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Devi P, Sehrawat P, Dalal H, Sheoran M, Kumari N, Malik RK. Crystal Phase Refinement and Optical Features of Highly Efficient Green Light Radiating Ca 9Y(VO 4) 7: Er 3+ Nanophosphors for Emerging Solid-state Lighting Applications. J Fluoresc 2024; 34:1241-1252. [PMID: 37523137 DOI: 10.1007/s10895-023-03356-3] [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: 05/31/2023] [Accepted: 07/18/2023] [Indexed: 08/01/2023]
Abstract
Ca9Y(VO4)7 phosphor activated with Er3+ ions have been developed by the urea-aided solution combustion technique. XRD profiles assisted with Rietveld refinement executed over-developed Er3+-activated Ca9Y(VO4)7 powder, revealed a trigonal phase with the R3c space group. The electron microscope techniques namely TEM and SEM characterize the size and surface-linked qualities of the developed nanopowder, respectively. The uniform distribution of various elements in the nanocrystalline sample is authenticated by an energy-dispersive spectroscopy (EDS) system. The Eg (band gap) value of 3.64 eV for Ca9Y0.9Er0.1(VO4)7 and 3.74 eV for Ca9Y(VO4)7 has been estimated. Upon 382 nm excitation, Er3+: Ca9Y(VO4)7 phosphor gives rise to the bright green emission owing to the 4S3/2 → 4I15/2 transition. The concentration quenching after 10 mol% composition of trivalent erbium ions is attributed to dipole-dipole interlinkages in accordance with Dexter's theory. The radiative lifetime (1.1083 ms), non-radiative rates (0.2079 ms- 1), quantum efficiency (79%), along with colorimetric parameters i.e. CIE x (= 0.2577), y (= 0.4566), and CCT quantities offer Ca9Y0.9Er0.1(VO4)7 as a proficient green radiating nanomaterial for RGB phosphors in solid-state applications.
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Affiliation(s)
- Poonam Devi
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Priyanka Sehrawat
- Department of Chemistry, Aggarwal College, 121004, Ballabgarh, Faridabad, India
| | - Hina Dalal
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Monika Sheoran
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Neelam Kumari
- Department of Chemistry, Meerut College, Ch. Charan Singh University, Meerut, 250001, India
| | - Rajesh Kumar Malik
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India.
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Paikaray R, Badapanda T, Sahoo S, Mohapatra H. Exploration of Photoluminescence, Colorimetric, and Decay Performance of Sm-activated CaWO 4 Ceramic. J Fluoresc 2024:10.1007/s10895-024-03643-7. [PMID: 38520622 DOI: 10.1007/s10895-024-03643-7] [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: 01/03/2024] [Accepted: 02/26/2024] [Indexed: 03/25/2024]
Abstract
This paper represents structure, photoluminescence, and colorimetric investigations of Sm-activated CaWO4 ceramic made with the help of a solid-state reaction process. Structures of the ceramics are examined through X-ray diffraction spectroscopy. It indicates that these materials have a tetragonal structure and I41/a space group without having any other secondary phase. Energy band gaps are increased with the higher concentrations of Sm dopants. Photoluminescence analyses show that concentration quenching is found at x = 0.02 Sm incorporated CaWO4. The critical distance of energy transfer is obtained as about 20 Å. Q-value is observed approximately equal to 6 which denotes that dipole-dipole interactions occur in the materials that create the critical energy transfer distance in them. Chromaticity values are described in that the ceramics emit orange-red color as well as excellent colorimetric parameters. Quantum efficiency of x = 0.02 Sm composition in CaWO4 is measured under 405 nm EX wavelength. Photoluminescence decay behaviors are observed and average lifetime values are evaluated.
