The correlation of the 7.6 eV optical absorption band in pure fused silicon dioxide with twofold-coordinated silicon

Trukhin, A.N.; Skuja, Linards; Boganov, A.G.; Rudenko, V. S.

doi:10.1016/0022-3093(92)90057-q

Cited by 54 publications

(68 citation statements)

References 7 publications

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“…As previously stated [1,[3][4][5]7], we connect the luminescence of a single crystal of stishovite with similar luminescence (also two bands, blue and UV) in as-received oxygen deficient silica glass [13][14][15][16][17] and an analogous luminescence center in α-quartz crystal induced [9][10][11][12] with damaging radiation (γ, neutron and dense electron beam). That means similar defects are observed in these materials.…”

Section: Discussionmentioning

confidence: 81%

“…ODC luminescence of silica glasses, with which we compare the luminescence of stishovite, is well studied for dry silica (see for example [13][14][15][16]), therefore a one-to-one correspondence is not possible because of the OH group's influence on the crystal. On the other hand, there is a 2 N.A.…”

Section: Discussionmentioning

confidence: 99%

“…The second band decays with τ = 4 5 ns and corresponds to singlet-singlet transitions in ODCs [13]. Beside the ODC(II) or twofold coordinated silicon, a wide spectrum of modified ODC is observed due to nearest defects, or in other words, ODCs forming a complex with nearest defects [14][15][16][17]. The parameters of such ODC luminescence are different from those of the lone twofold coordinated silicon center [13], however, PL spectra are similar to ODC(II).…”

Section: Introductionmentioning

confidence: 99%

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Luminescence of silicon Dioxide — silica glass, α-quartz and stishovite

Trukhin¹,

Šmits

Chikvaidze

et al. 2011

Open Physics

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Abstract:This paper compares the luminescence of different modifications of silicon dioxide -silica glass, α-quartz crystal and dense octahedron structured stishovite crystal. Under x-ray irradiation of pure silica glass and pure α-quartz crystal, only the luminescence of self-trapped exciton (STE) is detected, excitable only in the range of intrinsic absorption. No STE luminescence was detected in stishovite since, even though its luminescence is excitable below the optical gap, it could not be ascribed to a self-trapped exciton. Under ArF laser excitation of pure α-quartz crystal, luminescence of a self-trapped exciton was detected under two-photon excitation. In silica glass and stishovite mono crystal, we spectrally detected mutually similar luminescences under single-photon excitation of ArF laser. In silica glass, the luminescence of an oxygen deficient center is presented by the so-called twofold coordinated silicon center (L.N. Skuja et al., Solid State Commun. 50, 1069(1984). This center is modified with an unknown surrounding or localized states of silica glass (A.N. Trukhin et al., J. Non-Cryst. Solids 248, 40 (1999)). In stishovite, that same luminescence was ascribed to some defect existing after crystal growth. For α-quartz crystal, similar to silica and stishovite, luminescence could be obtained only by irradiation with a lattice damaging source such as a dense electron beam at a temperature below 80 K, as well as by neutron or γ-irradiation at 290 K. In spite of a similarity in the luminescence of these three materials (silica glass, stishovite mono crystal and irradiated α-quartz crystal), there are differences that can be explained by the specific characteristics of these materials. In particular, the nature of luminescence excited in the transparency range of stishovite is ascribed to a defect existing in the crystal after-growth. A similarity between stishovite luminescence and that of oxygen-deficient silica glass and radiation induced luminescence of α-quartz crystal presumes a similar nature of the centers in those materials.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Luminescence of silicon Dioxide — silica glass, α-quartz and stishovite

Trukhin¹,

Šmits

Chikvaidze

et al. 2011

Open Physics

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“…The SiO x nanowires photoluminescence has been widely reported [22][23][24][25][26][27][28][29]. Nishikawa et al [26] observed several bands in various types of high purity silica glass, with different peak energies ranging from 1.9 to 4.3 eV under 7.9 eV excitation.…”

Section: Introductionmentioning

confidence: 98%

Direct Growth and Photoluminescence of SiOx Nanowires and Aligned Nanocakes by Simple Carbothermal Evaporation

Al-Ruqeishi

Nor

Amin

et al. 2011

Silicon

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The growth of SiO x nanowires and nanocakes on an Au-coated n-type-Silicon (100) substrate was achieved via carbothermal evaporation. The effects of the Au layer thickness and the rapid heating rate on the morphology of obtained SiO x nanowires were investigated. A broad emission band from 290 to 600 nm was observed in the photoluminescence (PL) spectrum of these nanowires. There are four PL peaks: one blue emission peak 485 nm (2.56 eV) two green bands centered at 502 nm (2.47 eV) and 524 nm (2.37 eV) for nanocakes and one ultraviolet emission peak at 350 nm (3.54 eV) and a hemisphere curve over the bluish green area taken for SiO x nanowires. These emissions may be related to the various oxygen defects and twofold coordinated silicon lone pair centers.

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“…The literature presents mainly two different explanations for the origin of this blue-green emission. One proposition categorizes this emission as photoelectric response as well as inner center and recombination type of luminescence [52], attributing the blue emission to triplet-singlet transition in twofold coordinated Si centers [53], due to oxygen deficit and irradiation effects [50]. The second proposition associates the emission with luminescent centers containing trivalent titanium paired with an oxide vacancy, which may exist either as matrix element or as an impurity [23,24,[46][47][48][49].…”

Section: Appl Sci 2017 7 1243mentioning

confidence: 99%

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

et al. 2017

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Abstract:The smectites represent a versatile class of clay minerals with broad usage in industrial applications, e.g., cosmetics, drug delivery, bioimaging, etc. Synthetic hectorite Na 0.7 (Mg 5.5 Li 0.3 ) [Si 8 O 20 ](OH) 4 is a distinct material from this class due to its low-cost production method that allows to design its structure to match better the applications. In the current work, we have synthesized for the first time ever nanoclay materials based on the hectorite structure but with the hydroxyl groups (OH − ) replaced by Br − or I − , yielding bromohectorite (Br-Hec) and iodohectorite (I-Hec). It was aimed that these materials would be used as phosphors. Thus, OH − replacement was done to avoid luminescence quenching by multiphonon de-excitation. The crystal structure is similar to nanocrystalline fluorohectorite, having the d 001 spacing of 14.30 Å and 3 nm crystallite size along the 00l direction. The synthetic materials studied here show strong potential to act as host lattices for optically active species, possessing mesoporous structure with high specific surface area (385 and 363 m 2 g −1 for Br-Hec and I-Hec, respectively) and good thermal stability up to 800 • C. Both materials also present strong blue-green emission under UV radiation and short persistent luminescence (ca. 5 s). The luminescence features are attributed to Ti 3+ /Ti IV impurities acting as the emitting center in these materials.

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The correlation of the 7.6 eV optical absorption band in pure fused silicon dioxide with twofold-coordinated silicon

Cited by 54 publications

References 7 publications

Luminescence of silicon Dioxide — silica glass, α-quartz and stishovite

Luminescence of silicon Dioxide — silica glass, α-quartz and stishovite

Direct Growth and Photoluminescence of SiOx Nanowires and Aligned Nanocakes by Simple Carbothermal Evaporation

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

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