High-Pressure Effect in Vis–NIR Emission of Sm<sup>3+</sup>-Doped GeO<sub>2</sub>–PbO Glasses

Herrera, A.; Azevedo, G. de M.; Balzaretti, Naira Maria

doi:10.1021/acs.jpcc.7b10295

Cited by 13 publications

(10 citation statements)

References 44 publications

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“…After densification at 7.7 GPa, these bands shifted to lower energies, indicating an irreversible pressure-induced modification in the glass network. This result is consistent with a previous investigation of the effect of densification under high pressure of the same glass host doped with Sm 3+ , based on experimental results obtained from Raman spectroscopy and extended X-ray absorption fine structure techniques . It that case, high pressure induced a decrease in the number of GeO 4 tetrahedral units and an increase in the GeO 6 octahedral units.…”

Section: Resultssupporting

confidence: 93%

“…This result is consistent with a previous investigation of the effect of densification under high pressure of the same glass host doped with Sm 3+ , based on experimental results obtained from Raman spectroscopy and extended X-ray absorption fine structure techniques. 30 It that case, high pressure induced a decrease in the number of GeO 4 tetrahedral units and an increase in the GeO 6 octahedral units. Since the octahedral configuration presents a higher packing density than the tetrahedral configuration, this effect should be expected after densification of the glass host.…”

Section: ■ Results and Discussionmentioning

confidence: 85%

“…The heavy metal GeO 2 –PbO vitreous systems present a large solubility for RE ions, relatively low phonon energy, large optical transparency in the visible and infrared regions, good thermal stability, and high refractive index. − These properties make them relevant glasses with possible applications of optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

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Effect of High Pressure in the Luminescence of Pr³⁺-Doped Ge₂O–PbO Glass Containing Au Nanoparticles

Herrera

Balzaretti

2018

J. Phys. Chem. C

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In this paper, the combined effect of gold nanoparticles and high-pressure densification on the luminescence of Pr3+-doped heavy metal GeO2–PbO photonic glass was investigated. Localized states related to ion-trapped exciton defects, S1 and S2, were observed at 342 and 412 nm before densification. After densification under 7.7 GPa, the structure of the glass host changed irreversibly, as indicated by the infrared spectrum, refractive index, and density measurements. Transmission electron microscopy analyses indicated that the high-pressure densification induced the formation of clusters of gold nanoparticles. The modifications observed in the absorption and luminescence spectra of Pr3+ ions in the VIS–NIR range were associated to the changes in the local field surrounding the Pr3+ ions in the host glass induced by high pressure. For excitation at 445 nm (luminescence from 3P2) and 593 nm (luminescence from 1D2), the combined effect of densification and gold nanoparticles induced an increase in the emission band at 1050 cm–1. For excitation at 488 nm (luminescence from 3P0), the combined effect resulted in a strong decrease in the emission intensities in the VIS, revealing the emergence of nonradiative processes in resonance with 3P0 state. The observed behavior was probably due to energy transfer, ion trapped exciton defects, and cross-relaxation processes among the Pr3+ ions and gold nanoparticles.

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Section: Resultssupporting

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 85%

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Effect of High Pressure in the Luminescence of Pr³⁺-Doped Ge₂O–PbO Glass Containing Au Nanoparticles

Herrera

Balzaretti

2018

J. Phys. Chem. C

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“…The predicted bulk modulus was 40–50 GPa, depending on the final amorphization state. These results agree with experimental parameters calculated from the analysis of extended X-ray absorption fine structure (EXAFS) . In conclusion, MD indicates that the local environment around the Er +3 ion is probably strongly coupled to Ge–O tetrahedral substructures, which have a phonon energy around 792 cm –1 , according to the Raman spectra of the glassy 59GeO 2 -41PbO system …”

Section: Resultssupporting

confidence: 86%

“…The structural properties of GeO 2 –PbO glass have been largely addressed by experimental techniques. − For 59GeO 2 -41PbO glass composition, differential thermal analysis (DTA) and X-ray diffraction (XRD) experimental results indicated that the local arrangement that prevails is PbGeO 3 …”

Section: Computational Simulationmentioning

confidence: 99%

Formation of Au@Ag Bimetallic Nanoparticles via Ion Implantation and Its Effects on Boosting the Near-Infrared Emission of Er³⁺ Ions in Germanate Glass for Applications in Optical Amplifiers

