1
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Valadez-Renteria E, Perez-Carrasco C, Medina-Velazquez DY, Rodriguez-Gonzalez V, Oliva J. Efficient removal of the recalcitrant metamizole contaminant from drinking water by using a CaLaCoO 9 perovskite supported on recycled polyethylene. J Environ Sci (China) 2024; 136:56-67. [PMID: 37923465 DOI: 10.1016/j.jes.2022.09.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 09/20/2022] [Accepted: 09/29/2022] [Indexed: 11/07/2023]
Abstract
Metamizole (MZ) is a widely used anti-inflammatory drug. Due to its common use, this contaminant is found in sewage and rivers. In order to reduce the contamination produced by the MZ, we fabricated in this work a photocatalytic composite using recycled polyethylene (RPE) and the CaLaCoO9 (LCCO) perovskite. Those nanoparticles had a microplate-like morphology and sizes of 1.4-5.5 µm according to the analysis of microscopy. The photocatalytic properties of the LCCO powders were evaluated under ultraviolet-visible (UV-Vis) irradiation and found a removal efficiency of 96%. When the RPE+LCCO composite was employed for the photocatalytic degradation of MZ, a maximum degradation of 92.5% was obtained. The influence of the pH on the photocatalytic activity was also studied and found that an initial pH = 3 produced a total degradation of MZ after 240 min of UV-Vis irradiation. Moreover, three reuse cycles were carried out for the pure LCCO powders and for the RPE+LCCO composites and found that the maximum loss of degradation was 5%. Furthermore, scavenger experiments demonstrated that the super oxide and hydroxyl radicals are formed during the photocatalytic reaction and were responsible for the degradation of MZ. Additionally, the X-ray photoelectron-spectroscopy and Raman analysis demonstrated the formation of defects (oxygen vacancies), those ones delayed the electron-hole recombination, which in turn, enhanced the degradation of the MZ. Thus, the studies performed in this work proved that composites made with recycled plastics and LCCO perovskites are a low-cost and feasible alternative for the cleaning of water sources polluted with pharmaceutical compounds.
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Affiliation(s)
- Ernesto Valadez-Renteria
- CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., San Luis Potosí, SLP 78216, México
| | - Christian Perez-Carrasco
- División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana Azcapotzalco, Col. Reynosa-Tamaulipas, C.P., México, DF 02200, México
| | - Dulce Yolotzin Medina-Velazquez
- División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana Azcapotzalco, Col. Reynosa-Tamaulipas, C.P., México, DF 02200, México.
| | - Vicente Rodriguez-Gonzalez
- CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., San Luis Potosí, SLP 78216, México
| | - Jorge Oliva
- CONACYT-División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A. C., San Luis Potosí, SLP 78216, México.
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2
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Wang Y, Han Y, Liu R, Duan C, Li H. Excitation-Controlled Host-Guest Multicolor Luminescence in Lanthanide-Doped Calcium Zirconate for Information Encryption. Molecules 2023; 28:7623. [PMID: 38005346 PMCID: PMC10675260 DOI: 10.3390/molecules28227623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 11/05/2023] [Accepted: 11/13/2023] [Indexed: 11/26/2023] Open
Abstract
Efficient control over lanthanide luminescence by regulating excitations offers a real-time and reversible luminescence-managing strategy, which is of great importance and highly desirable for various applications, including multicolor display and information encryption. Herein, we studied the crystal structure, luminescence properties, and mechanisms of undoped and Tb3+/Eu3+-doped CaZrO3 in detail. The intrinsic purple-blue luminescence from host CaZrO3 and the introduced green/red luminescence from guest dopants Tb3+/Eu3+ were found to have different excitation mechanisms and, therefore, different excitation wavelength ranges. This enables the regulation of luminescent color through controlling the excitation wavelengths of Tb3+/Eu3+-doped CaZrO3. Furthermore, preliminary applications for information encryption with these materials were demonstrated using portable UV lamps of 254 and 302 nm. This study not only promotes the development of multicolor luminescence regulation in fixed-composition materials, but also advances the practical applications of lanthanide luminescent materials in visually readable, high-level anti-counterfeiting and information encryption.