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Affiliation(s)
- R Paikaray
- Department of Physics, C.V. Raman Global University, Bhubaneswar, Odisha, 752054, India
| | - T Badapanda
- Department of Physics, C.V. Raman Global University, Bhubaneswar, Odisha, 752054, India.
| | - S Sahoo
- Department of Physics, Odisha University of Technology and Research, Bhubaneswar, 751029, Odisha, India
| | - H Mohapatra
- Department of Physics, C.V. Raman Global University, Bhubaneswar, Odisha, 752054, India
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Xiao H, Meng Q. Eu 3+ doped CaWO 4 nanophosphor for high sensitivity optical thermometry. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 305:123542. [PMID: 37857071 DOI: 10.1016/j.saa.2023.123542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 09/28/2023] [Accepted: 10/14/2023] [Indexed: 10/21/2023]
Abstract
Eu3+ doped calcium tungstate phosphors were obtained by using sodium citrate as chelating agent in hydrothermal process. The structure and morphology of the samples were indicated by XRD and the FE-SEM. The samples prepared by us are scheelite structure. In addition, the particle size of sample decreases with sodium citrate dosage increasing, and finally reaches the nanoscale. The average particle size is 90 nm. The temperature measurement properties of phosphors were tested. It can be seen from test results that the thermal quenching behavior of Eu3+ and WO42- luminescence has obvious difference. Hence, the FIR of Eu3+ and WO42- can be used to express temperature. The maximum relative sensitivity increases with the decrease of particle size and the maximum is 4.3% K-1 (303 K, 90 nm). Moreover, the color of sample luminescence altered continuously from blue to pink-red as the temperature increased. The luminous color of the sample can be used to roughly estimate the temperature. Therefore, the CaWO4: Eu3+ nanophosphor are promising materials for optical thermometry.
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Affiliation(s)
- Haihong Xiao
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China
| | - Qingyu Meng
- Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China.
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Ram T, Verma N, Kaur J, Misra AK, Dubey V, Dubey N, Michalska-Domańska M, Saji J, Yadav RS. Estimation of spectroscopic parameters and TL glow curve analysis of Eu 3+-activated CaY 2O 4 phosphor. RSC Adv 2023; 13:26357-26365. [PMID: 37671341 PMCID: PMC10476512 DOI: 10.1039/d3ra03200k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 08/04/2023] [Indexed: 09/07/2023] Open
Abstract
The solid-state reaction method was utilised to create a down-conversion phosphor in an air environment in CaY2O4:Eu3+ nanocrystalline material. The calcination temperature was set at 1000 °C, and the sintering temperature was set at 1300 °C. Following annealing, confirmation of the crystallinity quality of the phosphor was accomplished by the use of X-ray diffraction analysis. The particle size was predicted to be 43.113 nm using Scherrer's formula. To produce down-conversion luminescence spectra, an excitation wavelength of 247 nm was applied with a fluorescence spectrophotometer. The PL got increasingly intense as the concentration of the dopant increased. The maximum intensity was measured at 2.0 mol% of Eu3+ ion, which gradually decreased as the concentration increased because of concentration quenching. To analyse spectrophotometric peak determinations, the approach developed by the Commission Internationale de l'Éclairage (CIE) was used. Thermoluminescence (TL) glow curve analysis of the CaY2O4:Eu3+-doped phosphor manufactured here revealed a wide TL centred at 225 °C, which comprised of so many peaks that may be extracted by the computerised glow curve deconvolution (CGCD) approach using glow-fit software. The associated kinetic parameters were then determined. The prepared phosphor may be useful for application in various display devices upon excitation by 247 nm; the prominent 613 nm peak of the Eu3+ ion (5D0 → 7F2) electric dipole transition features a red component. CaY2O4:Eu3+ phosphors show promise as materials for potential use in phosphor-converted white LEDs in the field of solid-state lighting technology. The linear connection that the TL glow curve has with UV dose provides evidence for its possible use in dosimetry.