2022

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In this work, germanate glasses of composition 59GeO2-41PbO in mol% doped with Er3+ ions were synthesized using the melt-quenching route. Au and Ag nanoparticles and Au@Ag bimetallic nanoparticles were formed on the surface of the germanate glasses by ion implantation followed by thermal treatments. X-ray diffraction patterns confirmed the amorphous structure of the implanted glasses. Molecular dynamics was used to simulate the GeO2–PbO glass structure. Surface plasmon resonance bands centered at 486, 537, and 574 nm, obtained through ultraviolet–visible absorption spectra, supported the formation of Ag, Au, and Au@Ag nanoparticles, respectively. Transmission electron microscopy (TEM) revealed the presence of spherical Au and Ag nanoparticles as well as the presence of nonspherical Au@Ag bimetallic nanoalloys. Refractive index n and extinction coefficient k were measured by ellipsometry. Judd–Ofelt theory was applied to evaluate the phenomenological intensity parameters Ωλ (λ = 2,4,6) , radiative parameters, and stimulated emission cross-sections for glasses doped with Er3+ and implanted with Au @Ag bimetallic nanoalloys. Efficient boosting of the near-infrared emission for the 4I13/2 → 4I15/2 transition was observed in the glass doped with Er3+ ions due to the presence of Au@Ag bimetallic nanoalloys. The possible cause of this improvement in luminescent intensity was attributed to the strong local field effect due to the efficient synergy between Au@Ag bimetallic nanoalloys and the Er3+ ions. The results obtained in this work indicate that the vitreous system GeO2–PbO glass doped with Er3+ ions and with the incorporation of Au@Ag bimetallic nanoalloys via ionic implantation exhibit excellent spectroscopic properties compared to other vitreous host glasses doped with the Er3+, indicating its potential applications in optical amplifiers.

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Tailored NIR‐II Lanthanide Luminescent Nanocrystals for Improved Biomedical Application

Zhao

SIK

Zhang

et al. 2022

Advanced Optical Materials

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Recently, in vivo optical imaging in the second-near-infrared window (NIR-II, 1000-1700 nm) that allows high spatiotemporal resolution and imaging depth due to reduced photon scattering and weak auto-fluorescence has drawn more and more attention. Among various NIR-II optical probes, lanthanide-doped nanoparticles show several great advantages including abundant energy levels transitions for multi-emissions, ultra-stable emissions for long-term detection, and long luminescence lifetime for background-free imaging. These merits have inspired researchers to make great efforts to develop superior lanthanide-doped nanoparticles for in vivo bio-imaging and bio-sensing. In this review, NIR-II luminescent emissions and absorption spectra of several lanthanide ions are outlined, and the recent advances in designing NIR-II lanthanide-doped nanocrystals with optimized quantum yields are summarized. Then their significant concerns for in vivo imaging and sensing including assembly and disassembly, clearance, and responsiveness of lanthanide-based nanoparticles are discussed. Major challenges and future opportunities in the NIR-II bio-imaging using lanthanide nanocrystals are finally proposed to direct new solutions and interdisciplinary research.

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High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

Cited by 13 publications

References 44 publications

Effect of High Pressure in the Luminescence of Pr³⁺-Doped Ge₂O–PbO Glass Containing Au Nanoparticles

Effect of High Pressure in the Luminescence of Pr³⁺-Doped Ge₂O–PbO Glass Containing Au Nanoparticles

Formation of Au@Ag Bimetallic Nanoparticles via Ion Implantation and Its Effects on Boosting the Near-Infrared Emission of Er³⁺ Ions in Germanate Glass for Applications in Optical Amplifiers

Tailored NIR‐II Lanthanide Luminescent Nanocrystals for Improved Biomedical Application

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High-Pressure Effect in Vis–NIR Emission of Sm3+-Doped GeO2–PbO Glasses

Cited by 13 publications

References 44 publications

Effect of High Pressure in the Luminescence of Pr3+-Doped Ge2O–PbO Glass Containing Au Nanoparticles

Effect of High Pressure in the Luminescence of Pr3+-Doped Ge2O–PbO Glass Containing Au Nanoparticles

Formation of Au@Ag Bimetallic Nanoparticles via Ion Implantation and Its Effects on Boosting the Near-Infrared Emission of Er3+ Ions in Germanate Glass for Applications in Optical Amplifiers

Tailored NIR‐II Lanthanide Luminescent Nanocrystals for Improved Biomedical Application

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Product

Resources

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High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

Effect of High Pressure in the Luminescence of Pr³⁺-Doped Ge₂O–PbO Glass Containing Au Nanoparticles

Effect of High Pressure in the Luminescence of Pr³⁺-Doped Ge₂O–PbO Glass Containing Au Nanoparticles

Formation of Au@Ag Bimetallic Nanoparticles via Ion Implantation and Its Effects on Boosting the Near-Infrared Emission of Er³⁺ Ions in Germanate Glass for Applications in Optical Amplifiers