Optical absorption and photoluminescence properties of chromium in different host glasses

Lachheb, R.; Herrmann, Andreas; Damak, Kamel; Rüssel, Christian; Elleuch, Riadh

doi:10.1016/j.jlumin.2017.02.030

Cited by 23 publications

(4 citation statements)

References 23 publications

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“…It is worth mentioning in this respect that the presence of MnO 2 and Cr 2 O 3 with potential to produce luminescent species was detectable in the ISG below 0.010 mass% 3 . However, the emission and excitation features observed (Figure 9) along with the luminescence dynamics exhibited (Figure 10) do not match the characteristic from manganese(II) 48,49 and chromium(III) 50,51 in glasses. Next, we consider the possibility of iron species to be at the origin of the PL features given the significant iron detected in the ISG as 0.065–0.068 mass% Fe 2 O 3 , 3 but that became evident as Fe 2+ and Fe 3+ ions (Figure 7).…”

Section: Resultsmentioning

confidence: 91%

Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

2022

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Borosilicate glass has been adopted internationally for the treatment of nuclear waste with the object of long‐term stabilization through vitrification. Aiming to facilitate experimental comparisons across laboratories, the six‐component international simple glass (ISG) was developed as benchmark. The original ISG produced by Mo‐SCI Corporation (Rolla, MO) was distributed and characterized for different physical properties thus serving as reference for further studies. Still, photoluminescence (PL) properties, which may be useful for scrutinizing radiation‐induced damage, have not been reported. Further, the original ISG contained significant iron impurities, which may present interference in various studies (e.g., optical). Consequently, two new ISG analogs lacking iron impurities (labeled ISG‐1 [closest composition to original ISG] and ISG‐2 [some MgO added at expense of CaO]) were synthesized by Corning Inc. (Corning, NY) (also doped with lanthanum for subsequent corrosion tests involving atom probe tomography), which remain to be fully characterized. Accordingly, this work was undertaken to perform a comprehensive study comparing the three ISG specimens. Various characterizations were then performed on the pristine glasses: X‐ray diffraction and vibrational spectroscopy (structural properties); static‐leach product consistency test (PCT, dissolution behavior); dilatometry and calorimetry measurements (thermal properties); and optical absorption with Tauc and Urbach plots analysis, followed by PL spectroscopy with decay kinetics assessment (optical properties). While the general structural features appeared similar among the glasses, the deconvolution of Raman spectra suggested a lower degree of connectivity in the silica network for ISG‐2. In addition, some differences were indicated from the PCT results and thermal properties assessed, which were discussed based on compositional variations. Further on, the optical properties were shown to be the most distinct. The optical absorption of the original ISG was characterized by Fe2+/Fe3+ impurities not detected for ISG‐1 and ISG‐2. The glasses all exhibited two main PL features (∼1.8 and 2.5 eV) with multiexponential decay behavior apparently of intrinsic origin. In addition, ISG‐1 and ISG‐2 showed a third high‐energy (∼3.4 eV) fast‐decaying contribution tentatively credited to tin impurities, which appeared most significantly for ISG‐1. The results are expected to serve as baseline for future studies simulating the effects of radioactive element decay.

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Section: Resultsmentioning

confidence: 91%

Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

2022

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“…Relative low transmittance at the visible band stems from strong 4 A 2 → 4 T 1 ( 4 F)(450 nm) and 4 A 2 → 4 T 2 ( 4 F) (640 nm) absorptions of Cr 3+ , indicating the six‐coordinated octahedron environment of Cr 3+ ions in NSGO glass. [ 34,35 ] Besides, the small absorption band centered at 978 nm of Cr/Yb co‐doped glass is attributed to 2 F 7/2 → 2 F 5/2 transition of Yb 3+ . [ 36 ] DSC characterization is performed on glass powder to gain insight into the crystal growth kinetics (Figure 1b).…”

