Correlation between structural and optical properties of Si nanocrystals embedded in SiO2: The mechanism of visible light emission

2000 ◽  
Vol 77 (20) ◽  
pp. 3143-3145 ◽  
Author(s):  
B. Garrido ◽  
M. López ◽  
O. González ◽  
A. Pérez-Rodrı́guez ◽  
J. R. Morante ◽  
...  
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Light Emission ◽  
Structural And Optical Properties ◽  
Si Nanocrystals ◽  
Visible Light Emission

scholarly journals Defect‐related versus excitonic visible light emission from ion beam synthesized Si nanocrystals in SiO2

1996 ◽  
Vol 69 (14) ◽  
pp. 2033-2035 ◽  
Author(s):  
K. S. Min ◽  
K. V. Shcheglov ◽  
C. M. Yang ◽  
Harry A. Atwater ◽  
M. L. Brongersma ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Emission ◽  
Ion Beam ◽  
Si Nanocrystals ◽  
Visible Light Emission

Correlation between Structural and Optical Properties of Si Nanocrystals in SiO2: Model for the Visible Light Emission

2000 ◽  
Vol 650 ◽  
Author(s):  
M. López ◽  
B. Garrido ◽  
O. González ◽  
C. García ◽  
A. Pérez-Rodríguez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Band Gap ◽  
Crystallite Size ◽  
Light Emission ◽  
Stokes Shift ◽  
High Resolution Electron Microscopy ◽  
Dark Field ◽  
Structural And Optical Properties ◽  
Si Nanocrystals

ABSTRACTThe correlation between the structural and optical properties of Si nanocrystals embedded in SiO2 is the key factor to understand their emission mechanism. However, there is a great difficulty in imaging Si nanocrystals in SiO2 and measuring their size distribution because of the lack of contrast in electron microscopy. We have used here a new method for imaging Si nanocrystals by using high resolution electron microscopy in conjunction with conventional electron microscopy in dark field conditions. Regarding the optical properties, the band-gap energies and photoluminescence have been measured by direct and independent methods. The results have allowed experimental determination, for the first time in this material, of the experimental Stokes shift between absorption and emission as a function of crystallite size. The experimental band-gap versus size correlates well with the most accurate theoretical predictions. Moreover, the photoluminescence energy emission versus crystallite size shows a parallel behaviour to that of band-gap energy. Consequently, the experimental Stokes shift is independent of nanocrystal size and is found to be 0.26±0.03 eV. This value is almost twice the energy of the Si-O vibration (0.134 eV). These results suggest that the dominant emission of Si nanocrystals passivated with SiO2 is a fundamental transition spatially located at the Si-SiO2 interface and with the assistance of a local Si-O vibration.

Correlation between Structural and Optical Properties of Si Nanocrystals in SiO2: Model for the Visible Light Emission

2000 ◽  
Vol 647 ◽  
Author(s):  
M. López ◽  
B. Garrido ◽  
O. González ◽  
C. García ◽  
A. Pérez-Rodríguez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Band Gap ◽  
Crystallite Size ◽  
Light Emission ◽  
Stokes Shift ◽  
High Resolution Electron Microscopy ◽  
Dark Field ◽  
Structural And Optical Properties ◽  
Si Nanocrystals

AbstractThe correlation between the structural and optical properties of Si nanocrystals embedded in SiO2 is the key factor to understand their emission mechanism. However, there is a great difficulty in imaging Si nanocrystals in SiO2 and measuring their size distribution because of the lack of contrast in electron microscopy. We have used here a new method for imaging Si nanocrystals by using high resolution electron microscopy in conjunction with conventional electron microscopy in dark field conditions. Regarding the optical properties, the band-gap energies and photoluminescence have been measured by direct and independent methods. The results have allowed experimental determination, for the first time in this material, of the experimental Stokes shift between absorption and emission as a function of crystallite size. The experimental band-gap versus size correlates well with the most accurate theoretical predictions. Moreover, the photoluminescence energy emission versus crystallite size shows a parallel behaviour to that of band-gap energy. Consequently, the experimental Stokes shift is independent of nanocrystal size and is found to be 0.26±0.03 eV. This value is almost twice the energy of the Si-O vibration (0.134 eV). These results suggest that the dominant emission of Si nanocrystals passivated with SiO2 is a fundamental transition spatially located at the Si-SiO2 interface and with the assistance of a local Si-O vibration.

