Luminescence properties of II/VI semiconductor colloidal nanocrystals at collective and single scales

Colloidal nanocrystals are crystalline spheres of semiconductors of a few nanometers, obtained by chemical synthesis. At this size scale, lower than Bohr radius of the exciton, emission properties are dominated by quantum confinement effects and depend crucially on the nanocrystal radius, which can...

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Bibliographic Details
Main Authors: Vion, Céline, Barthou, Carlos, Coolen, Laurent, Bennaloul, Paul, Chinh, Vu Duc, Linh, Pham Thuy, Bich, Vu Thi, Nga, Pham Thu, Maître, Agnès
Format: Conference Proceeding
Language:English
Subjects:
Biological properties
Blinking
Cadmium selenides
Chemical synthesis
Colloids
Crystal defects
Crystal structure
Crystallinity
Decay rate
Emission
Emitters
Excitons
Fine structure
Fluorescence
Light sources
Luminescence
Materials science
Nanocrystals
Optical properties
Optoelectronic devices
Physics
Quantum confinement
Quantum dots
Quantum efficiency
Room temperature
Temperature effects
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Summary:Colloidal nanocrystals are crystalline spheres of semiconductors of a few nanometers, obtained by chemical synthesis. At this size scale, lower than Bohr radius of the exciton, emission properties are dominated by quantum confinement effects and depend crucially on the nanocrystal radius, which can be controlled by adjusting the synthesis parameters. Nanocrystals present high photostability and good quantum efficiency, even at room temperature. Their emission wavelength can be tuned over the whole visible range, making them very attractive solid state light sources which are already used in optoelectronic devices or for biological labeling. The luminescence properties of CdSe colloidal nanocrystals synthesized at the Institute of Materials Science in Hanoi are presented. At collective scale, the emission properties reveal the synthesis quality. Temperature effects from ambient to 4 K on spectra and decay rates will be presented and analyzed in terms of emitting level fine structure. The study of CdSe colloidal quantum dots at the single emitter scale is of great interest as it reveals properties which are hidden by collective studies, such as luminescence "blinking", a random switching from a fluorescent to a non fluorescent state, which is closely related to the crystalline defects of a nanocrystal and its interaction with its environment. We will present the blinking properties of the prepared nanocrystals, and relate them to the nanocrystals synthesis quality and shell quality.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/187/1/012018