Strong White Photoluminescence from Carbon-Incorporated Silicon Oxide Fabricated by Preferential Oxidation of Silicon in Nano-Structured Si:C Layer

Vasin, A. V.; Ishikawa, Yukari; Shibata, Noriyoshi; Salonen, Jarno; Lehto, Vesa‐Pekka

doi:10.1143/jjap.46.l465

Cited by 31 publications

(23 citation statements)

References 20 publications

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“…12,14) The PL intensity of SiOC seems to increase with surface area, as suggested by some reports that PL origins might be at the interface between carbon and silica. 12,14) Recently, we have found that mesoporous carbon-silica (MPCS) 13,15,16) that has a large surface area emits a strong white PL. In our previous studies, we found that PL intensity depends on hydrolysis and polycondensation reactions in the sol-gel method for preparing MPCS.…”

Section: Introductionmentioning

confidence: 79%

Effects of Synthesis Process on Luminescence Properties and Structure of Mesoporous Carbon–Silica Nanocomposite

Sato

Ishikawa

Ishii

et al. 2012

Jpn. J. Appl. Phys.

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The effects of hydrolysis and polycondensation reactions for synthesizing light-emitting mesoporous carbon-silica (MPCS) nanocomposite on the structure, chemical bonding state, and luminescence properties of MPCS were investigated by controlling the concentration (0.02 to 5 M) of HCl, which was used as a catalyst for hydrolysis and polycondensation. The progress of hydrolysis and polycondensation reactions provides a nanometer-order pore/wall structure and results in a strong light-emitting property. The pore/wall structure was obtained using HCl at concentrations of 0.2 M and higher, but it became disordered with increasing HCl concentration (2 and 5 M). The luminescence color of the MPCS nanocomposite can be changed from yellowish-white to bluish-white by changing the concentration of HCl.

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Section: Introductionmentioning

confidence: 79%

Effects of Synthesis Process on Luminescence Properties and Structure of Mesoporous Carbon–Silica Nanocomposite

Sato

Ishikawa

Ishii

et al. 2012

Jpn. J. Appl. Phys.

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“…Recently, it has been demonstrated that carbon incorporated silicon oxide nanostructured materials exhibit a strong white photoluminescence (PL). Intriguing is that white PL was demonstrated by SiOC materials fabricated by quite different methods, namely: SiOC thin films deposited by thermal chemical vapor deposition (TCVD) [1], atmospheric pressure microplasma jet deposition [2], magnetron sputtering deposition [3], C + implantation into SiO 2 [4][5][6], chemical vapor deposition technique [7], carbonization/oxidation of porous silicon [8,9], sol-gel method [10].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent properties of oxidized stochiometric and carbon-rich amorphous Si1-xCx:H films

Vasin¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Near-stochiometric and carbon-rich a-Si 1−x C x :H thin films were deposited using the magnetron sputtering of Si target in Ar/CH 4 gas mixture. As-deposited nearstochimetric (x = 0.5) sample showed weak blue photoluminescence (PL), while PL of as-deposited carbon-rich (x = 0.7) sample was 20 times stronger and white in color. The films were annealed in pure argon, wet argon, and dry oxygen at 450 °C for 30 min. The intensity of PL in a-Si 1−x C x :H layers were enhanced by the factor from 2 to 12 after annealing in dependence on the annealing atmosphere. The strongest oxidation and strongest light emission were observed in carbon-rich series (x = 0.7) after annealing in oxidizing atmosphere. Structural properties of the films were characterized by infra-red absorption spectroscopy, ellipsometry and electron paramagnetic resonance. The effect of carbon enrichment of a-Si 1−x C x :H films and annealing atmosphere on the evolution of photoluminescence and local interatomic bonding structure in annealed material were studied and analyzed. It has been found that main effects of thermal treatments is strong enhancement of photoluminescence accompanied by formation of Si:C-H n and Si-O x C y bonding. The strongest oxidation effect as well as strongest photoluminescence were observed in carbon-rich a-SiC:H films.

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“…Various fabrication methods of carbon incorporated silica were demonstrated [1,2] by several researchers. Recently, we reported oxidized mesoporous carbon-silica (MPCS) emits white PL and pointed out that light emitting function might be related to carbon-silica chemical bonding state and transmittance [3].…”

Section: Introductionmentioning

confidence: 99%

White light emitting Mesoporous Carbon-Silica Nanocomposite

Matsumura

Ishii

Sato

et al. 2011

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Visible photoluminescence (PL) from oxidized mesoporous carbon-silica nanocomposite (MPCS) prepared by the triconstituent co-assembly method is reported. White PL from MPCS was observed by naked eye at room temperature. Oxidation effects on carbonsilica bonding states and transmittance were investigated. PL intensity decreased with decreasing of carbon dangling bond density by oxidation at above 500 o C. The transmittance of MPCS at excitation and emission wavelengths increased with increasing of oxidation temperature. It is concluded that PL intensity is determined by the balance between PL related carbon density and transmittance. We proposed an additional wet oxidation that can increase PL intensity by the increase of transmittance under suppressing carbon desorption.

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Strong White Photoluminescence from Carbon-Incorporated Silicon Oxide Fabricated by Preferential Oxidation of Silicon in Nano-Structured Si:C Layer

Cited by 31 publications

References 20 publications

Effects of Synthesis Process on Luminescence Properties and Structure of Mesoporous Carbon–Silica Nanocomposite

Effects of Synthesis Process on Luminescence Properties and Structure of Mesoporous Carbon–Silica Nanocomposite

Photoluminescent properties of oxidized stochiometric and carbon-rich amorphous Si1-xCx:H films

White light emitting Mesoporous Carbon-Silica Nanocomposite

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