Direct Imaging of the Distribution of Nd<sup>3+</sup> Ions in Glasses Containing PbS Quantum Dots

Park, Won Ji; Liu, Chao; Heo, Jong

doi:10.1111/jace.13582

Cited by 18 publications

(8 citation statements)

References 19 publications

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“…5d) and it is consistent with the results of electron energy loss spectroscopy (EELS) (Fig. S1) 28 . The elemental concentration profile along one QD showed that [Pb] increased to ~10 at.%, and [Nd] increased to 12 at.% (Fig.…”

Section: Resultssupporting

confidence: 89%

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses

Park

Kim

Lee

et al. 2019

Sci Rep

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The first 3-D direct observation of clusters of Nd oxide inside silicate glasses was achieved using atom probe tomography. Three-dimensional elemental maps of major chemical elements in glasses such as Si, Al, Zn and O showed no evidence of regions that had concentrations higher than the average values, whereas the Nd aggregated into regions of high concentration. Elemental maps of Nd and Pb recorded from the glasses containing PbS QDs showed highly-concentrated areas of both elements at the same locations; this result indicates that PbS QDs formation started in association with the Nd clusters.

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Section: Resultssupporting

confidence: 89%

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses

Park

Kim

Lee

et al. 2019

Sci Rep

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“…Shim and co‐authors also found that the lifetime of Er 3+ : 4 I 13/2 energy level does not change with the heat‐treated process . In the Nd 3+ ‐doped QDs glass, the lifetime of the Nd 3+ : 4 F 3/2 energy level hardly changed with the generation of QDs . The Nd 3+ ions are bonded with the oxygen atoms and their local environments are unaffected by heat treatment.…”

Section: Resultsmentioning

confidence: 97%

Quantum‐dots‐precipitated rare‐earth‐doped glass for ultra‐broadband mid‐infrared emissions

et al. 2018

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Mid‐infrared (MIR) fiber lasers have wide application prospects and great commercial value in the fields of medical operation, remote sensing and military weapon, etc. At present, Tm3+‐doped glass can obtain broadband luminescence at 2 μm, the introduction of Ho3+ or Er3+ ions also shows a tunable MIR emission but with limited success. Herein, the rare‐earth (RE) doped glass with quantum dots (QDs) precipitation is proposed for achieving ultra‐broadband MIR emissions. The types and sizes of QDs are determined by the XRD and TEM, and their optical properties are further characterized by the absorption and emission spectra as well as the lifetime decay curves. It is found that the diameter of the QDs is gradually increased from 1.7 to 5.1 nm by increasing the heat‐treated temperature from 490°C to 530°C, respectively. Interestingly, an ultra‐broadband emission covering 1400‐2600 nm is achieved from the heat‐treated glass upon the excitation of 808 nm laser diode as a result of an overlapped emission from Tm3+ and PbS. All results suggest that these QDs‐precipitated RE‐doped glasses have important application prospects in ultra‐broadband MIR laser glass, glass fiber, and fiber lasers.

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“…doped Tm 2 O 3 , La 2 O 3 , and Ho 2 O 3 to control the precipitation of PbS QDs in glasses, and observed a similar blue shift in the peak wavelengths of the absorption and PL bands with increasing RE concentration . Recently, electron energy loss spectroscopy (EELS) analysis has revealed that the concentration of RE ions, such as Nd 3+ , is considerably higher inside the PbS nanocrystals than in the glass matrix . However, the role of RE ions in the precipitation of QDs is not yet clearly understood.…”

Section: Introductionmentioning

confidence: 87%

Role of Nd³⁺ ions on the nucleation and growth of PbS quantum dots (QDs) in silicate glasses

Park

Kim

et al. 2017

J Am Ceram Soc

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The influence of Nd 2 O 3 addition on the precipitation kinetics of lead chalcogenide (PbS) quantum dots (QDs) in silicate glasses was investigated. Energy dispersive X-ray spectroscopy (EDS) indicated that the Nd 3+ ions are preferentially located inside the PbS QDs rather than in the glass matrix. Changes in diameter (D) of PbS QDs exhibited smaller time dependencies (i.e., D%t 0.270-0.286 ) than that predicted by the classical Lifshitz-Slyozov-Wagner (LSW) theory. This is due to the limited concentrations of Pb 2+ and S 2À ions and the large diffusion distance inside the glass matrix. In addition, extended X-ray absorption fine structure (EXAFS) results indicated that the formation of PbS QDs was retarded due to the presence of Nd 2 O 3 in the glasses, as the large NdO x polyhedra interrupt the diffusion of Pb 2+ and S 2À ions. We believe that these Nd 3+ ions are primarily located in PbS QDs in the form of Nd-O clusters, and that the PbS QDs are built on top of these clusters. K E Y W O R D Sglass, optical materials/properties, rare earths

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Direct Imaging of the Distribution of Nd³⁺ Ions in Glasses Containing PbS Quantum Dots

Cited by 18 publications

References 19 publications

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses

Quantum‐dots‐precipitated rare‐earth‐doped glass for ultra‐broadband mid‐infrared emissions

Role of Nd³⁺ ions on the nucleation and growth of PbS quantum dots (QDs) in silicate glasses

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Direct Imaging of the Distribution of Nd3+ Ions in Glasses Containing PbS Quantum Dots

Cited by 18 publications

References 19 publications

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses

Atom Probe Tomographic Imaging of PbS Quantum Dot Formation on Neodymium Clusters in Silicate Glasses

Quantum‐dots‐precipitated rare‐earth‐doped glass for ultra‐broadband mid‐infrared emissions

Role of Nd3+ ions on the nucleation and growth of PbS quantum dots (QDs) in silicate glasses

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Direct Imaging of the Distribution of Nd³⁺ Ions in Glasses Containing PbS Quantum Dots

Role of Nd³⁺ ions on the nucleation and growth of PbS quantum dots (QDs) in silicate glasses