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Affiliation(s)
- Tirath Ram
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Neeraj Verma
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Jagjeet Kaur
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Abhishek Kumar Misra
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Vikas Dubey
- Department of Physics, North Eastern Hill University (NEHU) Shillong Meghalaya 493022 India
| | - Neha Dubey
- Department of Physics, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg C.G. India
| | - Marta Michalska-Domańska
- Institute of Optoelectronics, Military University of Technology Kaliskiego 2 00-908 Warsaw Mazovia Poland
| | - Janita Saji
- Department of Sciences and Humanities, School of Engineering and Technology CHRIST (Deemed to be University) Bangalore India
| | - Ram Sagar Yadav
- Department of Statistics, Institute of Science, Banaras Hindu University Varanasi 221005 India
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Mamatha G, Radha Krushna B, Malleshappa J, Subramanian B, Daruka Prasad B, Srikanth C, Nagabhushana H. Designing orange-red emitting luminescent platform for data security and information encryption based Sm3+ doped BLAO phosphor. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Mishra S, Chakinala N, Chakinala AG, Surolia PK. Photocatalytic degradation of methylene blue using monometallic and bimetallic Bi-Fe doped TiO2. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2022.106518] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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Saloni, Kaur P, Sharma S, Khanna A. Synthesis and characterization of Sm, Dy and Er-doped β-Ca3(PO4)2 phosphors. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02497-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Calcium Tungstate Doped with Rare Earth Ions Synthesized at Low Temperatures for Photoactive Composite and Anti-Counterfeiting Applications. CRYSTALS 2021. [DOI: 10.3390/cryst11101214] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A precursor was prepared using a co-precipitation method to synthesize crystalline calcium tungstate. The prepared precursor was dried in an oven at 80 °C for 18 h. The dried powders, prepared without a heat treatment process, were observed in XRD analysis to be a crystalline CaWO4 phase, confirming that the synthesis of crystalline CaWO4 is possible even at low temperature. To use this crystalline CaWO4 as a light emitting material, rare earth ions were added when preparing the precursor. The CaWO4 powders doped with terbium (Tb3+) and europium (Eu3+) ions, respectively, were also observed to be crystalline in XRD analysis. The luminescence of the undoped CaWO4 sample exhibited a wide range of 300~600 nm and blue emission with a central peak of 420 nm. The Tb3+-doped sample showed green light emission at 488, 545, 585, and 620 nm, and the Eu3+-doped sample showed red light emission at 592, 614, 651, and 699 nm. Blue, green, and red CaWO4 powders with various luminescence properties were mixed with glass powder and heat-treated at 600 °C to fabricate a blue luminescent PiG disk. In addition, a flexible green and red light-emitting composite was prepared by mixing it with a silicone-based polymer. An anti-counterfeiting application was prepared by using the phosphor in an ink, which could not be identified with the naked eye but can be identified under UV light.
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9
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Probing into multifunctional deep orange-red emitting Sm3+-activated zincate based nanomaterials for wLED applications. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138743] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Sheoran M, Sehrawat P, Kumari N, Khatkar S, Malik R. Cool white light emanation and photo physical features of combustion derived Dy3+ doped ternary yttrate oxide based nanophosphors for down converted WLEDs. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138608] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Sehrawat P, Khatkar A, Boora P, Singh S, Kumar M, Malik R, Khatkar S, Taxak V. Structural, spectroscopic and optical analysis of green-glowing BaLaAlO4:Er3+ nanomaterials for photonic applications. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.138004] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Sehrawat P, Khatkar A, Boora P, Kumar M, Malik R, Khatkar S, Taxak V. Combustion derived color tunable Sm3+ activated BaLaAlO4 nanocrystals for various innovative solid state illuminants. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137937] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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13
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Ghorpade SP, Kottam N, Melavanki R, Patil NR. Photoluminescence, TGA/DSC and photocatalytic activity studies of Dy 3+ doped SrY 2O 4 nanophosphors. RSC Adv 2020; 10:21049-21056. [PMID: 35518739 PMCID: PMC9054282 DOI: 10.1039/d0ra03094e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 05/12/2020] [Indexed: 11/28/2022] Open
Abstract
Dy3+:SrY2O4 nanophosphors were prepared via a solution combustion method using glycine as an organic fuel. The structural, optical, and thermal properties of the nanophosphors were studied. Strain and crystal size were calculated via W-H analysis. The direct energy band gap is nearly 4.9 eV and photocatalytic studies reveal that Rh-B degradation of almost 50% can be achieved.
