Featured Research

from universities, journals, and other organizations

Powerful gallium nitride red light-emitting diodes made with europium and magnesium codoping

Date:
June 27, 2013
Source:
Toyohashi University of Technology
Summary:
Researchers in Japan have fabricated powerful red light-emitting diodes by codoping GaN with Eu and Mg.

Typical emission image of Eu doped GaN based LED.
Credit: Image courtesy of Toyohashi University of Technology

Toyohashi Tech researchers fabricate powerful red light-emitting diodes by codoping GaN with Eu and Mg.

Related Articles


Europium (Eu) doped nitride semiconductors show potential for realization of novel optical devices, such as a low threshold lasers and single photon emitters, due to their sharp line and high efficiency emission.

However, not all the Eu ions in semiconductor are incorporated in optically active sites that can be excited through the GaN host. Therefore, it is important to develop methods to selectively incorporate Eu ions in higher-efficiency optical sites.

Here, Hiroto Sekiguchi and colleagues at Toyohashi University of Technology and Hamamatsu Photonics Ltd have improved the emission intensity from Eu ions by Mg co-doping and fabricated red LEDs with Eu and Mg doped active layer grown by ammonia source MBE.

The optimal Mg co-doping selectively enhanced a specific emission site and contributed to a photoluminescence (PL) intensity increase of more than one order of magnitude. From the ratio of PL integrated intensity at 25 K to that at 300 K, the PL efficiency was determined to be as high as 77%. On the basis of these results, Eu doped GaN based LEDs were fabricated. Clear rectification characteristics with a turn-on voltage of 3.2 V were observed and a pure red emission was observed by the naked eye at room temperature. These results suggest that Eu and Mg doped GaN is expected to be utilized for realizing new nitride-based light-emitting devices.

Research highlight: http://www.tut.ac.jp/english/newsletter/research_highlights/research03.html#sec1


Story Source:

The above story is based on materials provided by Toyohashi University of Technology. Note: Materials may be edited for content and length.


Journal Reference:

  1. Hiroto Sekiguchi, Yasufumi Takagi, Tatsuki Otani, Ryota Matsumura, Hiroshi Okada, Akihiro Wakahara. Red-Light-Emitting Diodes with Site-Selective Eu-Doped GaN Active Layer. Japanese Journal of Applied Physics, 2013; 52: 08JH01 DOI: 10.7567/JJAP.52.08JH01

Cite This Page:

Toyohashi University of Technology. "Powerful gallium nitride red light-emitting diodes made with europium and magnesium codoping." ScienceDaily. ScienceDaily, 27 June 2013. <www.sciencedaily.com/releases/2013/06/130627124322.htm>.
Toyohashi University of Technology. (2013, June 27). Powerful gallium nitride red light-emitting diodes made with europium and magnesium codoping. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2013/06/130627124322.htm
Toyohashi University of Technology. "Powerful gallium nitride red light-emitting diodes made with europium and magnesium codoping." ScienceDaily. www.sciencedaily.com/releases/2013/06/130627124322.htm (accessed October 30, 2014).

Share This



More Matter & Energy News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Reuters - Innovations Video Online (Oct. 29, 2014) A Swedish amputee who became the first person to ever receive a brain controlled prosthetic arm is able to manipulate and handle delicate objects with an unprecedented level of dexterity. The device is connected directly to his bone, nerves and muscles, giving him the ability to control it with his thoughts. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Robots Get Funky on the Dance Floor

Robots Get Funky on the Dance Floor

AP (Oct. 29, 2014) Dancing, spinning and fighting robots are showing off their agility at "Robocomp" in Krakow. (Oct. 29) Video provided by AP
Powered by NewsLook.com
Saharan Solar Project to Power Europe

Saharan Solar Project to Power Europe

Reuters - Business Video Online (Oct. 29, 2014) A solar energy project in the Tunisian Sahara aims to generate enough clean energy by 2018 to power two million European homes. Matt Stock reports. Video provided by Reuters
Powered by NewsLook.com
Lowe's Testing Robot Sales Assistants in California Store

Lowe's Testing Robot Sales Assistants in California Store

Buzz60 (Oct. 29, 2014) Lowe’s is testing out what it’s describing as a robotic shopping assistant in one of its Orchard Supply Hardware Stores in California. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile: iPhone Android Web
    Follow: Facebook Twitter Google+
    Subscribe: RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins