Featured Research

from universities, journals, and other organizations

New technique makes LEDs brighter, more resilient

Date:
March 19, 2014
Source:
North Carolina State University
Summary:
Researchers have developed a new processing technique that makes light emitting diodes brighter and more resilient by coating the semiconductor material gallium nitride with a layer of phosphorus-derived acid.

By coating polar gallium nitride with phosphonic groups, the researchers increased luminescence without increasing energy input.
Credit: Stewart Wilkins

Researchers from North Carolina State University have developed a new processing technique that makes light emitting diodes (LEDs) brighter and more resilient by coating the semiconductor material gallium nitride (GaN) with a layer of phosphorus-derived acid.

Related Articles


"By coating polar GaN with a self-assembling layer of phosphonic groups, we were able to increase luminescence without increasing energy input," says Stewart Wilkins, a Ph.D. student at NC State and lead author of a paper describing the work. "The phosphonic groups also improve stability, making the GaN less likely to degrade in solution.

"Making the GaN more stable is important," Wilkins adds, "because that makes it more viable for use in biomedical applications, such as implantable sensors."

The researchers started with polar GaN, composed of alternating layers of gallium and nitrogen. To increase luminescence, they etched the surface of the material with phosphoric acid. At the same time, they added phosphonic groups -- organic molecules containing phosphorus -- that self-assembled into a monolayer on the surface of the material. This layer further increased luminescence and improved the stability of the GaN by making it less likely to react chemically with its environment.

The paper, "In Situ Chemical Functionalization of Gallium Nitride with Phosphonic Acid Derivatives during Etching," is published online in the journal Langmuir. Senior author of the paper is Dr. Albena Ivanisevic, an associate professor of materials science and engineering at NC State and associate professor of the joint biomedical engineering program at NC State and the University of North Carolina at Chapel Hill. The paper was co-authored by Dr. Consuelo Arellano, a research associate professor of statistics at NC State; Dr. Tania Paskova, a research professor of electrical and computer engineering at NC State; and Michelle Greenough, an undergraduate at Wagner College.

The research was supported in part by the National Science Foundation under grant EEC 1156762.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Stewart J. Wilkins, Michelle Greenough, Consuelo Arellano, Tania Paskova, Albena Ivanisevic. In Situ Chemical Functionalization of Gallium Nitride with Phosphonic Acid Derivatives during Etching. Langmuir, 2014; 30 (8): 2038 DOI: 10.1021/la404511b

Cite This Page:

North Carolina State University. "New technique makes LEDs brighter, more resilient." ScienceDaily. ScienceDaily, 19 March 2014. <www.sciencedaily.com/releases/2014/03/140319114853.htm>.
North Carolina State University. (2014, March 19). New technique makes LEDs brighter, more resilient. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2014/03/140319114853.htm
North Carolina State University. "New technique makes LEDs brighter, more resilient." ScienceDaily. www.sciencedaily.com/releases/2014/03/140319114853.htm (accessed December 18, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Thursday, December 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Printed Cookies Just in Time for Christmas

3D Printed Cookies Just in Time for Christmas

Reuters - Innovations Video Online (Dec. 18, 2014) A tech company in Spain have combined technology with cuisine to develop the 'Foodini', a 3D printer designed to print the perfect cookie for Santa. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
How Sony Hopes To Make Any Glasses 'Smart'

How Sony Hopes To Make Any Glasses 'Smart'

Newsy (Dec. 17, 2014) Sony's glasses module attaches to the temples of various eye- and sunglasses to add a display and wireless connectivity. Video provided by Newsy
Powered by NewsLook.com
Los Angeles Police To Receive 7,000 Body Cameras

Los Angeles Police To Receive 7,000 Body Cameras

Newsy (Dec. 17, 2014) Los Angeles Mayor Eric Garcetti announced the cameras will be distributed starting Jan. 1. Video provided by Newsy
Powered by NewsLook.com
Jaguar Unveils 360 Virtual Windshield Making Car Pillars Appear Transparent

Jaguar Unveils 360 Virtual Windshield Making Car Pillars Appear Transparent

Buzz60 (Dec. 17, 2014) Jaguar unveils a virtual 360 degree windshield that may be the most futuristic automotive development yet. 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