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Affiliation(s)
- Santosh P Ghorpade
- Dept. of Physics, P. C. Jabin Science College Vidyanagar Hubli-580031 Karnataka India
- Dept. of Physics, B. V. B. College of Engg. & Tech. Vidyanagar Hubli-580031 Karnataka India
- Dept. of Physics, Visvesvaraya Technological University Belagavi-590018 Karnataka India
| | - Nagaraju Kottam
- Dept. of Chemistry, MS Ramaiah Institute of Technology (Affiliated to Visvesvaraya Technological University, Belagavi) Bangalore-560054 Karnataka India
| | - Raveendra Melavanki
- Dept. of Physics, MSRIT Bangalore-560054 Karnataka India
- Dept. of Physics, Visvesvaraya Technological University Belagavi-590018 Karnataka India
| | - N R Patil
- Dept. of Physics, B. V. B. College of Engg. & Tech. Vidyanagar Hubli-580031 Karnataka India
- Dept. of Physics, Visvesvaraya Technological University Belagavi-590018 Karnataka India
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Nayak P, Nanda SS, Sharma R, Dash S. Tunable luminescence of Eu
3+
‐activated CaWO
4
nanophosphors via Bi
3+
incorporation. LUMINESCENCE 2020; 35:1068-1076. [DOI: 10.1002/bio.3818] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/16/2020] [Accepted: 04/15/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Priyanka Nayak
- Department of Physics and Astronomy National Institute of Technology Rourkela Rourkela Odisha India
| | - Sushri Sangita Nanda
- Department of Physics and Astronomy National Institute of Technology Rourkela Rourkela Odisha India
| | - R.K. Sharma
- Indus 2 Synchrotron Facility Raja Ramanna Centre for Advanced Technology (RRCAT) Madhya Pradesh India
| | - S. Dash
- Department of Physics and Astronomy National Institute of Technology Rourkela Rourkela Odisha India
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15
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Influence of Sm3+ concentration on structural and spectroscopic properties of orange-red emitting PbWO4 phosphor: An energy transfer study. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121190] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Sehrawat P, Khatkar A, Devi S, Hooda A, Singh S, Malik R, Khatkar S, Taxak V. An effective emission of characteristic cool white light from Dy3+ doped perovskite type SrLa2Al2O7 nanophosphors in single-phase pc WLEDs. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136842] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Gupta S, Abdou M, Zuniga JP, Puretzky AA, Mao Y. Samarium-Activated La 2Hf 2O 7 Nanoparticles as Multifunctional Phosphors. ACS OMEGA 2019; 4:17956-17966. [PMID: 31720499 PMCID: PMC6843720 DOI: 10.1021/acsomega.9b01318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 10/07/2019] [Indexed: 05/07/2023]
Abstract
Recent developments in the field of designing novel nanostructures with various functionalities have pushed the scientific world to design and develop high-quality nanomaterials with multifunctional applications. Here, we propose a new kind of doped metal oxide pyrochlore nanostructure for solid-state phosphor, X-ray scintillator, and optical thermometry. The developed samarium-activated La2Hf2O7 (LHOS) nanoparticles (NPs) emit a narrow and stable red emission with lower color temperature and adequate critical distance under near-UV and X-ray excitations. When the LHOS NPs are exposed to an energetic X-ray beam, the Sm3+ ions situated at the symmetric environment get excited along with those located at the asymmetric environment, which results in a low asymmetry ratio of Sm3+ under radioluminescence compared to photoluminescence. High activation energy and adequate thermal sensitivity of the LHOS NPs highlight their potential as a thermal sensor. Our results indicate that these Sm3+-activated La2Hf2O7 NPs can serve as a multifunctional UV, X-ray, and thermographic phosphor.
