Photoluminescence characteristics of sintered silica glass doped with Cu ions using mesoporous SiO2-PVA nanocomposite

Ikeda, Hiroshi; Murata, Takahiro; Fujino, Shigeru

doi:10.1016/j.matchemphys.2015.06.010

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…It is known that Cu-doped phosphors show luminescence ascribed to Cu clusters as well as Cu + ions. (27,28) Figure 4 shows OSL stimulation and emission spectra of the 0.1% Cu-doped sample. The samples were irradiated with 1000 mGy of X-rays before the measurements.…”

Section: Resultsmentioning

confidence: 99%

TSL and OSL Properties of Cu-doped CaF2 Ceramics Prepared by Spark Plasma Sintering

Kato¹,

Nakauchi²,

Kawaguchi³

et al. 2022

Sensors and Materials

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The thermally and optically stimulated luminescence (TSL and OSL) properties of Cu-doped CaF 2 ceramics synthesized by spark plasma sintering (SPS), as well as their scintillation and photoluminescence (PL) properties, were investigated. The PL and scintillation spectra showed emission peaks at 390 and 490 nm, which were ascribed to Cu + ions and Cu clusters, respectively, judging from the PL decay time constants. After X-ray irradiation, TSL and OSL were observed upon heating at 182 °C and irradiating light of 620 nm, respectively. The dominant luminescence centers in the TSL and OSL processes were considered to be Cu clusters. The 0.1% Cu-doped CaF 2 sample had a linear TSL response in the dose range from 0.01 to 1000 mGy.

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Section: Resultsmentioning

confidence: 99%

TSL and OSL Properties of Cu-doped CaF2 Ceramics Prepared by Spark Plasma Sintering

Kato¹,

Nakauchi²,

Kawaguchi³

et al. 2022

Sensors and Materials

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“…No absorption was detected in the visible region for the spectrum of the undoped silica glass, whereas a few absorption bands attributed to transitions relevant to copper, e.g., at 5.2, 4.2, and 1.6 eV, were observed in the near UV and visible regions for the spectrum of the Cu-doped silica glass before the irradiation. These peaks were attributed to the 3d 10 → 3d 9 4s 1 transition of Cu + [37,45,46], absorption of Cu + and Cu 2+ dimers [45], and d-d transition of Cu 2+ [39,40]. The absorption at energies higher than 5.5 eV may be ascribed to the charge transfer transition of Cu 2+ [39] and the transition to higher levels of Cu + .…”

Section: Spectroscopies Of Undoped and Cu-doped Glasses Before And Af...mentioning

confidence: 92%

Electron and hole capture processes in Cu-doped glass exhibiting radiophotoluminescence

Hashikawa¹,

Takada²,

Nishi³

et al. 2021

J. Phys.: Condens. Matter

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Radiophotoluminescence (RPL) is a radiation effect, and materials exhibiting RPL can be used in dosimeters. In this study, we observed remarkable RPL in Cu-doped aluminoborosilicate and silica glasses upon their exposure to 60Co γ-rays. The RPL intensity increased proportionally with the irradiation dose up to several hundreds of grays and then saturated beyond a certain dose level. An equation was derived theoretically to express the relationship between the RPL intensity and irradiation dose based on the RPL mechanism, in which copper ions, Cu2+ and Cu+, capture electrons and holes, generated by the irradiation, respectively, resulting in a change in the valence. The equation fitted well with the experimental results, providing two parameters for the equation. These parameters are associated with the saturation dose level and sensitivity, which are important for the application of materials to dosimeters. These parameters were discussed based on electron and hole capture processes in the RPL mechanism.

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“…Therefore, we can consider that the wider spectral shape of scintillation could be attributed to the emergence of a new emission peak at 502 nm. As discussed in PL, Cu + is known to show different emission bands depending on the oxygen coordinate environment including the possibility of a Cu + -Cu + dimer, (18) and the marginal emission from Cu + at different environments would be observed in the scintillation spectrum that causes the broad spectral feature.…”

Section: Pl Propertiesmentioning

confidence: 99%

“…From the spectral shapes and decay times, it would be reasonable that the emissions due to Cu + at different oxygen coordinate environments or Cu + -Cu + dimer appeared in scintillation. (18) In order to clarify the origin of the above-mentioned emission, additional verification experiments are required.…”

Section: Scintillation Characterizationsmentioning

confidence: 99%

Dopant Concentration Dependence of Luminescence in Cu-doped Lithium Aluminophosphate Glasses

Shiratori¹,

Isokawa²,

Kawaguchi³

et al. 2019

Sensors and Materials

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We have prepared glasses with the composition of Cu-doped 30Li 3 PO 4-70Al(PO 3) 3 and investigated their luminescence characteristics. The glass samples were synthesized by the melt quenching method, and the Cu concentrations of the prepared samples were 0.1, 0.2, 0.5, and 1.0%. In the absorption spectrum, the absorptions due to Cu + and Cu 2+ around 290 and 850 nm were observed, respectively. The absorption due to Cu 2+ increased in proportion to the amount of Cu. In the photoluminescence (PL) decay curve, the PL decay time was a typical value of the 3d 9 4s 1-3d 10 transition of Cu + (~30 μs). The scintillation spectra showed a broad emission band from 400 to 600 nm, and the emission intensities were proportional to the Cu concentration.

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Photoluminescence characteristics of sintered silica glass doped with Cu ions using mesoporous SiO2-PVA nanocomposite

Cited by 12 publications

References 18 publications

TSL and OSL Properties of Cu-doped CaF2 Ceramics Prepared by Spark Plasma Sintering

TSL and OSL Properties of Cu-doped CaF2 Ceramics Prepared by Spark Plasma Sintering

Electron and hole capture processes in Cu-doped glass exhibiting radiophotoluminescence

Dopant Concentration Dependence of Luminescence in Cu-doped Lithium Aluminophosphate Glasses

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