• HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
  • CONTACT US
Saturday, September 30, 2023
BIOENGINEER.ORG
No Result
View All Result
  • Login
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
  • CONTACT US
  • HOME
  • NEWS
  • EXPLORE
    • CAREER
      • Companies
      • Jobs
        • Lecturer
        • PhD Studentship
        • Postdoc
        • Research Assistant
    • EVENTS
    • iGEM
      • News
      • Team
    • PHOTOS
    • VIDEO
    • WIKI
  • BLOG
  • COMMUNITY
    • FACEBOOK
    • INSTAGRAM
    • TWITTER
  • CONTACT US
No Result
View All Result
Bioengineer.org
No Result
View All Result
Home NEWS Science News

Optoelectronic devices that emit warm and cool white light

Bioengineer by Bioengineer
December 21, 2020
in Science News
Reading Time: 2 mins read
0
Share on FacebookShare on TwitterShare on LinkedinShare on RedditShare on Telegram

IMAGE

Credit: © 2020 KAUST

The advantages of light-emitting diodes (LEDs), such as their tiny size, low cost and excellent power efficiency, mean they are found everywhere in modern life. A KAUST team has recently developed a way of producing a white-light LED that overcomes some critical challenges.

Blinking away on almost every modern electronic device, LEDs transmit messages in their own distinct shade of red, green or blue. The coloration of an LED comes from a semiconductor inside that emits over a narrow spectrum of optical wavelengths. The inability of LEDs to emit across a wider spectrum restricts their use in lighting applications — emitting a wider spectrum is necessary to generate white light — or for displays that require a wide palette of different colors.

One approach to fabricate white-light LEDs is to combine devices of different materials, where each material emits a different color. The emission of red, blue and green from the different materials can be combined to create white light, but this increases the complexity and cost of manufacture of LEDs. Alternatively, a single semiconductor can be used by mixing in a phosphor that absorbs some of the light emitted by the semiconductor and then re-emits it as a different color. However, phosphor degrades over time, limiting the useful lifetime of these devices.

Daisuke Iida and Kazuhiro Ohkawa’s team have devised a way to build phosphor-free monolithic white-light LEDs using the semiconductor indium gallium nitride.

The emission color of indium gallium nitride depends on the relative content of the indium and gallium atoms. For example, gallium nitride emits ultraviolet light, but adding indium shifts the emission across the visible spectrum and into the infrared. The emission can be controlled further by sandwiching very thin layers of indium gallium nitride with one composition between two layers of different composition, creating so-called quantum wells.

“What is unique about our devices is that we use material defects, or V-pit structures, to enhance the injection of a current into the semiconductor,” says Iida. The LEDs designed by the KAUST team included both blue-light emitting quantum wells with a 20 percent indium content and 34 percent indium red quantum wells. Combined, this monolithic LED emits light across the entire visible spectrum. By controlling the current passing through the device, the team could change the emission from a warm white to a natural white and through to a cool white.

“The next step is to improve the emission efficacy of the red emission component,” says Iida. “The red emission is a key factor of the high color-rendering LEDs with the natural white emission.”

###

Media Contact
Michael Cusack
[email protected]

Original Source

https://discovery.kaust.edu.sa/en/article/1068/optoelectronic-devices-that-emit-warm-and-cool-white-light

Related Journal Article

http://dx.doi.org/10.1063/5.0026017

Tags: Chemistry/Physics/Materials SciencesElectrical Engineering/ElectronicsMaterialsOpticsSuperconductors/Semiconductors
Share12Tweet8Share2ShareShareShare2

Related Posts

New polyion complex for CAR T-cell therapy.

Hairy polymer balls help get genetic blueprints inside T-cells for blood cancer therapy

September 30, 2023
Irritible Bowel Syndrome

New study will examine irritable bowel syndrome as long COVID symptom

September 29, 2023

True progression or pseudoprogression in glioblastoma patients?

September 29, 2023

Neural activity associated with motor commands changes depending on context

September 29, 2023
Please login to join discussion

POPULAR NEWS

  • blank

    Microbe Computers

    59 shares
    Share 24 Tweet 15
  • A pioneering study from Politecnico di Milano sheds light on one of the still poorly understood aspects of cancer

    35 shares
    Share 14 Tweet 9
  • Fossil spines reveal deep sea’s past

    34 shares
    Share 14 Tweet 9
  • Scientists go ‘back to the future,’ create flies with ancient genes to study evolution

    75 shares
    Share 30 Tweet 19

About

We bring you the latest biotechnology news from best research centers and universities around the world. Check our website.

Follow us

Recent News

Hairy polymer balls help get genetic blueprints inside T-cells for blood cancer therapy

New study will examine irritable bowel syndrome as long COVID symptom

True progression or pseudoprogression in glioblastoma patients?

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 56 other subscribers
  • Contact Us

Bioengineer.org © Copyright 2023 All Rights Reserved.

No Result
View All Result
  • Homepages
    • Home Page 1
    • Home Page 2
  • News
  • National
  • Business
  • Health
  • Lifestyle
  • Science

Bioengineer.org © Copyright 2023 All Rights Reserved.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In