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Affiliation(s)
- Yangbo Wang
- School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Yingdong Han
- College of Science, Civil Aviation University of China, Tianjin 300300, China;
| | - Runfa Liu
- School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Cunping Duan
- School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Huaiyong Li
- School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
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3
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Winczewski JP, Arriaga Dávila J, Herrera-Zaldívar M, Ruiz-Zepeda F, Córdova-Castro RM, Pérez de la Vega CR, Cabriel C, Izeddin I, Gardeniers H, Susarrey-Arce A. 3D-Architected Alkaline-Earth Perovskites. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023:e2307077. [PMID: 37793118 DOI: 10.1002/adma.202307077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/21/2023] [Indexed: 10/06/2023]
Abstract
3D ceramic architectures are captivating geometrical features with an immense demand in optics. In this work, an additive manufacturing (AM) approach for printing alkaline-earth perovskite 3D microarchitectures is developed. The approach enables custom-made photoresists suited for two-photon lithography, permitting the production of alkaline-earth perovskite (BaZrO3 , CaZrO3 , and SrZrO3 ) 3D structures shaped in the form of octet-truss lattices, gyroids, or inspired architectures like sodalite zeolite, and C60 buckyballs with micrometric and nanometric feature sizes. Alkaline-earth perovskite morphological, structural, and chemical characteristics are studied. The optical properties of such perovskite architectures are investigated using cathodoluminescence and wide-field photoluminescence emission to estimate the lifetime rate and defects in BaZrO3 , CaZrO3 , and SrZrO3 . From a broad perspective, this AM methodology facilitates the production of 3D-structured mixed oxides. These findings are the first steps toward dimensionally refined high-refractive-index ceramics for micro-optics and other terrains like (photo/electro)catalysis.
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Affiliation(s)
- Jędrzej P Winczewski
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, Enschede, 7500 AE, The Netherlands
| | - Joel Arriaga Dávila
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, Enschede, 7500 AE, The Netherlands
| | - Manuel Herrera-Zaldívar
- Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Km 107 Carretera Tijuana-Ensenada, Ensenada, Baja California, México, C.P. 22800, USA
| | - Francisco Ruiz-Zepeda
- National Institute of Chemistry, Hajdrihova 19, Ljubljana, SI-1000, Slovenia
- Department of Physics and Chemistry of Materials, Institute of Metals and Technology, Lepi pot 11, Ljubljana, Slovenia
| | | | | | - Clément Cabriel
- Institut Langevin, ESPCI Paris, CNRS, PSL University, 1 rue Jussieu, Paris, 75005, France
| | - Ignacio Izeddin
- Institut Langevin, ESPCI Paris, CNRS, PSL University, 1 rue Jussieu, Paris, 75005, France
| | - Han Gardeniers
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, Enschede, 7500 AE, The Netherlands
| | - Arturo Susarrey-Arce
- Mesoscale Chemical Systems, MESA+ Institute, University of Twente, P.O. Box 217, Enschede, 7500 AE, The Netherlands
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4
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Liu HJ, Chiang CY, Wu YS, Lin LR, Ye YC, Huang YH, Tsai JL, Lai YC, Munprom R. Breaking the Relation between Activity and Stability of the Oxygen-Evolution Reaction by Highly Doping Ru in Wide-Band-Gap SrTiO 3 as Electrocatalyst. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05539] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Heng-Jui Liu
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Ching-Yu Chiang
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Yun-Sheng Wu
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Li-Ren Lin
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Yi-Chen Ye
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Yi-Hong Huang
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Jai-Lin Tsai
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Ying-Chih Lai
- Department of Material Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
| | - Ratiporn Munprom
- Department of Materials Engineering, Kasetsart University, Bangkok 10900, Thailand
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5
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Kunti AK, Patra N, Harris RA, Sharma SK, Bhattacharyya D, Jha SN, Swart HC. Structural properties and luminescence dynamics of CaZrO3:Eu3+ phosphors. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01178a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In the present work, the effect of Eu3+ doping concentration on the structural and luminescence properties of Eu3+ doped CaZrO3 red phosphors was investigated.
