Navigation Links
Zinc oxide microwires improve the performance of light-emitting diodes
Date:10/31/2011

sed the local piezoelectric potential to tune the charge transport at the p-n junction.

The effect was to increase the rate at which electrons and holes recombined to generate photons, enhancing the external efficiency of the device through improved light emission and higher injection current. "The effect of the piezopotential on the transport behavior of charge carriers is significant due to its modification of the band structure at the junction," Wang explained.

The zinc oxide wires form the "n" component of a p-n junction, with the gallium nitride thin film providing the "p" component. Free carriers were trapped at this interface region in a channel created by the piezoelectric charge formed by compressing the wires.

Traditional LED designs use structures such as quantum wells to trap electrons and holes, which must remain close together long enough to recombine. The longer that electrons and holes can be retained in proximity to one another, the higher the efficiency of the LED device will ultimately be.

The devices produced by the Georgia Tech team increased their emission intensity by a factor of 17 and boosted injection current by a factor of four when compressive strain of 0.093 percent was applied to the zinc oxide wire. That improved conversion efficiency by as much as a factor of 4.25.

The LEDs fabricated by the research team produced emissions at ultraviolet frequencies (about 390 nanometers), but Wang believes the frequencies can be extended into the visible light range for a variety of optoelectronic devices. "These devices are important for today's focus on green and renewable energy technology," he said.

In the experimental devices, a single zinc oxide micro/nanowire LED was fabricated by manipulating a wire on a trenched substrate. A magnesium-doped gallium nitride film was grown epitaxially on a sapphire substrate by metalorganic chemical vapor deposition, and was used to form a p-n junc
'/>"/>

Contact: John Toon
jtoon@gatech.edu
404-894-6986
Georgia Institute of Technology Research News
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Edible carbon dioxide sponge
2. GeNO LLC Receives Federal Grant To Advance Studies of Inhaled Nitric Oxide Product for the Treatment of Chronic Pulmonary Diseases
3. The heat is on for sodium-manganese oxide rechargeable batteries
4. Researchers find replacement for rare material indium tin oxide
5. Blocking carbon dioxide fixation in bacteria increases biofuel production
6. Reportlinker Adds Propylene Oxide: 2010 World Market Outlook and Forecast
7. Earthshaking possibilities may limit underground storage of carbon dioxide
8. GeNO LLC Initiates Phase 2 Trial For Nitric Oxide Delivery System
9. New nano techniques integrate electron gas-producing oxides with silicon
10. Cardium Gains Exclusive Access to Novel Polymer-Based Nitric Oxide Technology for Expansion of Wound Healing Product Portfolio
11. Researchers create new class of piezoelectric logic devices using zinc oxide nanowires
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Zinc oxide microwires improve the performance of light-emitting diodes
(Date:1/15/2014)... and SAN JOSE, California , January ... company developing antibody-drug conjugates for cancer, today announced the appointment ... Directors. Dr Reynolds has over 20 years, development experience gained ... at Seattle Genetics. "I am delighted to welcome ...
(Date:1/15/2014)... Two champions of science, technology, engineering, and mathematics ... competition for middle and high school students designed to ... The competition presents students with real-world problems experienced by ... and Sciences is a program administered by the ...
(Date:1/15/2014)... 15, 2014 AudioNotch is the internet's ... for the treatment of tinnitus. Patients listen to sound ... over a period of weeks to months, their tinnitus volume ... two forms: Notched Music and Notched White Noise. Now, AudioNotch ...
(Date:1/14/2014)... WASHINGTON , Jan. 14, 2014  3D Communications, a leading provider ... scientific, regulatory, business, and media events in the United ... its former associate Virginia Cox , JD, is returning to ... Virginia Cox re-joins 3D after more than two years ...
Breaking Biology Technology:Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 2Oxford BioTherapeutics Appoints Thomas C Reynolds MD, PhD to its Board of Directors 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5Former FDA Associate Commissioner Returns To 3D Communications 2
... RVX, ORLANDO, FL, Nov. 5 /PRNewswire-FirstCall/ ... announce today key scientific data,was presented in ... of,RVX-208, at the American Heart Association Scientific ... RVX-208 Increases,Serum Levels of ApoA-I and Improves ...
... -,- 3Q07 Net Income Increased 58% Compared to 3Q06 to $11.9 Million, or ... ... Provides Financial Outlook for 2007 and 2008 -, NEW YORK, Nov. 5 ... of,plant-based pharmaceutical and nutraceutical products, today announced,financial results for the third quarter of ...
... Third ... Compared to Third Quarter 2006 FFO Per Share (Diluted) of ... $1.32 - Third Quarter 2007 Total Revenues up 23%, FFO Available to Common ... Stockholders up 21% - Third Quarter 2007 Earnings Per Share (Diluted) of $0.68, ...
Cached Biology Technology:Reverse Cholesterol Transport by RVX-208 a Small Molecule for ApoA-I Production Increase Presented at American Heart Association Scientific Meeting 2Reverse Cholesterol Transport by RVX-208 a Small Molecule for ApoA-I Production Increase Presented at American Heart Association Scientific Meeting 3American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 2American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 3American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 4American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 5American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 6American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 7American Oriental Bioengineering Reports Third Quarter 2007 Financial Results 8Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 2Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 3Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 4Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 5Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 6Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 7Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 8Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 9Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 10Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 11Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 12Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 13Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 14Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 15Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 16Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 17Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 18Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 19Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 20Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 21Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 22Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 23Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 24Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 25Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 26Alexandria Real Estate Equities, Inc. Reports Third Quarter 2007 Results 27
(Date:4/23/2014)... Angeles, London (April 23, 2014). "I think one can argue ... pathwayas well as doing everything else that we canthen we ... Tom Wigley, one of the world,s foremost climate researchers, in ... , published by SAGE. Refusing to take significant action on ... eventually be needed to address the problem, Wigley explains in ...
(Date:4/22/2014)... Yale researchers will lead a five-year, $3 million study ... is affecting the transport of dissolved organic matter (DOM) ... could alter the chemical composition and water quality of ... from the National Science Foundation,s MacroSystems Biology program, researchers ... watershed, which begins in Canada and runs through five ...
(Date:4/22/2014)... 22, 2014) Biotechnology scientists must be aware of ... and licensing guidelines, according to a new paper from ... in the current issue of the journal Regenerative ... 2013 U.S. Supreme Court ruling in the case Association ... occurring genes are unpatentable. The court case and rulings ...
Breaking Biology News(10 mins):Is nuclear power the only way to avoid geoengineering? 2Connecticut River watershed study will assess impacts of extreme rain events 2Connecticut River watershed study will assess impacts of extreme rain events 3New patenting guidelines are needed for biotechnology 2New patenting guidelines are needed for biotechnology 3
... might tell potential suitors, "I like the way you ... worms send their valentines via signals known as pheromones, ... to a study published Wednesday (July 23) in the ... University of Florida, Cornell University, the California Institute of ...
... July 23, 2008. A fire is currently burning through a ... 2 years ago. Managers used data and analysis from the ... implementation of treatments near where the Cold Springs fire is ... of the Cascade Range in Washington, and covers about 15,000 ...
... manure into a domestic renewable fuel source could generate ... of North America,s entire consumption needs and lead to ... to US research published today, Thursday, 24 July, in ... The journal paper, ,Cow Power: The Energy and ...
Cached Biology News:Mate or hibernate? That's the question worm pheromones answer 2Mate or hibernate? That's the question worm pheromones answer 3Landscape study may offer solutions for fire managers 2Cow power could generate electricity for millions 2