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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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Related Experiment Video

Updated: Jun 22, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Non-classical light emission from a single electrically driven quantum dot.

M Scholz, S Büettner, O Benson

    Optics Express
    |June 24, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed an electrically pumped quantum dot for quantum communication. This light source offers high spectral purity for single-photon emission, eliminating the need for filtering.

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    Compact Quantum Dots for Single-molecule Imaging
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    Compact Quantum Dots for Single-molecule Imaging

    Published on: October 9, 2012

    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
    12:57

    Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

    Published on: October 13, 2017

    Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
    10:41

    Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

    Published on: May 31, 2018

    Compact Quantum Dots for Single-molecule Imaging
    17:14

    Compact Quantum Dots for Single-molecule Imaging

    Published on: October 9, 2012

    Area of Science:

    • Quantum optics
    • Semiconductor devices

    Background:

    • Quantum communication technologies require reliable sources of non-classical light.
    • Existing light sources often necessitate complex filtering systems to achieve desired purity.

    Purpose of the Study:

    • To report on a novel quantum dot light source for quantum communication applications.
    • To demonstrate single-photon emission with high spectral purity from an electrically driven device.

    Main Methods:

    • Fabrication and characterization of an electrically pumped quantum dot.
    • Measurement of the spectral properties of the emitted photons.
    • Analysis of the single-photon emission characteristics.

    Main Results:

    • Demonstration of efficient single-photon emission from the quantum dot.
    • Achieved unprecedented spectral purity, surpassing existing benchmarks.
    • Confirmed the suitability of the source for quantum applications without external filtering.

    Conclusions:

    • The developed quantum dot is a promising, easy-to-handle light source for quantum communication.
    • Its high spectral purity simplifies system integration and reduces costs.
    • This work advances the development of practical quantum communication hardware.