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Related Concept Videos

Electrical Energy01:10

Electrical Energy

1.5K
Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules.
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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Related Experiment Video

Updated: Nov 27, 2025

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Performance Limits of an Alternating Current Electroluminescent Device.

Vivian Wang1,2, Yingbo Zhao1,2, Ali Javey1,2

  • 1Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, CA, 94720, USA.

Advanced Materials (Deerfield Beach, Fla.)
|December 3, 2020
PubMed
Summary

Alternating current (AC) electroluminescent devices offer versatile light emission without complex engineering. These AC devices overcome limitations of direct current (DC) systems, enabling efficient performance with simpler material processing.

Keywords:
alternating currentcarbon nanotubeselectroluminescencelight-emitting devices

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Electroluminescence (EL) is crucial for lighting and displays.
  • Conventional direct current (DC) electroluminescent devices require precise material energy level alignment and uniform thin films.
  • Alternating current (AC) voltage offers a simpler method for inducing electroluminescence without complex contact engineering.

Purpose of the Study:

  • To comprehensively study performance trade-offs in AC-driven, capacitive electroluminescent devices with carbon nanotube network contacts.
  • To enhance the understanding of the mechanism and capabilities of AC-driven electroluminescent devices compared to DC-driven schemes.
  • To explore the optimization of device geometry, driving parameters, and material characteristics for tunable performance.

Main Methods:

  • Comprehensive device simulations were performed.
  • Illustrative experiments were conducted to validate simulation findings.
  • Analysis focused on AC-driven electroluminescent devices utilizing carbon nanotube network contacts.

Main Results:

  • AC-driven electroluminescent devices overcome limitations of DC devices, such as strict energy level alignment and uniform film requirements.
  • Turn-on voltage in AC devices approaches the emitting material's bandgap with scaled gate oxide thickness.
  • Efficient electroluminescence is achievable with low-mobility, single-layer emitter films, irrespective of thickness and energy barrier variations.

Conclusions:

  • AC-driven electroluminescent devices provide a flexible platform for light emission across the infrared-to-ultraviolet spectrum.
  • Optimizing device parameters allows for tuning the performance of these AC electroluminescent systems.
  • The study demonstrates the potential of AC schemes for simplified and efficient electroluminescent device fabrication and operation.