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Affiliation(s)
- Arup K. Kunti
- Centre de Nanosciences et de Nanotechnologies (C2N)
- UMR 9001 CNRS
- Université Paris Saclay
- Palaiseau
- France
| | - Nirmalendu Patra
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - Richard A. Harris
- Department of Physics
- University of Free State
- Bloemfontein
- South Africa
| | - Shailendra K. Sharma
- Department of Applied Physics
- Indian Institute of Technology (Indian School of Mines)
- Dhanbad-826004
- India
| | | | - Sambhu N. Jha
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - Hendrik C. Swart
- Department of Physics
- University of Free State
- Bloemfontein
- South Africa
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6
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Gupta SK, Prasad KS, Pathak N, Kadam R. Color tuning in CaZrO3:RE3+ perovskite by choice of rare earth ion. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128776] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Phatak R, Pathak N, Muhammed S, Sali SK, Das A. Crystal Structure and Site Symmetry of Undoped and Eu 3+ Doped Ba 2 LaSbO 6 and BaLaMSbO 6 Compounds (M=Mg,Ca): Tuning Europium Site Occupancy to Develop Orange and Red Phosphor. Chempluschem 2020; 83:1144-1152. [PMID: 31950708 DOI: 10.1002/cplu.201800514] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/20/2018] [Indexed: 11/12/2022]
Abstract
Double perovskite antimonates of the type BaLaMSbO6 (M=Mg, Ca) were synthesized by a standard solid-state route. The compounds were characterized by X-ray crystallography and the structures were refined using Rietveld method. BaLaMgSbO6 and BaLaCaSbO6 crystallized in monoclinic space groups (I2/m) and (P21 /n), respectively. In both compounds, La occupied the A-site of perovskite, which is 12-coordinated as compared to Ba2 LaSbO6 where La ion shifts to the B-site octahedral coordination due to the larger size of Ba as compared with Mg and Ca. The samples were further characterized using FTIR and the frequency of the octahedral vibration is correlated to the electronegativity of the B-site ions. Photoluminescence study of the title compounds and Ba2 LaSbO6 was carried out upon doping with 2 atom% Eu3+ ion, which confirmed that Eu3+ occupies distorted 12-coordinated A-site in BaLaMSbO6 (M=Mg, Ca) and symmetrical octahedral B-site in Ba2 LaSbO6 . Furthermore, the emission spectrum corresponding to each Eu3+ ion at different crystal site was successfully isolated through a TRES study. This site selective occupancy of Eu3+ ion also has a direct impact on the light emission, which was found to change from orange to red in a dark room in the order Ba2 LaSbO6 : Eu→BaLaCaSbO6 : Eu→BaLaMgSbO6 : Eu. Such an outcome will have high impact in designing new commercial Eu3+ ion doped phosphor materials and tailoring of their optical properties.
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Affiliation(s)
- Rohan Phatak
- Fuel Chemistry Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
| | - Nimai Pathak
- Radiochemistry Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
| | - Shafeeq Muhammed
- Fuel Chemistry Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
| | - Sanjay K Sali
- Fuel Chemistry Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
| | - Amitabh Das
- Solid State Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
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8
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Srivastava BB, Gupta SK, Li Y, Mao Y. Bright persistent green emitting water-dispersible Zn2GeO4:Mn nanorods. Dalton Trans 2020; 49:7328-7340. [DOI: 10.1039/d0dt00361a] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work reports on a green and facile approach for designing bright and persistent green luminescent Zn2GeO4:Mn2+ nano crystals with high quantum yield (∼52%) and water dispersibility designated for LEDs, security, and bio imaging.
