Info
Info
News Article

Brightening And Strengthening GaN LEDs

Scientists have reported that adding phosphonic groups increases luminescence and enhances the stability of the gallium nitride based devices
Researchers from North Carolina State University have developed a new processing technique that makes LEDs brighter and more resilient by coating GaN with a layer of phosphorus-derived acid.

“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."



By coating polar GaN with phosphonic groups, the researchers increased luminescence without increasing energy input. (Image: Stewart Wilkins)

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 work has been described in the paper, “In Situ Chemical Functionalization of Gallium Nitride with Phosphonic Acid Derivatives during Etching," by Stewart J. Wilkins et al in Langmuir, 2014, 30 (8), pp 2038–2046.  DOI: 10.1021/la404511b

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

 



AngelTech Live III: Join us on 12 April 2021!

AngelTech Live III will be broadcast on 12 April 2021, 10am BST, rebroadcast on 14 April (10am CTT) and 16 April (10am PST) and will feature online versions of the market-leading physical events: CS International and PIC International PLUS a brand new Silicon Semiconductor International Track!

Thanks to the great diversity of the semiconductor industry, we are always chasing new markets and developing a range of exciting technologies.

2021 is no different. Over the last few months interest in deep-UV LEDs has rocketed, due to its capability to disinfect and sanitise areas and combat Covid-19. We shall consider a roadmap for this device, along with technologies for boosting its output.

We shall also look at microLEDs, a display with many wonderful attributes, identifying processes for handling the mass transfer of tiny emitters that hold the key to commercialisation of this technology.

We shall also discuss electrification of transportation, underpinned by wide bandgap power electronics and supported by blue lasers that are ideal for processing copper.

Additional areas we will cover include the development of GaN ICs, to improve the reach of power electronics; the great strides that have been made with gallium oxide; and a look at new materials, such as cubic GaN and AlScN.

Having attracted 1500 delegates over the last 2 online summits, the 3rd event promises to be even bigger and better – with 3 interactive sessions over 1 day and will once again prove to be a key event across the semiconductor and photonic integrated circuits calendar.

So make sure you sign up today and discover the latest cutting edge developments across the compound semiconductor and integrated photonics value chain.

REGISTER FOR FREE

VIEW SESSIONS

Info
×
Search the news archive

To close this popup you can press escape or click the close icon.
×
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
 
X
Info
X
Info
{taasPodcastNotification}
Live Event