Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Precise Measurement of Differential Cross Sections of the Σ^{-}p→Λn Reaction in Momentum Range 470-650  MeV/c.

Physical review letters·2022
Same author

A case of resected retroperitoneal metachronous solitary metastasis from caecal cancer.

Annals of the Royal College of Surgeons of England·2020
Same author

Delayed lupus nephritis in the course of systemic lupus erythematosus is associated with a poorer treatment response: a multicentre, retrospective cohort study in Japan.

Lupus·2019
Same author

Experimental study of fast-neutron production and moderation for accelerator-based BNCT system.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2019
Same author

Association between excessive supraventricular ectopy and subclinical cerebrovascular disease: a population-based study.

European journal of neurology·2019
Same author

Effect of Donor Age on Graft Function and Pathologic Findings in Living Donor Transplantation.

Transplantation proceedings·2018

Video Experimental Relacionado

Updated: Jul 19, 2026

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
08:48

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

Published on: November 9, 2015

Emisión ultravioleta de una unión de diamante pn.

S Koizumi1, K Watanabe, M Hasegawa

  • 1Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan. KOIZUMI.satoshi@nims.go.jp

Science (New York, N.Y.)
|June 9, 2001
PubMed
Resumen

Los investigadores desarrollaron un diodo emisor de luz ultravioleta utilizando una unión de diamante pn. Este dispositivo emite una fuerte luz ultravioleta a 235 nanómetros, atribuida a la recombinación de excitones libres en el material de diamante.

Más Videos Relacionados

High Pressure Single Crystal Diffraction at PX^2
11:32

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

Videos de Experimentos Relacionados

Last Updated: Jul 19, 2026

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
08:48

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

Published on: November 9, 2015

High Pressure Single Crystal Diffraction at PX^2
11:32

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física del estado sólido Física del estado sólido
  • La optoelectrónica es la óptica electrónica.

Sus antecedentes:

  • El diamante es un material prometedor para dispositivos optoelectrónicos debido a su amplio intervalo de banda y conductividad térmica.
  • Los esfuerzos anteriores en los diodos emisores de luz basados en diamantes (LED) se han enfrentado a desafíos para lograr una emisión de luz eficiente.
  • El desarrollo de uniones PN confiables en diamante es crucial para la fabricación de LED.

Objetivo del estudio:

  • Para realizar un diodo emisor de luz ultravioleta (UV-LED) utilizando una unión de diamante pn.
  • Para investigar las propiedades de electroluminiscencia de una unión de diamante PN dopada con boro y fósforo.
  • Para confirmar el mecanismo de emisión responsable de la generación de luz UV.

Principales métodos:

  • Crecimiento epitaxial de capas de diamante tipo p dopadas con boro y de tipo n dopadas con fósforo en un único sustrato de diamante cristalino (111 superficies).
  • Fabricación de una unión pn mediante la integración de las capas de diamante tipo p y tipo n.
  • Caracterización de las propiedades eléctricas de la unión diamante pn.
  • Medición de los espectros de electroluminiscencia en condiciones de sesgo hacia adelante.

Principales resultados:

  • La unión PN de diamante fabricado demostró buenas características del diodo.
  • Se observó una fuerte emisión de luz ultravioleta a una longitud de onda de 235 nanómetros bajo un sesgo hacia adelante de aproximadamente 20 voltios.
  • La emisión observada se atribuyó a la recombinación de excitones libres dentro del material de diamante.

Conclusiones:

  • Se informa de la realización exitosa de un UV-LED basado en una unión de diamante pn.
  • Las uniones de diamante pn son viables para generar emisión de luz ultravioleta.
  • La recombinación de excitones libres se identifica como el mecanismo principal para la emisión de rayos UV en este LED de diamante, allanando el camino para dispositivos optoelectrónicos UV avanzados.