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Affiliation(s)
| | - Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Yang Li
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Yuanbing Mao
- Department of Chemistry
- Illinois Institute of Technology
- Chicago
- USA
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9
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Soares da Silva J, Machado TR, Martins TA, Assis M, Foggi CC, Macedo NG, Beltrán-Mir H, Cordoncillo E, Andrés J, Longo E. α-AgVO 3 Decorated by Hydroxyapatite (Ca 10(PO 4) 6(OH) 2): Tuning Its Photoluminescence Emissions and Bactericidal Activity. Inorg Chem 2019; 58:5900-5913. [PMID: 31012582 DOI: 10.1021/acs.inorgchem.9b00249] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Defect-related luminescent materials have attracted interest because of their excellent optical properties and are considered as a less expensive and nontoxic alternative to commonly used lanthanide-based optical systems. These materials are fundamentally and technologically important for the next generation of full-color tunable light-emitting diodes as well as in the biomedical field. In this study, we report the preparation of α-silver vanadate (α-AgVO3, AV) decorated by hydroxyapatite (Ca10(PO4)6(OH)2, HA) with intense photoluminescence (PL) emissions at various HA/AV molar ratios (1:1-1:1/32) by a simple route based on chemical precipitation. The well-defined diffraction peaks observed by X-ray diffraction were all indexed to the monoclinic AV and hexagonal HA phases. Analysis of the results obtained by Fourier transform infrared spectroscopy reveals the presence of short-range structural order as deduced by the characteristic vibrational modes assigned to AV and HA systems. Characterization by scanning and transmission electron microscopies confirms the presence of AV and HA micro- and nanorods, respectively. UV-vis spectroscopy renders band gap energies of 5.80 eV for HA and in the range 2.59-2.65 eV for pure AV and HA/AV samples. The PL data reveal the presence of broad-band emission profiles, typical of defect-related optical centers in materials. Depending on the molar ratio, the emission can be completely tunable from the blue to red spectral regions; in addition, pure white color emission was obtained. On the basis of these results, we propose an order-disorder model induced by structural and interface defects to explain the PL emissions in the HA/AV system. Moreover, our results show that HA/AV composites have superior bactericidal activity against Staphylococcus aureus (methicillin-resistant and methicillin-susceptible) and can be used as a novel multifunctional material.
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Affiliation(s)
- Jussara Soares da Silva
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Thales R Machado
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Tiago A Martins
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Marcelo Assis
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Camila C Foggi
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Nadia G Macedo
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
| | - Héctor Beltrán-Mir
- Departament de Química Inorgànica i Orgànica , Universitat Jaume I (UJI) , 12071 Castellón de la Plana , Castelló , Spain
| | - Eloisa Cordoncillo
- Departament de Química Inorgànica i Orgànica , Universitat Jaume I (UJI) , 12071 Castellón de la Plana , Castelló , Spain
| | - Juan Andrés
- Departament de Química Física i Analítica , Universitat Jaume I (UJI) , 12071 Castellón de la Plana , Castelló , Spain
| | - Elson Longo
- Departamento de Química , CDMF, Universidade Federal de São Carlos (UFSCar) , 13565-905 São Carlos , São Paulo , Brazil
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10
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Tong B, Deng Z, Xu B, Meng G, Shao J, Liu H, Dai T, Shan X, Dong W, Wang S, Zhou S, Tao R, Fang X. Oxygen Vacancy Defects Boosted High Performance p-Type Delafossite CuCrO 2 Gas Sensors. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34727-34734. [PMID: 30207676 DOI: 10.1021/acsami.8b10485] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
p-type ternary oxides can be extensively explored as alternative sensing channels to binary oxides with diverse structural and compositional versatilities. Seeking a novel approach to magnify their sensitivities toward gas molecules, e.g., volatile organic compounds (VOCs), will definitely expand their applications in the frontier area of healthcare and air-quality monitoring. In this work, delafossite CuCrO2 (CCO) nanoparticles with different grain sizes have been utilized as p-type ternary oxide sensors. It was found that singly ionized oxygen vacancies (Vo•) defects, compared with the grain size of CCO nanoparticles, play an important role in enhancing the charge exchange at the VOCs molecules/CCO interface. In addition to suppressing the hole concentration of the sensor channel, the unpaired electron trapped in Vo• provides an active site for chemisorptions of environmental oxygen and VOCs molecules. The synergetic effect is responsible for the observed increase of sensitivity. Furthermore, the sensitive (Vo• defect-rich) CCO sensor exhibits good reproducibility and stability under a moderate operation temperature (<325 °C). Our work highlights that Vo• defects, created via either in situ synthesis or postannealing treatment, could be explored to rationally boost the performance of p-type ternary oxide sensors.
