Optical Properties of CdTe Nanocrystal Quantum Dots, Grown in the Presence of Cd0Nanoparticles

2007 ◽  
Vol 111 (29) ◽  
pp. 10841-10847 ◽  
Author(s):  
Ruth Osovsky ◽  
Viki Kloper ◽  
Joanna Kolny-Olesiak ◽  
Aldona Sashchiuk ◽  
Efrat Lifshitz
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Cdte Nanocrystal ◽  
Nanocrystal Quantum Dots

Optical properties of PbSe nanocrystal quantum dots under pressure

2007 ◽  
Vol 90 (4) ◽  
pp. 043110 ◽  
Author(s):  
Kirill K. Zhuravlev ◽  
Jeffrey M. Pietryga ◽  
Robert K. Sander ◽  
Richard D. Schaller
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Nanocrystal Quantum Dots

Optical properties of PbS nanocrystal quantum dots at ambient and elevated pressure

2014 ◽  
Vol 16 (18) ◽  
pp. 8515-8520 ◽  
Author(s):  
Kaifu Bian ◽  
Benjamin T. Richards ◽  
Hanqing Yang ◽  
William Bassett ◽  
Frank W. Wise ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Optical Absorption ◽  
Diamond Anvil Cell ◽  
Elevated Pressure ◽  
Optical Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Scattering ◽  
Nanocrystal Quantum Dots ◽  
Diamond Anvil

We investigated pressure-dependent changes in the optical properties of PbS nanocrystal quantum dots (NQD) by combining X-ray scattering and optical absorption spectroscopy in a diamond anvil cell.

scholarly journals Exciton lifetimes of CdTe nanocrystal quantum dots in high magnetic fields

2011 ◽  
Vol 83 (3) ◽  
Author(s):  
J. H. Blokland ◽  
V. I. Claessen ◽  
F. J. P. Wijnen ◽  
E. Groeneveld ◽  
C. de Mello Donegá ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Magnetic Fields ◽  
High Magnetic Fields ◽  
Cdte Nanocrystal ◽  
Nanocrystal Quantum Dots

Optical and Electrical Properties of CdTe Nanocrystal Quantum Dots Passivated in Amorphous TiO2 Thin Film Matrix

1998 ◽  
Vol 536 ◽  
Author(s):  
A. C. Rastogi ◽  
S. N. Sharma ◽  
Sandeep Kohli
Keyword(s):  
Thin Film ◽  
Quantum Dots ◽  
Volume Fraction ◽  
Electrical Coupling ◽  
Theoretical Models ◽  
Nanocrystal Size ◽  
Quantum Size ◽  
Cdte Nanocrystal ◽  
Nanocrystal Quantum Dots ◽  
Amorphous Tio2

AbstractCdTe nanocrystal quantum dots sequestered in TiO2 thin film matrix have been synthesized by r.f. sputtering from a composite CdTe/TiO2 target. CdTe nanocrystal formation is nucleation controlled as their size (11-25 nm), dispersion and volume fraction (0.065-0.2) increases with film thickness, substrate temperature (100°C) and thermal treatment. The optical band gap derived from the onset of absorption coefficient showed blue shifts concurrent with the CdTe nanocrystal size reduction due to quantum size effects. These shifts, not consistent with theoretical models based on strong or weak confinement regimes, are explained on the basis of anisotropic growth and formation of CdTe nanocrystal clusters. TiO2, in addition to being an ideal passivator and providing a barrier for carrier confinement to observe quantum effects, shows O2 vacancy dependent conductivity modulation. Electrical conductivity variation with CdTe nanocrystal size and density is attributed to electrical coupling and tunneling behavior of carriers between CdTe nanocrystallites.

Nonlinear Optical Spectroscopy of Cadmium Chalcogenide Nanocrystals

2003 ◽  
Vol 780 ◽  
Author(s):  
J.T. Seo ◽  
Q. Yang ◽  
S. Creekmore ◽  
J. Mangana ◽  
J. Anderson ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Optical Power ◽  
Energy Transition ◽  
Nonlinear Spectroscopy ◽  
Exciton Absorption ◽  
Discrete Energy ◽  
Nonlinear Optical Spectroscopy ◽  
Cdte Nanocrystal

AbstractWe report on the nonlinear optical properties of cadmium telluride (CdTe) semiconductor colloidal quantum dots. Transmission electron microscopy measurements revealed that the size of CdTe nanocrystal quantum dots, dependent on the growth reaction time, was ∼2-10 nm or near the exciton Bohr radius. The strong blue-shifts of the CdTe, CdSe and CdS nanocrystal absorption spectra and the atomic-like discrete energy states of exciton indicate an exciton quantum confinement. These are completely different optical properties from the bulk crystals. The energy transition for exciton absorption was assigned as h1→e+, h2→e+, h1+→e-, and h2+→e- for the 1st, 2nd, 3rd and 4th exciton absorption peaks. Z-scan and I-scan nonlinear spectroscopy revealed that the CdTe nanocrystal quantum dot in toluene (∼8 × 10-5 mol/L) has the negative nonlinearity (self-defocusing) with ∼ -1 × 10-13 m2/W and a high nonlinear figure of merit of ∼200. For the optical power self-limiting experiment, the CdTe nanocrystal was almost opaque above ∼0.8 MW/cm2 at the position of z∼6.9 cm.

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