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Mukherjee S, Pathak N, Ali K, Das D, Dutta D. Tailoring defect structure and dopant composition and the generation of various color characteristics in Eu 3+ and Tb 3+ doped MgF 2 phosphors. Phys Chem Chem Phys 2022; 24:10915-10927. [PMID: 35452069 DOI: 10.1039/d2cp01031c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel approach to generate a wide range of color characteristics such as near white, yellow, orange and red in MgF2, by proper tailoring of the defect structure and varying the composition of Eu3+ and Tb3+ dopant ions have been presented here. It has been observed from positron annihilation lifetime spectroscopy (PALS) study that various defect centers such as mono vacancies and their cluster forms exist in the system, whose amount varies upon varying the dopant ion's composition. The experimentally observed positron lifetime values of the defect centers also matched well with the theoretically calculated lifetime values using the MIKA-DOPPLER package. It has been found that a few vacancies or defect centers act as color centers, while the cluster vacancies change the local symmetry of the rare earth ion by inducing more distortion surrounding them thereby resulting in different emission characteristics in the photoluminescence (PL) study. The defect-related host emission in combination with the green and red emission from Tb3+ and Eu3+ ions generated near-white-light in some of the compounds, while other compounds showed a variety of other color characteristics due to the Tb3+ → Eu3+energy transfer dynamics. The various defect-related emissions, the role of the defect-related trap state in the decay kinetics and the energy-transfer dynamics were also understood by analyzing the electronic structure using HSE06 hybrid functional calculation.
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Affiliation(s)
- Sumanta Mukherjee
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Nimai Pathak
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| | - Kawsar Ali
- Glass and Advanced Materials Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Debarati Das
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Dhanadeep Dutta
- Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.,Homi Bhabha National Institute, Mumbai, 400085, India
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Jiang P, Li Z, Lu W, Ma Y, Tian W. The pH Value Control of Morphology and Luminescence Properties of Gd 2O 2S: Tb 3+ Phosphors. MATERIALS (BASEL, SWITZERLAND) 2022; 15:646. [PMID: 35057363 PMCID: PMC8779210 DOI: 10.3390/ma15020646] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/07/2022] [Accepted: 01/12/2022] [Indexed: 02/05/2023]
Abstract
Developing rare-earth doped oxysulfide phosphors with diverse morphologies has significant value in many research fields such as in displays, medical diagnosis, and information storage. All of the time, phosphors with spherical morphology have been developed in most of the related literatures. Herein, by simply adjusting the pH values of the reaction solution, Gd2O2S:Tb3+ phosphors with various morphologies (sphere-like, sheet-like, cuboid-like, flat square-like, rod-like) were synthesized. The XRD patterns showed that phosphors with all morphologies are pure hexagonal phase of Gd2O2S. The atomic resolution structural analysis by transmission electron microscopy revealed the crystal growth model of the phosphors with different morphology. With the morphological change, the band gap energy of Gd2O2S:Tb3+ crystal changed from 3.76 eV to 4.28 eV, followed by different luminescence performance. The samples with sphere-like and cuboid-like microstructures exhibit stronger cathodoluminescence intensity than commercial product by comparison. Moreover, luminescence of Gd2O2S:Tb3+ phosphors have different emission performance excited by UV light radiation and an electron beam, which when excited by UV light is biased towards yellow, and while excited by an electron beam is biased towards cyan. This finding provides a simple but effective method to achieve rare-earth doped oxysulfide phosphors with diversified and tunable luminescence properties through morphology control.
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Affiliation(s)
| | - Zhipeng Li
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.J.); (W.L.); (Y.M.); (W.T.)