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Affiliation(s)
- Bin Tong
- University of Science and Technology of China , Hefei 230026 , China
| | | | - Bo Xu
- China Pharmaceutical University , Nanjing 211198 , China
| | | | | | - Hongyu Liu
- University of Science and Technology of China , Hefei 230026 , China
| | - Tiantian Dai
- University of Science and Technology of China , Hefei 230026 , China
| | - Xueyan Shan
- University of Science and Technology of China , Hefei 230026 , China
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11
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Maurya A, Bahadur A, Rai SB. Enhanced Upconversion and Downshifting emissions from Tb3+, Yb3+ co-doped CaZrO3 phosphor in presence of Li+ ions. Methods Appl Fluoresc 2018; 7:015002. [PMID: 30275347 DOI: 10.1088/2050-6120/aae58f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
This paper reports the enhanced green photoluminescence from Tb3+, Yb3+ co-doped CaZrO3 phosphor in the presence of Li+ ion synthesized through solid state reaction technique. The structural studies show an increase in the particle size and a shrink in crystal lattice due to Li+ co-doping in the phosphor. The phosphor sample emits intense green upconversion emission (UC) due to Tb3+ ions on excitation with 980 nm radiation which is further enhanced ~ 28 times on Li+ co-doping. The lifetime of 5D4 level of Tb3+ ion decreases in the presence of Li+ ions due to increase in asymmetry in crystal field. The downshifting (DS) emission intensity monitored on 378 and 487nm excitations is also enhanced in the presence of Li+ ions. Thus, the Tb3+, Yb3+, Li+ co-doped CaZrO3 phosphor can be a suitable candidate for UC solid state lighting.
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Affiliation(s)
- Akanksha Maurya
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi-221005, Varanasi, U.P., INDIA
| | - Amresh Bahadur
- Physics, Banaras Hindu University, Institute of Science, Varanasi, Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, U. P., 221005, INDIA
| | - S B Rai
- Laser and Spectroscopy Laboratory Department of Physics, Banaras Hindu University, Varanasi 221 005, Varanasi, 221 005, INDIA
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12
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Gupta SK, Zuniga JP, Ghosh PS, Abdou M, Mao Y. Correlating Structure and Luminescence Properties of Undoped and Eu 3+-Doped La 2Hf 2O 7 Nanoparticles Prepared with Different Coprecipitating pH Values through Experimental and Theoretical Studies. Inorg Chem 2018; 57:11815-11830. [PMID: 30178662 DOI: 10.1021/acs.inorgchem.8b01983] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the structure-property relationship and optimizing properties of phosphors for use in lighting and scintillation fields is an important materials challenge. In this work, we investigated the effects of the pH value of the coprecipitating solution adjusted by the concentration of NH4OH(aq) on the structure and optical properties of the obtained La2Hf2O7 nanoparticles (NPs). The obtained NPs stabilize in the ideal pyrochlore structure, but the extent of ordering increased with an increase in the pH value used. The NPs prepared at pH = 12.1 displayed the best optical performance owing to the balance of the crystallinity, agglomeration, and surface defects. On the basis of density functional theory (DFT) calculations, the origin of violet-blue emission in undoped La2Hf2O7 NPs was attributed to defect states in the electronic band gap arising due to oxygen defects. For the La2Hf2O7:Eu3+ NPs, the Eu3+ dopants possess low symmetry and their occupancy is more favorable at the LaO8 site. DFT calculations further justify the complete host-to-dopant energy transfer and origin of the most intense red emission observed experimentally. Understanding the interplay of the experimental and theoretical results thus is a very useful general approach for improving the efficiency of luminescent materials.
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13
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Oliveira MC, Ribeiro RAP, Gracia L, de Lazaro SR, de Assis M, Oliva M, Rosa ILV, Gurgel MFDC, Longo E, Andrés J. Experimental and theoretical study of the energetic, morphological, and photoluminescence properties of CaZrO3:Eu3+. CrystEngComm 2018. [DOI: 10.1039/c8ce00964c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we present a combined experimental and theoretical study of the geometry, electronic structure, morphology, and photoluminescence properties of CaZrO3:Eu3+ materials.
