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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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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...
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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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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...
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Types of Semiconductors01:20

Types of Semiconductors

1.4K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Sensing with photoluminescent semiconductor quantum dots.

Margaret Chern1, Joshua C Kays2, Shashi Bhuckory2

  • 1Department of Materials Science and Engineering, Boston University, Boston, United States of America.

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Quantum dots (QDs) offer superior optical properties for advanced fluorescent sensors, enabling sensitive detection. Innovations in bioconjugation and detection are paving the way for wider QD sensor applications.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Fluorescent sensors offer high signal-to-noise ratios and design flexibility.
  • Semiconductor nanocrystal quantum dots (QDs) possess exceptional optical properties, including high stability and brightness, surpassing traditional organic dyes and fluorescent proteins.
  • QD emission color is tunable across a wide spectrum (UV to NIR) due to quantum confinement, ensuring high color purity.

Purpose of the Study:

  • To explore the diverse applications of quantum dots (QDs) in fluorescent sensor technology.
  • To highlight the advantages of QDs, such as their photophysical properties and versatility in sensor design.
  • To discuss the potential of QDs in various sensing modalities, from simple tags to complex energy transfer systems.

Main Methods:

  • Utilizing QDs as fluorescent tags in assays.
  • Developing intrinsic sensors that leverage QDs' photophysical responses to environmental changes (temperature, electric field, ion concentration).
  • Implementing energy transfer mechanisms (FRET, NSET, charge/electron transfer) with QDs as donors, acceptors, or both, modulated by biomolecular recognition moieties.

Main Results:

  • QD-based sensors demonstrate sensitive detection through spectral response and photoluminescent lifetime changes.
  • Multiplexed sensing devices have been successfully developed using QD technology.
  • QDs function effectively as donors, acceptors, or both in energy transfer-based sensing configurations.

Conclusions:

  • Quantum dots are highly versatile fluorophores for advanced sensor development due to their unique optical and stability characteristics.
  • Ongoing advancements in bioconjugation techniques and detection methods, including the use of consumer devices, are reducing barriers to the clinical and commercial adoption of QD-based sensing.
  • QD-based sensing technologies hold significant promise for sensitive and multiplexed detection across various applications.