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Related Concept Videos

Semiconductors01:22

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.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Types of Semiconductors01:20

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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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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Updated: Dec 27, 2025

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

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Organic semiconductors for visible light communications.

Pavlos P Manousiadis1, Kou Yoshida1, Graham A Turnbull1

  • 1Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 3, 2020
PubMed
Summary

Organic semiconductors offer tunable properties for flexible optoelectronic devices. Their unique characteristics are now being explored for visible light communications (VLC), enabling advanced data transmission and power harvesting applications.

Keywords:
Li-Ficolour convertersfluorescent antennasorganic light-emitting diodeorganic photovoltaic

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Organic Electronics

Background:

  • Organic semiconductors are versatile materials with tunable properties and simple fabrication processes.
  • While primarily used for displays and lighting, their unique characteristics are suitable for novel applications.
  • Visible Light Communications (VLC) is an emerging field for optical wireless communication.

Purpose of the Study:

  • To explain the suitability of organic semiconductors for VLC.
  • To review current and potential applications of organic semiconductors in VLC systems.
  • To highlight advancements in organic semiconductor-based VLC transmitters and receivers.

Main Methods:

  • Review of existing literature on organic semiconductors in VLC.
  • Analysis of performance metrics for organic semiconductor-based VLC components.
  • Discussion of fabrication techniques for flexible optoelectronic devices.

Main Results:

  • Organic semiconductors achieve record white VLC communication as color converters.
  • Direct modulation of organic light-emitting diodes (OLEDs) is feasible for VLC.
  • Organic solar cells enable simultaneous power and data harvesting in VLC receivers.
  • Fluorescent antennas provide fast, sensitive receivers with a wide field of view.

Conclusions:

  • Organic semiconductors are highly promising for diverse VLC applications, from transmitters to receivers.
  • Further development could lead to efficient and flexible optical wireless communication systems.
  • This technology has the potential to enhance data communication and energy harvesting.