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Affiliation(s)
- Marisa Carvalho Oliveira
- Department of Analytical and Physical Chemistry
- Universitat Jaume I
- Castelló E-12071
- Spain
- CDMF-UFSCar
| | | | - Lourdes Gracia
- Department of Physical Chemistry
- Universitat de Valencia
- Burjassot E-46100
- Spain
| | - Sergio R. de Lazaro
- Department of Chemistry
- Universidade Estadual de Ponta Grossa
- Ponta Grossa
- Brazil
| | - Marcelo de Assis
- CDMF-UFSCar
- Universidade Federal de São Carlos
- 13565-905 São Carlos
- Brazil
| | - Mónica Oliva
- Department of Analytical and Physical Chemistry
- Universitat Jaume I
- Castelló E-12071
- Spain
| | | | | | - Elson Longo
- CDMF-UFSCar
- Universidade Federal de São Carlos
- 13565-905 São Carlos
- Brazil
| | - Juan Andrés
- Department of Analytical and Physical Chemistry
- Universitat Jaume I
- Castelló E-12071
- Spain
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14
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Banerjee D, Gupta SK, Patra N, Raja SW, Pathak N, Bhattacharyya D, Pujari PK, Thakare SV, Jha SN. Unraveling doping induced anatase–rutile phase transition in TiO2 using electron, X-ray and gamma-ray as spectroscopic probes. Phys Chem Chem Phys 2018; 20:28699-28711. [DOI: 10.1039/c8cp04310h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work reports the microscopic details of anatase (A) to rutile (R) phase transformation in a Mn-doped TiO2 system.
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Affiliation(s)
- D. Banerjee
- Accelerator Chemistry Section
- Radiochemistry Division (BARC)
- Variable Energy Cyclotron Centre
- Kolkata-700064
- India
| | - Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - N. Patra
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Sk Wasim Raja
- Accelerator Chemistry Section
- Radiochemistry Division (BARC)
- Variable Energy Cyclotron Centre
- Kolkata-700064
- India
| | - N. Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - D. Bhattacharyya
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. K. Pujari
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - S. V. Thakare
- Radiopharmaceuticals Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - S. N. Jha
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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15
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Machado TR, Sczancoski JC, Beltrán-Mir H, Nogueira IC, Li MS, Andrés J, Cordoncillo E, Longo E. A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles. J SOLID STATE CHEM 2017. [DOI: 10.1016/j.jssc.2016.12.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Pathak N, Gupta SK, Prajapat CL, Sharma SK, Ghosh PS, Kanrar B, Pujari PK, Kadam RM. Defect induced ferromagnetism in MgO and its exceptional enhancement upon thermal annealing: a case of transformation of various defect states. Phys Chem Chem Phys 2017; 19:11975-11989. [DOI: 10.1039/c7cp01776f] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Micron size MgO particles showed various defect induced ferromagnetism with an exceptional enhancement upon thermal annealing due to transformation of one kind of cluster vacancy to another.
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Affiliation(s)
- Nimai Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | | | - C. L. Prajapat
- Technical Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - S. K. Sharma
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - P. S. Ghosh
- Homi Bhabha National Institute
- Mumbai
- India
- Materials Science Division
- Bhabha Atomic Research Centre
| | - Buddhadev Kanrar
- Homi Bhabha National Institute
- Mumbai
- India
- Fuel Chemistry Division
- Bhabha Atomic Research Centre
| | - P. K. Pujari
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
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17
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Gupta SK, Ghosh PS, Yadav AK, Jha SN, Bhattacharyya D, Kadam RM. Origin of Blue-Green Emission in α-Zn 2P 2O 7 and Local Structure of Ln 3+ Ion in α-Zn 2P 2O 7:Ln 3+ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements. Inorg Chem 2016; 56:167-178. [PMID: 27966936 DOI: 10.1021/acs.inorgchem.6b01788] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Considering the fact that pyrophosphate-based hosts are in high demand for making highly efficient luminescence materials, we doped two visible lanthanide ions, viz. Sm3+ and Eu3+, in Zn2P2O7. Interestingly, it was oberved that pure Zn2P2O7 displayed blue-green dual emission on irradiation with ultraviolet light. Emission and lifetime spectroscopy shows the presence of defects in pyrophosphate samples which are responsible for such emission. DFT calculations clearly pinpointed that the electronic transitions between defect states located at just below the conduction band minimum (arises due to VO1+ and VO2+ defects) and valence band maximum, as well as impurity states situated in the band gap, can lead to dual emission in the blue-green region, as is also indicated by emission and lifetime spectra. X-ray absorption near edge spectroscopy (XANES) shows the stabilization of europium as well as samarium ion in the +3 oxidation state in α-Zn2P2O7. The fact that α-Zn2P2O7 has two different coordination numbers for zinc ions, i.e. five- and six-coordinate, the study of dopant ion distribution in this particular matrix will be an important step in realizing a highly efficient europium- and samarium-based red-emitting phosphor. Time resolved photoluminescence (TRPL) shows that both of these ions are heterogeneously distributed between five- and six-coordinated Zn2+ sites and it is the six-coordinated Zn2+ site which is the most favorable for lanthanide ion doping. Extended X-ray absorption fine structure (EXAFS) measurements also suggested that a six-coordinated zinc ion is the preferred site occupied by trivalent lanthanide ions, which is in complete agreement with TRPL results. It was observed that there is almost complete transfer of photon energy from Zn2P2O7 to Eu3+, whereas this transfer is inefficient and almost incomplete in case of Sm3+, which is indeed important information for the realization of pyrophosphate-based tunable phosphors.
