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相关概念视频

Biasing of P-N Junction01:16

Biasing of P-N Junction

548
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...
548
Diode: Reverse bias01:14

Diode: Reverse bias

755
A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
755
Diode: Forward bias01:20

Diode: Forward bias

1.1K
In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
1.1K
The Ideal Diode01:15

The Ideal Diode

856
A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
856
Half wave rectifier01:20

Half wave rectifier

1.2K
A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
1.2K
AC Sources01:20

AC Sources

3.0K
Direct current is a flow of electric charge in only one direction and has a steady state of constant voltage in the circuit. Rectifiers, batteries, commutator-equipped generators, and fuel cells are some examples of devices that generate direct current. Nowadays, most applications use a time-varying voltage source. Alternating current is a flow of electric charge that periodically reverses direction. An alternating current is produced by an alternating emf that is generated in a power plant. If...
3.0K

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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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双向发光二极管作为可见光源,由交流电驱动.

Mikołaj Żak1, Grzegorz Muziol2, Marcin Siekacz2

  • 1Institute of High Pressure Physics Polish Academy of Sciences, Sokołowska 29/37, 01-142, Warsaw, Poland. mzak@unipress.waw.pl.

Nature communications
|November 21, 2023
PubMed
概括

本研究介绍了一种双向化发光二极管 (LED),该二极管直接使用交流电 (AC) 工作. 这种新型设备在两种电流方向发光,简化了交流电动照明应用.

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科学领域:

  • 固态物理 固态物理
  • 材料科学 材料科学 材料科学
  • 光电学是指光电子产品.

背景情况:

  • 化 (GaN) 发光二极管 (LED) 是高能效的光源.
  • 传统的LED需要直流 (DC),这给与交流电网的集成带来了挑战.
  • 现有的LED交流驱动的解决方案往往涉及复杂的功率转换电路.

研究的目的:

  • 展示基于GaN的双向发光二极管 (Bi-LED) 的概念验证.
  • 在DC和AC条件下研究双LED的光学和电气特性.
  • 探索堆叠双LED的潜力,以提高光学输出功率.

主要方法:

  • 制造一个对称的基于GaN的双LED结构,其中包括一个由两个道连接点绕的活跃区域.
  • 在不同的直流和交流偏差条件下对双LED的光学发射特性进行表征.
  • 当双LED连接成系列 (垂直堆叠) 时,对电气性能和光输出进行评估.

主要成果:

  • 制造的Bi-LED在向前和向后两种方向的电流流下成功发光.
  • 分析了光学和电气特性,证实了在直流和交流电源下的功能.
  • 双LED的垂直堆叠展示了一种方法来增加整体光学输出功率.

结论:

  • 双LED为直接交流电源运行提供了可行的解决方案,消除了对外部整流器的需求.
  • 这些设备代表了一类新的半导体光源,适合简化交流驱动照明.
  • 双LED的垂直集成提供了一个可扩展的方法来实现更高的光强度.