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関連する概念動画

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

1.6K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
1.6K
P-N junction01:11

P-N junction

469
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
469
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

489
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
489
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

31.8K
sp3d and sp3d 2 Hybridization
31.8K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

5.7K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
5.7K
Biasing of P-N Junction01:16

Biasing of P-N Junction

431
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...
431

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関連する実験動画

Updated: Jun 9, 2025

Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
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Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials

Published on: January 5, 2019

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ブラック・フォスファルスの明るい刺激子

Milorad V Milošević1,2, Lucian Covaci1,2

  • 1Department of Physics, University of Antwerp, Antwerp, Belgium.

Science (New York, N.Y.)
|October 31, 2024
PubMed
まとめ

歪んだ原子層は 量子光電子学の 汎用性のあるプラットフォームを提供します この調節性により,新しい電子機器における光物質の相互作用を正確に制御できます.

科学分野:

  • 凝縮物質物理学
  • 量子光学
  • 材料科学

背景:

  • 原子的に薄い物質であるグラフェンや 移行金属二カルコゲニドは 独特の電子と光学特性を有しています
  • この2次元物質の積み重ねと歪みにより モイレの超格子が生み出され 量子現象が生じます
  • 量子オプトエレクトロニクスは,光と電子信号を操作するための量子力学的効果を活用することを目的としています.

研究 の 目的:

  • 先進的な量子光電子アプリケーションのための歪んだヴァン・デル・ワールスの異質構造の可能性を調査する.
  • コントロールされた層の回転を通して光電子特性の調節性を実証する.
  • 折りたたまれた層状の材料で光と物質の相互作用を探求する.

主な方法:

  • 制御された回転角度を持つヴァン・デル・ワールスのヘテロ構造の製造.
  • 電子帯構造の特徴付けは,角度解像度光放射スペクトロスコーピー (ARPES) のような技術を用いて行われます.
  • 光学スペクトロスコーピー (例えば,光発光,吸収) で,光と物質の相互作用とエクシトンダイナミクスを探求する.

主要な成果:

  • バンドの隙間と光学特性の重要な変化を,回転角の関数として観察する.
  • 歪んだシステムにおける調節可能なエクシトンエネルギーと寿命の実証.

さらに関連する動画

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

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

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関連する実験動画

Last Updated: Jun 9, 2025

Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials
10:18

Exfoliation and Analysis of Large-area, Air-Sensitive Two-Dimensional Materials

Published on: January 5, 2019

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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

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

Published on: May 31, 2018

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  • 歪んだ層の材料におけるモアールポテンシャルから生じる新しい量子状態の証拠

    • 結論:

    • 歪んだ層の材料は,量子光電子装置を設計するための高度な調節可能なプラットフォームを提供します.
    • 光と電荷を運ぶ装置を操作する 新しい可能性が生まれます
    • このアプローチは,機能が強化された次世代の光電子技術への道を開きます.