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Affiliation(s)
- Santosh
K. Gupta
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
- Radiochemistry
Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Maya Abdou
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
| | - Jose P. Zuniga
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
| | - Alexander A. Puretzky
- Center
for Nanophase Materials Sciences, Oak Ridge
National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yuanbing Mao
- Department
of Chemistry and School of Earth, Environmental, and Marine
Sciences, University of Texas Rio Grande
Valley, 1201 West University Drive, Edinburg, Texas 78539, United States
- E-mail: , . Phone: +1-312-567-3815, +1 956 665 2986, Fax: +1 956 665 5006
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Singh V, Seshadri M, Pathak MS, Singh N. Sm 3+ doped calcium orthovanadate Ca 3(VO 4) 2 - A spectral study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 217:315-321. [PMID: 30954718 DOI: 10.1016/j.saa.2019.03.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 03/15/2019] [Accepted: 03/17/2019] [Indexed: 06/09/2023]
Abstract
Sm3+-doped vanadate-based phosphors, Ca3-x (VO4)2:Smx(x = 0.005 ≤ x ≤ 0.095), were synthesized by the citrate-based sol-gel method. The samples were characterized with XRD, SEM, diffuse reflectance and photoluminescence spectroscopy, aiming at the development of phosphor-converted wLED applications. Using diffuse reflectance spectra and the Kubelka-Munk function, the band gap energy was calculated to be 3.28 eV for the Ca2.95(VO4)2:Sm0.05 phosphor. Observation of the photoluminescence excitation spectra revealed a broadband excitation from the distorted VO4 tetrahedron and a few narrow peaks from the 4f-4f intra-configuration transitions of the Sm3+ ions. Upon 404 nm excitation, 4G5/2 → 6H5/2 (564 nm), 4G5/2 → 6H7/2 (601 nm), 4G5/2 → 6H9/2 (648 nm) and 4G5/2 → 6H11/2 (701 nm) transitions were observed. The optimum Sm3+ concentration for the studied phosphor is 0.05 mol, and the estimated critical distance between Sm3+ ions (Rc) is 19.1 Å. The observed quenching of Sm3+ emission is attributed to the dipole-dipole interactions. The possible cross-relaxation process between neighboring Sm3+ ions was discussed in detail. The CIE coordinates were calculated for all the samples, and they set on the orange region of CIE diagram. In addition, pure orange color emission was observed under 365 nm UV lamp. The results suggest that the Ca3(VO4)2:Sm3+ phosphor could be a good candidate for the orange emitting component for wLED applications.
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Affiliation(s)
- Vijay Singh
- Department of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea.
| | - M Seshadri
- Department of Physics, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil
| | - M S Pathak
- Department of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea
| | - N Singh
- Department of Chemical Engineering, Konkuk University, Seoul 05029, Republic of Korea
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Kim J, Do JY, Park NK, Hong JP, Kang M. Adsorption/desorption behavior of carbonyl sulfide gas on Scheelite type MWO4 adsorbent. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.06.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Microemulsion‐Mediated Synthesis and Properties of Uniform Ln:CaWO
4
(Ln = Eu, Dy) Nanophosphors with Multicolor Luminescence for Optical and CT Imaging. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700650] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Ningombam GS, Singh NR, Ningthoujam RS. Controlled synthesis of CaWO4:Sm3+ microsphere particles by a reverse-micelle method and their energy transfer rate in luminescence. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.01.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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22
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Tunable Luminescence in Sr2MgSi2O7:Tb3+, Eu3+Phosphors Based on Energy Transfer. MATERIALS 2017; 10:ma10030227. [PMID: 28772587 PMCID: PMC5503325 DOI: 10.3390/ma10030227] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 02/17/2017] [Indexed: 11/17/2022]
Abstract
A series of Tb3+, Eu3+-doped Sr2MgSi2O7 (SMSO) phosphors were synthesized by high temperature solid-state reaction. X-ray diffraction (XRD) patterns, Rietveld refinement, photoluminescence spectra (PL), and luminescence decay curves were utilized to characterize each sample’s properties. Intense green emission due to Tb3+5D4→7F5 transition was observed in the Tb3+ single-doped SMSO sample, and the corresponding concentration quenching mechanism was demonstrated to be a diople-diople interaction. A wide overlap between Tb3+ emission and Eu3+ excitationspectraresults in energy transfer from Tb3+ to Eu3+. This has been demonstrated by the emission spectra and decay curves of Tb3+ in SMSO:Tb3+, Eu3+ phosphors. Energy transfer mechanism was determined to be a quadrupole-quadrupole interaction. And critical distance of energy transfer from Tb3+ to Eu3+ ions is calculated to be 6.7 Å on the basis of concentration quenching method. Moreover, white light emission was generated via adjusting concentration ratio of Tb3+ and Eu3+ in SMSO:Tb3+, Eu3+ phosphors. All the results indicate that SMSO:Tb3+, Eu3+ is a promising single-component white light emitting phosphor.