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Zheng B, Fan J, Chen B, Qin X, Wang J, Wang F, Deng R, Liu X. Rare-Earth Doping in Nanostructured Inorganic Materials. Chem Rev 2022; 122:5519-5603. [PMID: 34989556 DOI: 10.1021/acs.chemrev.1c00644] [Citation(s) in RCA: 153] [Impact Index Per Article: 76.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Impurity doping is a promising method to impart new properties to various materials. Due to their unique optical, magnetic, and electrical properties, rare-earth ions have been extensively explored as active dopants in inorganic crystal lattices since the 18th century. Rare-earth doping can alter the crystallographic phase, morphology, and size, leading to tunable optical responses of doped nanomaterials. Moreover, rare-earth doping can control the ultimate electronic and catalytic performance of doped nanomaterials in a tunable and scalable manner, enabling significant improvements in energy harvesting and conversion. A better understanding of the critical role of rare-earth doping is a prerequisite for the development of an extensive repertoire of functional nanomaterials for practical applications. In this review, we highlight recent advances in rare-earth doping in inorganic nanomaterials and the associated applications in many fields. This review covers the key criteria for rare-earth doping, including basic electronic structures, lattice environments, and doping strategies, as well as fundamental design principles that enhance the electrical, optical, catalytic, and magnetic properties of the material. We also discuss future research directions and challenges in controlling rare-earth doping for new applications.
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Affiliation(s)
- Bingzhu Zheng
- State Key Laboratory of Silicon Materials, Institute for Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jingyue Fan
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Bing Chen
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, China
| | - Xian Qin
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
| | - Juan Wang
- Institute of Environmental Health, MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Feng Wang
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, China
| | - Renren Deng
- State Key Laboratory of Silicon Materials, Institute for Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xiaogang Liu
- Department of Chemistry, National University of Singapore, Singapore 117543, Singapore
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Controlled synthesis and photoluminescence behaviors of Lu2O2SO4:Eu3+ and Lu2O2S:Eu3+ phosphors. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115527] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Pathak N, Chundawat B, Das P, Modak P, Modak B. Unraveling the site-specific energy transfer driven tunable emission characteristics of Eu 3+ & Tb 3+ co-doped Ca 10(PO 4) 6F 2 phosphors. RSC Adv 2021; 11:31421-31432. [PMID: 35496828 PMCID: PMC9041490 DOI: 10.1039/d1ra04941k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 09/13/2021] [Indexed: 11/21/2022] Open
Abstract
In this study we have explored Ca10(PO4)6F2 as host to develop a variety of phosphor materials with tunable emission and lifetime characteristics based on Eu3+ and Tb3+ as co-dopant ions and the energy transfer process involved with them. The energy transfer from the excited state of Tb3+ ion to the 5D0 state of Eu3+ makes it possible to tune the colour characteristics from yellow to orange to red. Further, such energy transfer process is highly dependent on the concentration of Eu3+ and Tb3+ ions and their site-selective distribution among the two different Ca-sites (CaO9 and CaO6F) available. We have carried out DFT based theoretical calculation for both Eu3+ and Tb3+ ions in order to understand their distribution. It was observed that in cases of co-doped sample, Tb3+ ions prefer to occupy the Ca2 site in the CaO6F network while Eu3+ ions