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Manju, Rajput P, Vij A, Thakur A. Dysprosium site occupancy in SrZnO 2 nanophosphors probed through XANES. Phys Chem Chem Phys 2023; 25:28473-28478. [PMID: 37846758 DOI: 10.1039/d3cp03041e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Doping-assisted lattice site engineering is widely practiced to obtain a tailor made response, which subsequently poses a need for an efficient probe of the local electronic structure of the system. This study presents a detailed analysis of the local electronic structure around the host cations (Zn2+ and Sr2+) and dopant (Dy3+) through combined experimental and simulated X-ray absorption near edge structure. The real space full multiple scattering-based simulations of the Zn K-edge are done by substituting Dy at cationic sites in the second coordination shell around Zn, in various combinations along with and/or without oxygen vacancies in the system. The results revealed that Dy tends to substitute the less symmetric Sr2+ site at low doping concentration, whereas it starts substituting the relatively more symmetric Zn2+ lattice site with an increase in doping concentration, consequently affirming the origin of cold white emission upon charge transfer in the system (Manju, M. Jain, P. Vashishtha, G. Gupta, A. Sharma, S. O. Won, A. Vij and A. Thakur, J. Phys.: Condens. Matter, 2020, 33, 035703). The effect of Zn site occupancy is seen as bifurcation of the single peaked Dy L3 absorption edge, which is usually reported as the sole indication of the existence of a mixed valence state. Thus, the combined analyses decipher the effect of lattice site occupancy on the local electronic structure of host as well as dopant atoms.
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Affiliation(s)
- Manju
- Advanced Materials Research Lab, Department of Physics, Punjabi University Patiala-147 002, Punjab, India.
- Department of Physics, Chandigarh University, Mohali-140 413, Punjab, India
| | - Parasmani Rajput
- Beamline Development and Application Section, Bhabha Atomic Research Center, Trombay, Mumbai-400 085, Maharashtra, India.
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai-400094, India
| | - Ankush Vij
- Department of Physics and Astrophysics, Central University of Haryana, Mahendragarh-123 031, Haryana, India.
| | - Anup Thakur
- Advanced Materials Research Lab, Department of Physics, Punjabi University Patiala-147 002, Punjab, India.
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Wang T, Xu L, Wu Z, Li Y, Yin Z, Han J, Yang Z, Qiu J, Song Z. Self-doping induced oxygen vacancies and lattice strains for synergetic enhanced upconversion luminescence of Er 3+ ions in 2D BiOCl nanosheets. NANOSCALE 2022; 14:12909-12917. [PMID: 36043419 DOI: 10.1039/d2nr02624d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Rare earth (RE) ions combined with two-dimensional (2D) semiconductors can exhibit unexpected optical properties. However, fluorescence quenching has always been inevitable due to defects associated with the synthesis and doping of 2D materials. In this work, we reported an efficient upconversion (UC) enhancement of Er3+ doped BiOCl nanosheets, utilizing a defect engineering strategy conversely rather than eliminating defects. Experiments and theoretical calculations provide evidence that oxygen vacancies (OVs) and lattice strain are simultaneously formed in the BiOCl:Er3+ nanosheets through self-doping of Cl- ions. Under 980 nm excitation, samples doped with 300 mol% Cl- ions exhibit the best luminescent emission, and the green and red UC emissions are enhanced 3.5 and 15 times, respectively. We showed that the OVs in the 2D semiconductor can act as energy bridges to transfer charges to the Er3+ energy level, enriching the electron population at the excited levels; while, the lattice strain enhances the energy transfer and charge accumulation, which synergistically enhance the UC luminescence. This research provides a new insight into the development of defect engineering for UC PL in 2D nanomaterials.
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Affiliation(s)
- Tianhui Wang
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Liang Xu
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Zhijie Wu
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Yongjin Li
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Zhaoyi Yin
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Jin Han
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Zhengwen Yang
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Jianbei Qiu
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Zhiguo Song
- School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
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Gupta M, Nagarajan R, Ramamurthy C, Vivekanandan P, Prakash GV. KLa (0.95-x)Gd xF 4:Eu 3+ hexagonal phase nanoparticles as luminescent probes for in vitro Huh-7 cancer cell imaging. Dalton Trans 2021; 50:5197-5207. [PMID: 33881075 DOI: 10.1039/d1dt00539a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A facile chemical route is reported for synthesizing red-emitting photoluminescent/MRI multi-functional KLa(0.95-x)GdxF4:Eu3+ (x = 0 to 0.4) bio-compatible nanomaterials for targeted in vitro tumor imaging. Hexagonal phase pure nanoparticles show a significant and systematic change in morphology with enhanced photoluminescence due to the substitution of La3+ with Gd3+ ions. Single phase β-KLa(0.95-x)GdxF4:Eu3+ exhibits multifunctional properties, both intense red emission and strong paramagnetism for high-contrast bioimaging applications. These silica capped magnetic/luminescent nanoparticles show long-term colloidal stability, optical transparency in water, strong red emission, and low cytotoxicity. The cellular uptake of coated nanoparticles was investigated in liver cancer cell line Huh-7. Our findings suggest that these nanoparticles can serve as highly luminescent imaging probes for in vitro applications with potential for in vivo and live cell imaging applications.
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Affiliation(s)
- Mohini Gupta
- Nanophotonics Lab, Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016 India. and Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India.
| | - Rajamani Nagarajan
- Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India.
| | - Chitteti Ramamurthy
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi, 110016, India.
| | - Perumal Vivekanandan
- Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi, 110016, India.
| | - G Vijaya Prakash
- Nanophotonics Lab, Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016 India.
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Liu W, Zhang W, Liu R, Li G. Up-conversion of lanthanide ions and down-conversion defect luminescence in BaGdF 5:Yb,Er/Tm for application in anti-counterfeiting. NEW J CHEM 2021. [DOI: 10.1039/d1nj03262c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BaGdF5:Yb,Er/Tm was prepared using a one-pot hydrothermal method, and the anti-counterfeiting patterns obtained by screen printing have dual-mode luminescence.
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Affiliation(s)
- Wenjing Liu
- School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Wenjun Zhang
- School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Ruxin Liu
- School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Guojing Li
- School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China
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Nagarajan R, Ahmad S, Kumar M, Gupta M, Vijaya Prakash G. Energy Upconversion in Rare‐Earth‐Doped Tin‐Based Double Halo Perovskites, A
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SnCl
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(A = K, Rb, and Cs). Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000748] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Rajamani Nagarajan
- Materials Chemistry Group Department of Chemistry University of Delhi 110007 Delhi India
| | - Shahzad Ahmad
- Department of Chemistry Zakir Husain Delhi College University of Delhi 110002 Delhi India
| | - Manish Kumar
- Materials Chemistry Group Department of Chemistry University of Delhi 110007 Delhi India
| | - Mohini Gupta
- Materials Chemistry Group Department of Chemistry University of Delhi 110007 Delhi India
- Nanophotonics Lab Department of Physics Indian Institute of Technology Delhi 110016 New Delhi India
| | - G. Vijaya Prakash
- Nanophotonics Lab Department of Physics Indian Institute of Technology Delhi 110016 New Delhi India
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