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Zhang JC, Liu YJ, Yan X, Zhang HD, Zhang J, Wang X, Han WP, Long YZ, Sun XY. Multicolor Tuning in Room-Temperature Self-Activated Ca 2 Nb 2 O 7 Submicroplates by Lanthanide Doping. Chemphyschem 2017; 18:269-273. [PMID: 27902871 DOI: 10.1002/cphc.201600998] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 11/29/2016] [Indexed: 11/08/2022]
Abstract
Self-activated phosphors are capable of generating optical emissions from the internal ion groups of host lattice before externally introducing luminescent ions. However, numerous self-activated phosphors only show luminescence at low temperature due to the thermally activated energy migration among ion groups at room temperature, severely confining their application conditions. In this letter, we propose a strategy to converting the low-temperature luminescence to a room-temperature one through changing the synthesis conditions to induce structural distortions and thus to limit energy migration. Room-temperature self-activated luminescence of Ca2 Nb2 O7 was accordingly achieved in submicroplates synthesized using the sol-gel method. By further coupling the blue broadband emission from Ca2 Nb2 O7 submicroplates with the characteristic luminescence of Ln3+ (Pr3+ , Sm3+ , and Dy3+ ) dopants, multicolor emissions were successively tuned through adjusting the concentration of Ln3+ . Our results are expected to expand the scope of designing room-temperature self-activated phosphors and tuning multicolor emission.
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Affiliation(s)
- Jun-Cheng Zhang
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Yan-Jie Liu
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Xu Yan
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Hong-Di Zhang
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Jun Zhang
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Xiaoxiong Wang
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Wen-Peng Han
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Yun-Ze Long
- College of Physics, Qingdao University, Qingdao, 266071, China
| | - Xin-Yuan Sun
- Department of Physics, Jinggangshan University, Ji'an, 343009, China
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24
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Mahalingam V, Thirumalai J. Facile hydrothermal synthesis and pulsed laser deposition of Ca0.5Y1−x(WO4)2:xEu3+ phosphors: investigations on the luminescence, Judd–Ofelt analysis and charge compensation mechanism. NEW J CHEM 2017. [DOI: 10.1039/c6nj02975b] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PL emission spectra of Ca0.5Y1−x(WO4)2:xEu3+ for powder and thin film phosphors, and PL spectra of Ca0.5Y1−x(WO4)2:xEu3+ co-doped with alkali metal ions.
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25
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Fan L, Li Y, Lin X, Peng J, Ju G, Zhang S, Chen L, He F, Hu Y. Tailoring light emission properties and optoelectronic and optothermal responses from rare earth-doped bismuth oxide for multifunctional light shielding, temperature sensing, and photodetection. RSC Adv 2017. [DOI: 10.1039/c7ra08490k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have developed an all-purpose material with tunable light emission property and controllable optoelectronic and optothermal response processes.
