Luminescence of Silica

Ewles, J.

doi:10.1038/165812a0

Cited by 11 publications

(8 citation statements)

References 3 publications

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“…28−30 It is well-known that diamond consists of sp 3 carbon while graphite is sp 2 carbon. As revealed by 13 C NMR measurements, the C dots only contained sp 3 carbon with signals in δ = 8−50 ppm range (Figure S7), instead of sp 2 carbon in the δ = 90− 180 ppm range. This further evidence that the crystalline C dots are diamond-like rather than graphitic structure.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

“…XPS measurements were carried out with a Thermo ESCALAB 250 high performance electron spectrometer with an Al Kα (1486.6 eV) radiation. 13 C NMR spectra were performed on a Bruker 100 MHz Ultrashield spectrometer by dissolving carbon dots in D 2 O. The values for CIE coordinates (Commission Internationale de l'eclairage), the color-coordinated temperature (CCT), and color rendering index (CRI) of the SiO 2 NPs were obtained using a HAAS-2000 color analyzer equipped with a CCD detector (Yuanfang, Hangzhou, China).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…A prevalent strategy is to assemble various nanomaterials with different emission colors (blue, green, and red) into an optically transparent matrix to obtain a synthetic white-light emission . Colloidal SiO 2 nanoparticles (NPs) are such an excellent matrix without self-emission or just very weak blue emission due to the defects in SiO 2 matrix . Various emission species including emission-tunable semiconductor quantum dots , and upconversional nanocrystals , besides conventional dyes and lanthanides can be introduced into the SiO 2 matrix during their synthesis or post-treatment .…”

Section: Introductionmentioning

confidence: 99%

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Strong Infrared Laser Ablation Produces White-Light-Emitting Materials via the Formation of Silicon and Carbon Dots in Silica Nanoparticles

Liu

Zhao

Zhang³

et al. 2015

J. Phys. Chem. C

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White-light-emitting materials for the applications in display and lighting have widely been prepared by the rare earth with high photoluminescent efficiency and stability, but the short resource, high cost, and serious environmental concerns are the insurmountable barriers of rare-earth-based materials. Here, we report that strong laser ablation of common organosilica colloid can produce white-light-emitting silica nanoparticles. The instant high temperature and pressure induced by strong laser simultaneously caused the reduction of partial silica and the pyrolysis of carbon chains in the interior of silica nanoparticles, in which the rapid crystallizations of the silicon and carbon vapor led to the formations of silicon dots and diamond-like carbon dots in the silica matrix. Significantly, the resultant silica nanoparticles containing different sized silicon and diamond dots exhibited a wide fluorescence spectrum to display bright white light under UV excitation. Moreover, the light emission diode (LED) device prepared by using the ablated silica nanoparticles as light source gave off the warm white light with Commission Internationale de l'Eclairage (CIE) coordinates (0.34, 0.32). The strategy reported here opens a new window to the exploration of white-light-emitting materials through the very simple, inexpensive, and environment-friendly pathway.

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Section: ■ Results and Discussionmentioning

confidence: 93%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strong Infrared Laser Ablation Produces White-Light-Emitting Materials via the Formation of Silicon and Carbon Dots in Silica Nanoparticles

Liu

Zhao

Zhang³

et al. 2015

J. Phys. Chem. C

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“…Our speculation is based on the following points: First, the ultrahigh temperature generated by laser irradiation can lead to the breaking of some Si−O bonds. 43 A similar case, the observation of superdense aluminum, occurred when α-Al 2 O 3 was irradiated by laser. 44 The appearance of voids at the Si/SiO 2 interface after microexplosion 17 also indicates the oxygen dissociation from the SiO 2 .…”

mentioning

confidence: 85%

“…We thus speculate an alternative pathway to form metastable Si phases during this microexplosion experiment: some new Si phases, specifically Si 10 , may result from the disintegration of plasma-state silica rather than phase transition of silicon. Our speculation is based on the following points: First, the ultrahigh temperature generated by laser irradiation can lead to the breaking of some Si–O bonds . A similar case, the observation of superdense aluminum, occurred when α-Al 2 O 3 was irradiated by laser .…”

mentioning

confidence: 95%

Si₁₀: A sp³ Silicon Allotrope with Spirally Connected Si₅ Tetrahedrons

Luo

Zhao

et al. 2016

Chem. Mater.

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SUPPORTING INFORMATION ContentsCalculation Details.Supplementary Table 1: mechanical properties of Si 10 and Si-I. Supplementary Table 2: comparison of the calculated d-spacings of Si 10 with the observed values in the experiment. Supplementary Table 3: simulated electron diffraction data of Si 10 .Supplementary Figure 1: comparison of imaginary part of dielectric function and optical absorption coefficient of Si 10 with that of Si-I phase.Supplementary Figure 2: simulated electron diffraction patterns of Si 10 phase along a specific zone axis compared with the experimental data. Supplementary Figure 3: simulated electron diffraction patterns of Si 10 phase along different crystal zone axes compared with the experimental data.References.

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