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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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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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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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对于高效的线性极化矿发光二极管的一致性编程.

Meiqin Xiao1, Jonghee Yang2, Wei Zhang3

  • 1Chongqing Key Laboratory of Micro&Nano Structure Optoelectronics, School of Physical Science and Technology, Southwest University, Chongqing 400715, China.

ACS nano
|October 10, 2024
PubMed
概括

研究人员开发了一种新方法,用于制造高效的线性极化矿发光二极管 (LP-PeLED). 这一突破克服了控制矿晶体方向和缺陷的先前挑战,使LP-PeLED的实际应用成为可能.

关键词:
发光二极管是一种发光二极管.线性极化线性的极化以增长为导向的增长.消极化是一种被动化.几乎2D的矿石.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 光电学是指光电子产品.
  • 固态化学 固态化学

背景情况:

  • 准二维 (quasi-2D) 矿由于具有异构结构,可以提供有效的线性极化电发光的潜力.
  • 线性极化矿发光二极管 (LP-PeLED) 的实际实施一直受到控制矿方向,相位分布和缺陷最小化方面的挑战的阻碍.

研究的目的:

  • 开发一种协同策略,用于制造具有控制方向和减少缺陷的准二维矿膜.
  • 为了实现过渡二极子时刻 (TDM) 的宏观对齐,以获得高效的线性极化发射.
  • 为了证明高效的LP-PeLED具有改进的性能和通信能力.

主要方法:

  • 整合了一个三甲基烯三烯酸固层,以引导沿着 (110) 平面指向矿的生长.
  • 使用18-Crown-6分子消极器来减少缺陷和同质化晶体相.
  • 为LP-PeLEDs制造一个"连贯编程的排放层".

主要成果:

  • 实现了准2D矿与对齐的TDMs的定向增长.
  • 已证明具有高外部量子效率 (∼23.7%) 和亮度 (∼36,142 cd/m2) 的LP-PeLED.
  • 在可见光通信系统中获得了高度的线性极化 (DoLP) ~38%,并改善了信号与干扰和噪声比.

结论:

  • 协同策略有效地控制了近二维矿的方向和相位,从而实现了高效的LP-PeLED.
  • 开发的LP-PeLED显示了用于光电子应用和可见光通信的有希望的性能.
  • 这项工作为准二维矿在偏光发射中的实际应用铺平了道路.