Temperature sensitive optical properties of exciton and room-temperature visible light emission from disordered Cu2O nanowires

RSC Advances ◽  
2014 ◽  
Vol 4 (71) ◽  
pp. 37542-37546 ◽  
Author(s):  
Peng Wang ◽  
Xinhong Zhao ◽  
Hairong Li ◽  
Lingshan Li ◽  
Jing Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
White Light ◽  
Room Temperature ◽  
Light Emission ◽  
Temperature Sensitive ◽  
Excitonic Emission ◽  
First Time ◽  
Visible Light Emission

The excitonic emission of the Cu2O nanowires are demonstrated, and a visible white light is observed for the first time.

Scanning luminescence x-ray microscopy: Progress toward selective staining using microspheres

1994 ◽  
Vol 52 ◽  
pp. 74-75
Author(s):  
C. Jacobsen ◽  
J. Fu ◽  
S. Mayer ◽  
Y. Wang ◽  
S. Williams
Keyword(s):  
Visible Light ◽  
Active Sites ◽  
Light Emission ◽  
Chinese Hamster ◽  
Polystyrene Spheres ◽  
Good Resistance ◽  
X Ray ◽  
Selective Staining ◽  
Visible Light Emission ◽  
Specific Labelling

In scanning luminescence x-ray microscopy (SLXM), a high resolution x-ray probe is used to excite visible light emission (see Figs. 1 and 2). The technique has been developed with a goal of localizing dye-tagged biochemically active sites and structures at 50 nm resolution in thick, hydrated biological specimens. Following our initial efforts, Moronne et al. have begun to develop probes based on biotinylated terbium; we report here our progress towards using microspheres for tagging.Our initial experiments with microspheres were based on commercially-available carboxyl latex spheres which emitted ~ 5 visible light photons per x-ray absorbed, and which showed good resistance to bleaching under x-ray irradiation. Other work (such as that by Guo et al.) has shown that such spheres can be used for a variety of specific labelling applications. Our first efforts have been aimed at labelling ƒ actin in Chinese hamster ovarian (CHO) cells. By using a detergent/fixative protocol to load spheres into cells with permeabilized membranes and preserved morphology, we have succeeded in using commercial dye-loaded, spreptavidin-coated 0.03μm polystyrene spheres linked to biotin phalloidon to label f actin (see Fig. 3).

Novel Process for Visible Light Emission from Si Prepared by Ion Irradiation

1992 ◽  
Vol 31 (Part 2, No. 5A) ◽  
pp. L560-L563 ◽  
Author(s):  
Yukinori Ochiai ◽  
Norio Ookubo ◽  
Heiji Watanabe ◽  
Shinji Matsui ◽  
Yasunori Mochizuki ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Emission ◽  
Ion Irradiation ◽  
Visible Light Emission

Impact ionization, recombination, and visible light emission in AlGaAs/GaAs high electron mobility transistorsa)

1991 ◽  
Vol 70 (1) ◽  
pp. 529-531 ◽  
Author(s):  
Enrico Zanoni ◽  
Alessandro Paccagnella ◽  
Pietro Pisoni ◽  
Paolo Telaroli ◽  
Carlo Tedesco ◽  
...  
Keyword(s):  
Visible Light ◽  
Electron Mobility ◽  
Impact Ionization ◽  
Light Emission ◽  
High Electron ◽  
High Electron Mobility ◽  
Visible Light Emission

scholarly journals Tailorable, visible light emission from silicon nanocrystals

1999 ◽  
Vol 74 (21) ◽  
pp. 3164-3166 ◽  
Author(s):  
J. P. Wilcoxon ◽  
G. A. Samara
Keyword(s):  
Visible Light ◽  
Silicon Nanocrystals ◽  
Light Emission ◽  
Visible Light Emission
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