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関連する概念動画

Light as Energy01:35

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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関連する実験動画

Updated: Jul 5, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

固体光源は,スマートになりつつあります.

E Fred Schubert1, Jong Kyu Kim

  • 1Department of Electrical, Computer, and Systems Engineering and Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.

Science (New York, N.Y.)
|May 28, 2005
PubMed
まとめ

ソリッドステート照明は,古い技術よりも優れた効率と制御性を提供します. これらの高度な"スマート"光源は,多くの産業にわたる重要なエネルギー節約と多様なアプリケーションを約束します.

科学分野:

  • 光学とフォトニック
  • マテリアルサイエンス 材料科学
  • エネルギー技術 エネルギー技術

背景:

  • 光灯と光灯の照明技術には,固有の効率の限界があります.
  • 固体光源は,照明技術の重要な進歩を表しています.
  • 現在の照明ソリューションは,エネルギー効率の根本的な制約に直面しています.

研究 の 目的:

  • 固体光源の革命的な可能性を強調する.
  • 伝統的な方法よりも固体照明の利点を強調するために.
  • 先進的な照明技術の広範な適用性を探求する.

主な方法:

  • 照明技術の比較分析.
  • 固体電源の効率性と制御性についての議論.
  • 潜在的なアプリケーションの利点の探索.

主要な成果:

  • 固体光源は,従来の照明の効率を上回ります.
  • これらの光源は,光の特性 (スペクトル,色,調節) に対する前例のない制御を提供します.
  • 高効率はエネルギー節約と環境への恩恵をもたらします.

さらに関連する動画

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis
07:16

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis

Published on: September 27, 2019

関連する実験動画

Last Updated: Jul 5, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis
07:16

Light Spot-Based Assay for Analysis of Drosophila Larval Phototaxis

Published on: September 27, 2019

結論:

  • 固体照明は,数多くのアプリケーションに革命を起こしています.
  • 制御可能な"スマート"光源は,潜在的に大きな利点を提供します.
  • 将来の進歩は,固体照明のイノベーションによってのみ制限されます.