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Affiliation(s)
- Liumin Fan
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Yang Li
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
- State Key Laboratory of Luminescent Materials and Devices
| | - Xiaohui Lin
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Junhao Peng
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Guifang Ju
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Shaoan Zhang
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
- Guangzhou Maritime University
| | - Li Chen
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Fupo He
- School of Electromechanical Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
| | - Yihua Hu
- School of Physics and Optoelectronic Engineering
- Guangdong University of Technology
- Guangzhou 510006
- China
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26
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Zhang DJ, Zhang JC, Zhou JY, Cai SS, Gao Y, Yuan BQ, Zhang RC. Synthesis and the temperature-dependent luminescent properties of SrWO4:Eu3+ ultralong nanowire phosphors. INORG CHEM COMMUN 2016. [DOI: 10.1016/j.inoche.2016.07.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Nair GB, Dhoble SJ. Photoluminescence properties of Eu3+/ Sm3+ activated CaZr4(PO4)6 phosphors. J Fluoresc 2016; 26:1865-73. [DOI: 10.1007/s10895-016-1880-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 07/06/2016] [Indexed: 11/28/2022]
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28
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Aloysius Sabu N, Priyanka K, Ganesh S, Varghese T. Modifications in the structural and optical properties of nanocrystalline CaWO4 induced by 8MeV electron beam irradiation. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2016.02.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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29
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Zhang B, Zou H, Guan H, Dai Y, Song Y, Zhou X, Sheng Y. Lu2O2S:Tb3+, Eu3+nanorods: luminescence, energy transfer, and multicolour tuneable emission. CrystEngComm 2016. [DOI: 10.1039/c6ce01441k] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Zhang Y, Gong W, Yu J, Cheng Z, Ning G. Multi-color luminescence properties and energy transfer behaviour in host-sensitized CaWO4:Tb3+,Eu3+phosphors. RSC Adv 2016. [DOI: 10.1039/c6ra01862a] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
A series of host-sensitized and color-tunable CaWO4:Tb3+,Eu3+phosphors have been successfully synthesizedviathe high-temperature solid-state reaction route and their photoluminescence properties and energy transfer mechanism have been carefully investigated.
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Affiliation(s)
- Yang Zhang
- State Key Laboratory of Fine Chemicals and School of Chemical Engineering
- Dalian University of Technology
- Dalian 116012
- P. R. China
| | - Weitao Gong
- State Key Laboratory of Fine Chemicals and School of Chemical Engineering
- Dalian University of Technology
- Dalian 116012
- P. R. China
| | - Jingjie Yu
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian
- P. R. China
| | - Zhiyuan Cheng
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian
- P. R. China
| | - Guiling Ning
- State Key Laboratory of Fine Chemicals and School of Chemical Engineering
- Dalian University of Technology
- Dalian 116012
- P. R. China
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31
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Culver SP, Brutchey RL. Lanthanide-activated scheelite nanocrystal phosphors prepared by the low-temperature vapor diffusion sol–gel method. Dalton Trans 2016; 45:18069-18073. [DOI: 10.1039/c6dt03382b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The high degree of synthetic flexibility inherent to the vapor diffusion sol–gel method has enabled the synthesis of a CaWO4:(Eu,Tb) dual-sensitized white light emitting nanocrystal phosphor.
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Affiliation(s)
- Sean P. Culver
- Department of Chemistry
- University of Southern California
- Los Angeles
- USA
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32
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Singh BP, Maheshwary M, Ramakrishna PV, Singh S, Sonu VK, Singh S, Singh P, Bahadur A, Singh RA, Rai SB. Improved photo-luminescence behaviour of Eu3+ activated CaMoO4 nanoparticles via Zn2+ incorporation. RSC Adv 2015. [DOI: 10.1039/c5ra06692a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Zn2+ (0, 2, 5, 7 and 10 at%) co-doped CaMoO4:2Eu3+ nanophosphors have been synthesized via the polyol method using ethylene glycol (EG) as both capping agent and reaction medium at 150 °C.
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Affiliation(s)
- B. P. Singh
- Department of Physics
- IIT (BHU)
- Varanasi-221005
- India
| | | | | | | | - V. K. Sonu
- Centre for Advanced Studies in Chemistry
- North Eastern Hill University
- Shillong-793022
- India
| | - Santosh Singh
- Department of Pure and Applied Physics
- Guru Ghasidas University
- Bilaspur
- India-495009
| | - P. Singh
- Department of Physics
- IIT (BHU)
- Varanasi-221005
- India
| | - A. Bahadur
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
| | - R. A. Singh
- Department of Physics
- Dr. H. S. Gour Central University
- Sagar
- India
| | - S. B. Rai
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
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