prefer Ca1 site in the CaO9 network. This distribution has significant impact on the lifetime values and the energy transfer process as observed in the experimental photoluminescence lifetime values. We have observed that for the 1st series of compounds, wherein the concentration Tb3+ ions are fixed, the energy transfer from Tb3+ ion at Ca2 site to Eu3+ ion at Ca1 site is dominating (Tb3+@Ca2 → Eu3+@Ca1). However, for the 2nd series of compounds, wherein the concentration Eu3+ ions are fixed, the energy transfer process was found to occur from the excited Tb3+ ion at Ca1 site to Eu3+ ions at both Ca1 and Ca2 (Tb3+@Ca1 → Eu3+@Ca1 and Tb3+@Ca1 → Eu3+@Ca2). This is the first reports of its kind on site-specific energy transfer driven colour tunable emission characteristics in Eu3+ and Tb3+ co-doped Ca10(PO4)6F2 phosphor and it will pave the way for the future development of effective colour tunable phosphor materials based on a single host and same co-dopant ions. Various site specific energy transfer (ET) process such as Tb3+@Ca2 → Eu3+@Ca1, Tb3+@Ca1 → Eu3+@Ca2 and Tb3+@Ca1 → Eu3+@Ca1 were explored in Eu3+ and Tb3+ co-doped Ca10(PO4)6F2 phosphor, which are responsible for tunable colour characteristics.![]()
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Affiliation(s)
- Nimai Pathak
- Radiochemistry Division, Bhabha Atomic Research Centre Mumbai 400085 India +91-22-25405151 +91-22-25590715
| | - Bhagyalaxmi Chundawat
- Ex MSc Student from KJ Somaiya College of Science & Commerce Vidyavihar Mumbai India
| | - Pratik Das
- Fuel Chemistry Division, Bhabha Atomic Research Centre Mumbai 400085 India
| | - Pampa Modak
- Radiological Safety Division, Atomic Energy Regulatory Board Anushaktinagar Mumbai 400094 India
| | - Brindaban Modak
- Theoretical Chemistry Section, Bhabha Atomic Research Centre Mumbai-400 085 India.,Homi Bhabha National Institute (HBNI) Mumbai India
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Venkatesh Bharathi N, Jeyakumaran T, Ramaswamy S, Jayabalakrishnan SS. Synthesis and characterization of a Eu 3+ -activated Ba 2-x V 2 O 7 :xEu 3+ phosphor using a hydrothermal method: a potential material for near-UV-WLED applications. LUMINESCENCE 2021; 36:849-859. [PMID: 33569861 DOI: 10.1002/bio.4031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 01/19/2021] [Accepted: 02/08/2021] [Indexed: 12/17/2022]
Abstract
Eu3+ -activated Ba2 V2 O7 (Ba2-x V2 O7 :xEu3+ ) phosphor materials were synthesized using a hydrothermal method and different concentrations of europium (x = 0.01, 0.02, 0.03, 0.04, and 0.05%). Phase purity, structural, morphological, optical, and luminescence characteristics of the as-synthesized phosphors were studied using powder X-ray diffraction (XRD), high resolution scanning electron microscopy, UV-visible spectroscopy, and fluorescence spectrometry. The recorded XRD patterns of the as-synthesized phosphors were indexed and predicted to be a triclinic structure. A cube-like morphology was obtained for the as-prepared samples. Broad absorption in the UV region from 200 nm to 380 nm was observed and the good transparency in the visible region at 400-800 nm originated from the [VO4 ]3- group charge transfer (CT) transition. The broad emission peak centred at 499 nm was due to the CT band of the [VO4 ]3- group. Also, a sharp peak observed at 613 nm was due to the electric dipole transition of 5 D0 →7 F2 of Eu3+ ions that occupied the lattice sites without inversion symmetry for all concentrations. The colour qualities of the as-prepared samples were calculated using Commission International de l'Eclairage coordinates. The colour-rending index (CRI) value was 86 for the Ba1.97 V2 O7 :0.03Eu3+ phosphor. Furthermore, a WLED with a high CRI value of 95 was achieved by coupling the 3 W 356 nm near-UV light-emitting diode (LED) chip with the Ba2-x V2 O7 :xEu3+ phosphor. These results suggested that the as-prepared phosphor materials are potential candidates for fabrication of near-UV chip excited WLEDs.