Section: Resultsmentioning

confidence: 99%

Crystallization of Na₂SrGe₆O₁₄:Cr³⁺,Yb³⁺ Glass Ceramics Enabling a Watt‐Level Output Power NIR‐I/NIR‐II Lighting Source

Wang,

Chen

et al. 2023

Laser & Photonics Reviews

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Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) lighting sources are applied in non‐destructive examination and illumination supplements for night monitoring. As a critical component of NIR pc‐LED, NIR phosphors are required to possess a high external quantum efficiency (EQE), super thermal stability, and broadband emission to meet applications. Here, Na2SrGe6O14:Cr3+ (NSGO:Cr) glass ceramics (GC) bulk via highly crystallization from glass precursor is fabricated and demonstrates an ultrabroad emission band centered at 815 nm with a full width at half‐maximum (FWHM) of 214 nm and a high EQE of 49.2%. Moreover, Yb3+ co‐doping significantly enhances Cr3+ → Yb3+ energy transfer (ET) due to the stronger Yb3+: 2F7/2‐2F5/2 absorption. Benefiting from the ET process, the Cr/Yb co‐doped GC exhibits NIR‐I/II emission with improved thermal stability from 30.1% to 65.0%. Furthermore, an encapsulant‐free NIR GC‐converted LED (GCc‐LED) is prepared and exhibits 52.2 mW NIR output power with a high photoelectric conversion efficiency (PCE) of 19.4%. Under a large current of 600 mA, the NIR device exhibits a watt‐level output power of 922.4 mW with a PCE of 9.1%. Compared to conventional NIR powder phosphors, NSGO:Cr/Yb GC with high performance can open up an avenue for the fabrication of high power NIR lighting sources.

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“…It is almost obvious that introduction of a special dopant into a relatively suitable host could be used for the generation of precise optical and electrical devices. As a dopant, when d outer-shell electrons of transition metals is surrounded by the attraction and repulsion fields, there will be a special ligand field for the dopants which could lead to a special optical or electrical properties in the bulk [11][12][13]. According to the feathers of LAS glasses like high transmissibility, near zero thermal expansion and non-linear optical properties, they are utilized in advanced applications.…”

Section: Introductionmentioning

confidence: 99%

Impact of bridging oxygens formation on optical properties of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 glasses

Faeghinia

2022

Synth. Sinter.

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In this study, the structural chemistry of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 (LAST) glasses has been analyzed utilizing UV-Vis spectroscopy. Optical parameters like absorption and extinction coefficients, indirect and direct optical band gaps, Urbach energy as well as Fermi energy level of samples were estimated via their absorption spectra. Then, it was tried to make a relationship between the variation of mentioned parameters and structural chemistry of different doped samples. Results of the investigation illustrated that even a little change in the microstructure of glassy samples has an effect on optical parameters and accordingly it could be sensible. Furthermore, it was revealed that Fe3+ ions have the role of network forming in the structure of glass by increasing the formation of bridging oxygens (BOs) in the matrix.

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Optical absorption and photoluminescence properties of chromium in different host glasses

Cited by 23 publications

References 23 publications

Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

Crystallization of Na₂SrGe₆O₁₄:Cr³⁺,Yb³⁺ Glass Ceramics Enabling a Watt‐Level Output Power NIR‐I/NIR‐II Lighting Source

Impact of bridging oxygens formation on optical properties of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 glasses

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Optical absorption and photoluminescence properties of chromium in different host glasses

Cited by 23 publications

References 23 publications

Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

Crystallization of Na2SrGe6O14:Cr3+,Yb3+ Glass Ceramics Enabling a Watt‐Level Output Power NIR‐I/NIR‐II Lighting Source

Impact of bridging oxygens formation on optical properties of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 glasses

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Crystallization of Na₂SrGe₆O₁₄:Cr³⁺,Yb³⁺ Glass Ceramics Enabling a Watt‐Level Output Power NIR‐I/NIR‐II Lighting Source