Two types of oxygen-deficient centers in synthetic silica glass

Imai, Hiroaki; Arai, Kazuo; Imagawa, Hiroshi; Hosono, Hideo; Abe, Yoshihiro

doi:10.1103/physrevb.38.12772

Cited by 272 publications

(110 citation statements)

References 8 publications

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“…For the structural model of ODC (II), 2-fold coordinated Si (Si 0 2 ) and non-relaxed oxygen vacancy have been proposed before. [23][24][25][26][27][28][29] In particular, the calculated properties of 2-fold coordinated Si (Si 0 2 ) were in a good agreement with the experimental PL data. 23 Substantial excitation energy, emission energy and a life time of ODC (II) were reported to be 5.0 eV (250 nm), 4.4 eV (280 nm) and 4.2 ns, respectively.…”

Section: Author(s) All Article Content Except Where Otherwise Notedsupporting

confidence: 71%

Investigation of photoluminescence of Si−O−C(−H) ceramics at an early stage of decarbonization by using high energy excitation

et al. 2014

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Si−O−C(−H) ceramics with reduced carbon contents were prepared by pyrolyzing polysiloxane particles in hydrogen at temperatures of 750, 800 and 850 °C. Under HeCd laser irradiation (325 nm), the obtained ceramics show broad spectra peaking at 400–415 nm. On the other hand, the excitation on the higher energy region by an ArF excimer laser (193 nm) induces new PL bands located at short wavelength region of 300 and 355 nm. Such high energy PL bands appear prominently in the ceramics synthesized at 750 °C, and are minor in ceramics synthesized at 800 and 850 °C.

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Section: Author(s) All Article Content Except Where Otherwise Notedsupporting

confidence: 71%

Investigation of photoluminescence of Si−O−C(−H) ceramics at an early stage of decarbonization by using high energy excitation

et al. 2014

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“…The weaker output at short wavelengths in Fig. 2(a) was mostly attributed to the absorption associated with defects 22 and the bandgap of phosphosilicate glass 23 which can be further optimized. The broad absorption peak centered at λ ∼ 250 nm has been attributed to oxygen deficient centers (ODCs) and impeded the loss characterization of the Gd 3+ transitions from the ground levels to the 6 D J and 6 I J via cut back method.…”

confidence: 99%

Ultraviolet photoluminescence in Gd-doped silica and phosphosilicate fibers

Wang

Barua

et al. 2017

APL Photonics

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“…This band has been extensively investigated and is usually attributed in amorphous SiO 2 to oxygen deficient centers, in particular to two-fold coordinated Si defects or to asymmetrically relaxed or unrelaxed neutral oxygen vacancies. 24,25 The two-fold coordinated Si defect is more disordered than the oxygen vacancy defect. 26 Due to the porous, disordered nature of the silica forming the opal spheres ͑as visualized in TEM images͒ and the structural disorder caused by irradiation, this defect seems in our case to occur with a higher probability than the oxygen vacancies.…”

Section: B 27 Ev Bandmentioning

confidence: 99%

Defect and nanocrystal cathodoluminescence of synthetic opals infilled with Si and Pt

Dı́az-Guerra

Kurdyukov

Piqueras

et al. 2001

Journal of Applied Physics

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Synthetic opals-composed of 250 nm amorphous silica spheres closed packed in a face centered cubic structure-have been infilled with silicon, platinum, and with Si and different Pt contents. The luminescent properties of these composites have been investigated by cathodoluminescence ͑CL͒ microscopy and spectroscopy. CL emission is influenced by the material used to infill the pores of the opal matrix. CL spectra of all the samples investigated show two well-known bands, associated with the defect structure of the silica spheres, centered at about 1.9 and 2.7 eV, respectively. Emission in the 2.15-2.45 eV range, particularly intense in opal-based composites with a high Pt content, is tentatively associated with SiO 2 defects involving silicon clusters. A CL band peaked at about 3.4 eV as well as a band in the 1.50-1.75 eV range, whose peak position seems to be affected by the Pt content of the samples, are associated with the presence of Si nanocrystals. The behavior of these emissions suggests that both are related to defect states at the interface between Si nanocrystals and SiO 2 forming the opal spheres.

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Two types of oxygen-deficient centers in synthetic silica glass

Cited by 272 publications

References 8 publications

Investigation of photoluminescence of Si−O−C(−H) ceramics at an early stage of decarbonization by using high energy excitation

Investigation of photoluminescence of Si−O−C(−H) ceramics at an early stage of decarbonization by using high energy excitation

Ultraviolet photoluminescence in Gd-doped silica and phosphosilicate fibers

Defect and nanocrystal cathodoluminescence of synthetic opals infilled with Si and Pt

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