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Related Concept Videos

Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
Cell Diagrams and IUPAC Conventions01:21

Cell Diagrams and IUPAC Conventions

Electrochemical cell notation is a standardized symbolic representation that communicates the structure and reaction pathway of galvanic and electrolytic cells. This notation plays a critical role in describing redox reactions and electrochemical cell configurations without the need for detailed diagrams.In electrochemical cell notation, a single vertical line “|” denotes a phase boundary, such as between a solid electrode and an aqueous solution. A double vertical line “||” represents a salt...
Electromotive Force02:36

Electromotive Force

Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
Concentration Cells01:29

Concentration Cells

A concentration cell is an electrochemical cell in which the emf arises from a difference in concentration of a species between two half-cells. Unlike galvanic cells, where electrical energy comes from a chemical reaction, the driving force here is the transfer of matter from a region of higher concentration to lower concentration. The overall process is therefore physical in nature. A classic illustration is a cell made of two chlorine electrodes operating at different chlorine gas...
Electrodes: Overview01:17

Electrodes: Overview

Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...
Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...

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Updated: May 30, 2026

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
05:51

Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes

Published on: November 15, 2016

White light-emitting electrochemical cell.

Shi Tang1, Junyou Pan, Herwig Buchholz

  • 1The Organic Photonics and Electronics Group, Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.

ACS Applied Materials & Interfaces
|July 29, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a new light-emitting electrochemical cell (LEC) with stable electrodes and a single-layer material. This device emits bright, warm-white light efficiently at low voltages, demonstrating good operational stability.

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photonic Devices

Background:

  • Light-emitting electrochemical cells (LECs) offer potential for low-cost lighting.
  • Previous LECs often faced challenges with electrode stability and efficiency.
  • Achieving stable, high-performance white-light emission from LECs remains an active research area.

Purpose of the Study:

  • To develop a stable, solution-processed, single-layer LEC for warm-white light emission.
  • To characterize the performance metrics including brightness, efficiency, turn-on time, and operational stability.
  • To investigate the performance of blue LECs and identify pathways for improving white-emitting LECs.

Main Methods:

  • Fabrication of a light-emitting electrochemical cell (LEC) using air-stable electrodes.
  • Utilization of a solution-processed, single-layer active material for light emission.
  • Performance testing including brightness, color rendering index, turn-on time, efficiency, and operational stability measurements.

Main Results:

  • A warm-white emitting LEC (CIE: (0.39, 0.43), CRI: 83) was achieved with significant brightness at low voltage.
  • The trichromatic device demonstrated a fast turn-on time (∼5 s), high efficiency (3.1 cd/A), and good stability (17 h).
  • A blue LEC showed a turn-on time of ∼5 s, efficiency of 3.6 lm/W, and 25 h operational lifetime.

Conclusions:

  • The developed LEC technology offers a promising route to efficient and stable white-light emission.
  • Analysis of device data provides insights for further performance enhancement of white-emitting LECs.
  • The study highlights the potential of solution-processed, single-layer materials for advanced lighting applications.