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Table of contents
Introduction
I CdSe/CdS colloidal nanocrystals
Introduction
I.1 Electronic structure of CdSe nanocrystals
I.1.1 From bulk CdSe to quantum confined nanocrystals
I.1.2 Fine structure of the band-edge exciton
I.2 Optical transitions and relaxation processes
I.2.1 Highly excited states and absorption
I.2.2 Non-radiative relaxation processes in nanocrystals
I.2.3 Quantum states and radiative relaxation
I.2.4 Quantum yields
I.3 Core/shell nanocrystals
I.3.1 Classification of core/shell heterostructures
I.3.2 CdSe/CdS nanocrystals: quasi-type II heterostructures and wavefunction engineering
I.3.3 Nanorods
I.3.4 CdSe/CdS dot-in-rods
I.4 Studied Samples
I.4.1 Samples geometry
I.4.2 Samples spectra
Conclusion
II Experimental setup and methods
Introduction
II.1 Setup description
II.1.1 Standard microscopy setup
II.1.2 Polarization microscopy
II.1.3 Defocused microscopy
II.1.4 Collection efficiency
II.2 Measurements and data processing
II.2.1 Sample preparation
II.2.2 Noise
II.2.3 Excitation power and saturation curves
II.2.4 Data acquisition and processing
Conclusion
IIICdSe/CdS dot-in-rods blinking statistics
Introduction
III.1 Blinking: a review
III.1.1 Two types of blinking
III.1.2 Reduced blinking
III.2 Dot-in-rods blinking statistics
III.2.1 Type A blinking
III.2.2 Blinking timescales and statistics
Conclusion
IV CdSe/CdS dot-in-rods photon statistics
Introduction
IV.1 Photon statistics theory
IV.1.1 A general approach to the photon statistics
IV.1.2 Photon statistics and nanocrystals
IV.2 Single photon emission: exciton and negative trion
IV.2.1 Saturation and exciton quantum yield
IV.2.2 Trion quantum yield and electron delocalization
IV.3 Two photon emission: biexciton and charged biexciton
IV.3.1 Dot-in-rod geometry and biexciton quantum yield
IV.3.2 Blinking and charged biexciton emission
IV.4 Measuring the photon statistics with an ICCD camera
Conclusion
V CdSe/CdS dot-in-rods emission polarization
Introduction
V.1 Dot-in-rods polarization: an overview
V.1.1 Ensemble measurement methods
V.1.2 Dielectric effects
V.1.3 Fine structure
V.1.4 Polarization and c axis
V.2 Polarization of the emission and geometrical parameters
V.2.1 Measurements procedure
V.2.2 Measurements
V.3 Discussion
V.3.1 Comparison with the literature
V.3.2 A model for the emission polarization
V.3.3 Simulations of the emission polarization
Conclusion
VI Coupling nanocrystals to devices: towards integrated nanophotonics
Introduction
VI.1 Coupling nanocrystals to ZnO nanowires
VI.1.1 System description
VI.1.2 Passive/Active excitation
VI.1.3 Losses and excitation efficiency
VI.1.4 Outlook
VI.2 Orientation of CdSe/CdS dot-in-rods using liquid crystals
VI.2.1 Orientation and positioning of nanoparticles
VI.2.2 The liquid crystal samples
VI.2.3 Polarization microscopy of dot-in-rods inside a liquid crystal
VI.2.4 Outlook
Conclusion
Conclusions and outlook
A CdSe/CdS dot-in-rods emission at cryogenic temperature
B Coupling CdSe/CdS dot-in-rods to a parabolic mirror
