Prab at 03:34, 4 May 2025

2025-05-04T03:34:20Z

← Older revision		Revision as of 03:34, 4 May 2025
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	[[file:QD_S.jpg\|thumb\|QD S]] [[file:Quantum_Dots_with_emission_maxima_in_a_10-nm_step_are_being_produced_at_PlasmaChem_in_a_kg_scale.jpg\|thumb\|Quantum Dots with emission maxima in a 10-nm step are being produced at PlasmaChem in a kg scale\|left~~]] [[file:Cadmium_sulfide_quantum_dots_on_cells_high_res.jpg\|thumb\|Cadmium sulfide quantum dots on cells high res~~]] [[file:Colloidal_nanoparticle_of_lead_sulfide_(selenide)_with_complete_passivation.png\|thumb\|Colloidal nanoparticle of lead sulfide (selenide) with complete passivation\|left]] [[file:Gaas_inas_quantum_dot.jpg\|thumb\|Gaas inas quantum dot]] [[file:CdTe_PlasmaChem_spectra-en.svg\|thumb\|CdTe PlasmaChem spectra-en]] == Quantum Dot ==		[[file:QD_S.jpg\|thumb\|QD S]] [[file:Quantum_Dots_with_emission_maxima_in_a_10-nm_step_are_being_produced_at_PlasmaChem_in_a_kg_scale.jpg\|thumb\|Quantum Dots with emission maxima in a 10-nm step are being produced at PlasmaChem in a kg scale\|left]] [[file:Colloidal_nanoparticle_of_lead_sulfide_(selenide)_with_complete_passivation.png\|thumb\|Colloidal nanoparticle of lead sulfide (selenide) with complete passivation\|left]] [[file:Gaas_inas_quantum_dot.jpg\|thumb\|Gaas inas quantum dot]] [[file:CdTe_PlasmaChem_spectra-en.svg\|thumb\|CdTe PlasmaChem spectra-en]] == Quantum Dot ==

	A '''quantum dot''' is a nanoscale particle of semiconductor material that confines the motion of electrons, holes, or excitons in all three spatial dimensions. Quantum dots are a central topic in [[nanotechnology]] and [[quantum computing]] due to their unique electronic properties, which arise from quantum mechanics.		A '''quantum dot''' is a nanoscale particle of semiconductor material that confines the motion of electrons, holes, or excitons in all three spatial dimensions. Quantum dots are a central topic in [[nanotechnology]] and [[quantum computing]] due to their unique electronic properties, which arise from quantum mechanics.

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[[file:QD_S.jpg|thumb|QD S]] [[file:Quantum_Dots_with_emission_maxima_in_a_10-nm_step_are_being_produced_at_PlasmaChem_in_a_kg_scale.jpg|thumb|Quantum Dots with emission maxima in a 10-nm step are being produced at PlasmaChem in a kg scale|left]] [[file:Cadmium_sulfide_quantum_dots_on_cells_high_res.jpg|thumb|Cadmium sulfide quantum dots on cells high res]] [[file:Colloidal_nanoparticle_of_lead_sulfide_(selenide)_with_complete_passivation.png|thumb|Colloidal nanoparticle of lead sulfide (selenide) with complete passivation|left]] [[file:Gaas_inas_quantum_dot.jpg|thumb|Gaas inas quantum dot]] [[file:CdTe_PlasmaChem_spectra-en.svg|thumb|CdTe PlasmaChem spectra-en]] == Quantum Dot ==

A '''quantum dot''' is a nanoscale particle of semiconductor material that confines the motion of electrons, holes, or excitons in all three spatial dimensions. Quantum dots are a central topic in [[nanotechnology]] and [[quantum computing]] due to their unique electronic properties, which arise from quantum mechanics.

=== Properties ===
Quantum dots exhibit discrete energy levels, similar to those of atoms, which is why they are sometimes referred to as "artificial atoms." The size of a quantum dot can be precisely controlled during its synthesis, allowing for the tuning of its electronic and optical properties. This size-dependent behavior is known as the [[quantum confinement effect]].

=== Synthesis ===
Quantum dots can be synthesized using various methods, including [[colloidal synthesis]], [[molecular beam epitaxy]], and [[electron beam lithography]]. Each method has its advantages and disadvantages in terms of control over size, shape, and surface properties.

=== Applications ===
Quantum dots have a wide range of applications, including:

* [[Quantum dot display]]s: Used in [[television]]s and [[monitor]]s for their superior color accuracy and brightness.
* [[Biomedical imaging]]: Quantum dots are used as fluorescent labels for imaging biological tissues.
* [[Solar cell]]s: Quantum dots can be used to improve the efficiency of [[photovoltaic]] cells.
* [[Quantum computing]]: Quantum dots are investigated as potential qubits for [[quantum computers]].

=== Challenges ===
Despite their potential, there are several challenges associated with the use of quantum dots, including:

* [[Toxicity]]: Some quantum dots contain heavy metals like [[cadmium]], which can be toxic.
* [[Stability]]: Quantum dots can degrade over time, affecting their performance.
* [[Scalability]]: Producing quantum dots on a large scale with consistent quality remains a challenge.

== See Also ==
* [[Nanoparticle]]
* [[Semiconductor]]
* [[Quantum mechanics]]
* [[Photoluminescence]]
* [[Exciton]]

== References ==
{{Reflist}}

== External Links ==
{{Commons category|Quantum dots}}

[[Category:Nanotechnology]]
[[Category:Quantum mechanics]]
[[Category:Semiconductors]]
[[Category:Quantum computing]]
[[Category:Optoelectronics]]

{{Nanotechnology-stub}}

Quantum dot - Revision history

Prab at 03:34, 4 May 2025

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