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Affiliation(s)
- Santosh Kumar Gupta
- Radiochemistry Division, ‡Materials Science Division, and §Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai 400085, India
| | - Partha Sarathi Ghosh
- Radiochemistry Division, ‡Materials Science Division, and §Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai 400085, India
| | - Ashok Kumar Yadav
- Radiochemistry Division, ‡Materials Science Division, and §Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai 400085, India
| | - Shambhu Nath Jha
- Radiochemistry Division, ‡Materials Science Division, and §Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai 400085, India
| | - Dibyendu Bhattacharyya
- Radiochemistry Division, ‡Materials Science Division, and §Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai 400085, India
| | - Ramakant Mahadeo Kadam
- Radiochemistry Division, ‡Materials Science Division, and §Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai 400085, India
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18
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Pathak N, Ghosh PS, Gupta SK, Kadam RM, Arya A. Defects induced changes in the electronic structures of MgO and their correlation with the optical properties: a special case of electron–hole recombination from the conduction band. RSC Adv 2016. [DOI: 10.1039/c6ra21065a] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Defect induced tunable emission in MgO is investigated using photoluminescence and DFT calculations.
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Affiliation(s)
- Nimai Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | - Partha Sarathi Ghosh
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | | | - Ramakant Mahadeo Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | - Ashok Arya
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
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19
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Maurya A, Yadav RS, Yadav RV, Rai SB, Bahadur A. Enhanced green upconversion photoluminescence from Ho3+/Yb3+ co-doped CaZrO3 phosphor via Mg2+ doping. RSC Adv 2016. [DOI: 10.1039/c6ra23835a] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper reports enhanced green upconversion photoluminescence from Ho3+/Yb3+ co-doped CaZrO3 phosphor via Mg2+ doping synthesized through a solid state reaction method.
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Affiliation(s)
- A. Maurya
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi 221 005
- India
| | - R. S. Yadav
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi 221 005
- India
| | - R. V. Yadav
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi 221 005
- India
| | - S. B. Rai
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi 221 005
- India
| | - A. Bahadur
- Department of Physics
- Institute of Science
- Banaras Hindu University
- Varanasi 221 005
- India
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20
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Gupta SK, Reghukumar C, Kadam RM. Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties. RSC Adv 2016. [DOI: 10.1039/c6ra11698a] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
New Color tunable Nd2Zr2O7:Eu3+ (0–5 mol%) phosphor was synthesized using gel-combustion and its photophysical characteristics such as energy transfer, point group symmetry and Judd–Ofelt parameter were investigated using time resolved photoluminescence.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - C. Reghukumar
- Institute of Science Education and Research Centre
- Santiniketan
- India
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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21
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Gupta SK, Ghosh PS, Sudarshan K, Gupta R, Pujari PK, Kadam RM. Multifunctional pure and Eu3+ doped β-Ag2MoO4: photoluminescence, energy transfer dynamics and defect induced properties. Dalton Trans 2015; 44:19097-110. [DOI: 10.1039/c5dt03113c] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photoluminescence and electrocatalytic properties of pure and europium doped β-Ag2MoO4 are explored. The host dopant energy transfer process is explained theoretically.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. S. Ghosh
- Materials Science Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - K. Sudarshan
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Ruma Gupta
- Fuel Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. K. Pujari
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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