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Affiliation(s)
- N Venkatesh Bharathi
- PG and Research Department of Physics, NMSSVN College, Madurai, Tamilnadu, India
| | - T Jeyakumaran
- PG and Research Department of Physics, NMSSVN College, Madurai, Tamilnadu, India
| | - S Ramaswamy
- PG and Research Department of Physics, NMSSVN College, Madurai, Tamilnadu, India
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Tiwari A, Dhoble S. Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review. LUMINESCENCE 2019; 35:4-33. [PMID: 31647168 DOI: 10.1002/bio.3712] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Revised: 08/10/2019] [Accepted: 08/28/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Ashish Tiwari
- Department of ChemistryDr. Bhimrao Ambedkar Government College Pamgarh India
| | - S.J. Dhoble
- Department of PhysicsR.T.M. Nagpur University Nagpur India
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Multicolor and Warm White Emissions with a High Color Rendering Index in a Tb 3+/Eu 3+-Codoped Phosphor Ceramic Plate. MATERIALS 2019; 12:ma12142240. [PMID: 31336792 PMCID: PMC6679120 DOI: 10.3390/ma12142240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/09/2019] [Accepted: 05/09/2019] [Indexed: 11/21/2022]
Abstract
A series of Tb3+/Eu3+-codoped phosphor ceramic plates with a high color rendering index (CRI) for a near-ultraviolet light emitting diode (LED) were fabricated. Color emission can be tuned from green to reddish as a function of Eu3+ concentration. By doping only 0.15 mol% of Eu3+ concentration, a comfortable warm white emission is promoted as a result of simultaneous emissions of Tb3+ and Eu3+ ions. A theoretical model is proposed to calculate the contributions of the emitted color of the donor (Tb3+) and acceptor (Eu3+) ions in terms of europium concentration. The energy transfer from Tb3+ to Eu3+ ions is corroborated by the luminescence spectra and decay time of Tb3+, with a maximum energy transfer efficiency of 76% for 28 mol% of Tb3+ and 14 mol% of Eu3+. Warm white LEDs were constructed using a 380 nm UV chip and showed a CRI of 82.5, which was one of highest values reported for Tb3+/Eu3+-codoped samples. Color-correlated temperature (CCT), color coordinate (CC), and luminous efficacy (LE) were utilized to know the potentials as a phosphor converter in solid-state lighting.
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Kunti AK, Patra N, Harris RA, Sharma SK, Bhattacharyya D, Jha SN, Swart HC. Local Structure and Spectroscopic Properties of Eu3+-Doped BaZrO3. Inorg Chem 2019; 58:3073-3089. [DOI: 10.1021/acs.inorgchem.8b03088] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arup K. Kunti
- Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
| | - Nirmalendu Patra
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Richard A. Harris
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
| | - Shailendra K. Sharma
- Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| | - Dibyendu Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Sambhu N. Jha
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Hendrik C. Swart
- Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
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Pasberg N, den Engelsen D, Fern GR, Harris PG, Ireland TG, Silver J. Structure and luminescence analyses of simultaneously synthesised (Lu1−xGdx)2O2S:Tb3+ and (Lu1−xGdx)2O3:Tb3+. Dalton Trans 2017; 46:7693-7707. [DOI: 10.1039/c7dt00862g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoluminescence spectra and simultaneous synthesis of (Lu1−y–xGdx)2O2S:Tby and (Lu1−y–xGdx)2O3:Tby phosphors are reported/discussed along with cathodoluminescence spectra obtained from sub-micron particles.
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Affiliation(s)
- Natalie Pasberg
- Department of Chemical Engineering
- University of Applied Sciences Münster
- D-48565 Steinfurt
- Germany
| | - Daniel den Engelsen
- Centre for Phosphor and Display Materials
- Wolfson Centre for Materials Processing
- Brunel University London
- Uxbridge
- UK
| | - George R. Fern
- Centre for Phosphor and Display Materials
- Wolfson Centre for Materials Processing
- Brunel University London
- Uxbridge
- UK
| | - Paul G. Harris
- Centre for Phosphor and Display Materials
- Wolfson Centre for Materials Processing
- Brunel University London
- Uxbridge
- UK
| | - Terry G. Ireland
- Centre for Phosphor and Display Materials
- Wolfson Centre for Materials Processing
- Brunel University London
- Uxbridge
- UK
| | - Jack Silver
- Centre for Phosphor and Display Materials
- Wolfson Centre for Materials Processing
- Brunel University London
- Uxbridge
- UK
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