] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 07/18/2018] [Indexed: 12/21/2022] Open
Abstract
Ca2V2O7, Sr2V2O7, and Ba2V2O7 pyro-vanadates were synthesized using a modified chemical precipitation method and annealing. Detailed crystal structure, morphology, electronic structure and optical properties were investigated by XRD, UV-visible absorption, FTIR, Raman, FE-SEM, XANES, and photoluminescence spectroscopy. Rietveld refinement on the XRD patterns of Ca2V2O7, Sr2V2O7, and Ba2V2O7 has confirmed the triclinic structure (space group; P1̄(2)) of the pyro-vanadates. The band gap energy of Ca2V2O7, Sr2V2O7, and Ba2V2O7 is estimated to be ∼2.67 eV, ∼2.97 eV and ∼3.09 eV, respectively. XANES spectra at the Ca L-edge, Sr K-edge and Ba L-edge have confirmed the Ca2+, Sr2+ and Ba2+ ions in the Ca2V2O7, Sr2V2O7 and Ba2V2O7 compounds, respectively. V K-edge XANES spectra have strengthened the presence of sub-pentavalent V ions in all of the pyro-vanadates. O K-edge XANES spectra of Ca2V2O7, Sr2V2O7 and Ba2V2O7 have shown dominating tetrahedral symmetry of the V ions which is also corroborated with the V K-edge XANES. Broad-band emission spectra, ranging from 400 nm to 700 nm, have been observed from the charge-transfer transitions of VO4 tetrahedra. 3T1 → 1A1 and 3T2 → 1A1 transitions, from the VO4 tetrahedra, have provided two distinct emission peaks from the compounds which exhibit a red-shift with the decreasing ionic-radii of alkali-earth metal ions. The mixed compounds, with equal weight proportions, have shown remarkable emission characteristics towards the realization of rare-earth element free white-light-emitting devices. Chemically synthesized pyro-vanadates exhibit sub-pentavalent V ions and white-light emission via charge transfer transitions of VO4 tetrahedra.![]()
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Affiliation(s)
- Aditya Sharma
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul-02792
- South Korea
| | - Mayora Varshney
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul-02792
- South Korea
| | - Keun-Hwa Chae
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul-02792
- South Korea
| | - Sung Ok Won
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul-02792
- South Korea
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9
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Schie M, Müller MP, Salinga M, Waser R, De Souza RA. Ion migration in crystalline and amorphous HfOX. J Chem Phys 2017. [DOI: 10.1063/1.4977453] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Marcel Schie
- Institute of Materials in Electrical Engineering and Information Technology II, RWTH Aachen University, 52056 Aachen, Germany
| | - Michael P. Müller
- Institute of Physical Chemistry, RWTH Aachen University and JARA-FIT, 52056 Aachen, Germany
| | - Martin Salinga
- I. Physikalisches Institut 1A, RWTH Aachen University, 52056 Aachen, Germany
| | - Rainer Waser
- Institute of Materials in Electrical Engineering and Information Technology II, RWTH Aachen University, 52056 Aachen, Germany
| | - Roger A. De Souza
- Institute of Physical Chemistry, RWTH Aachen University and JARA-FIT, 52056 Aachen, Germany
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Sharma A, Varshney M, Shin HJ, Chae KH, Won SO. Investigation on cation distribution and luminescence in spinel phase γ-Ga3−δO4 : Sm nanostructures using X-ray absorption spectroscopy. RSC Adv 2017. [DOI: 10.1039/c7ra10341g] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
In this study, spectroscopic investigations are employed to quantify the Ga distribution over the tetrahedral/octahedral sites and to assimilate the luminescence properties in the barely reported γ-Ga2.67O4 : Sm nanoparticles.
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Affiliation(s)
- Aditya Sharma
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
| | - Mayora Varshney
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
| | - Hyun-Joon Shin
- Pohang Accelerator Laboratory (POSTECH)
- Pohang-37673
- South Korea
| | - Keun Hwa Chae
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
| | - Sung Ok Won
- Advanced Analysis Centre
- Korea Institute of Science and Technology
- Seoul-02792
- South Korea
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Sharma A, Varshney M, Cheol Lim W, Shin HJ, Pal Singh J, Ok Won S, Hwa Chae K. Mechanistic insights on the electronic properties and electronic/atomic structure aspects in orthorhombic SrVO3 thin films: XANES–EXAFS study. Phys Chem Chem Phys 2017; 19:6397-6405. [DOI: 10.1039/c6cp08301c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Distortion in the V–O6 octahedra is observed in SrVO3 thin films and leads to larder separation between bonding and anti-bonding d‖ orbitals.
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Affiliation(s)
- Aditya Sharma
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul – 02792
- South Korea
| | - Mayora Varshney
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul – 02792
- South Korea
| | - Weon Cheol Lim
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul – 02792
- South Korea
| | - Hyun-Joon Shin
- Pohang Accelerator Laboratory (POSTECH)
- Pohang – 37673
- South Korea
| | - Jitendra Pal Singh
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul – 02792
- South Korea
| | - Sung Ok Won
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul – 02792
- South Korea
| | - Keun Hwa Chae
- Advance Analysis Centre
- Korea Institute of Science and Technology (KIST)
- Seoul – 02792
- South Korea
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