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:8/28/2014)... Boston, MA (PRWEB) August 28, 2014 ... of wholesale construction materials, selected SoundConnect ... of their cloud based audio and web conferencing ... configured to support PrimeSource’s employees’ needs. SoundConnect ... technologies. , PrimeSource Building Products will be ...
(Date:8/27/2014)... Austin, TX (PRWEB) August 27, 2014 ... $6 million in Series B funding and secured Otter ... and investment capital will accelerate commercialization of GGI’s Agriplier™ ... multiple crop types. , “Since our first meeting, ... commitment to the biological product space,” said Alan Sobba, ...
(Date:8/27/2014)... 2014   MSC , a healthcare performance improvement ... the appointment of Mary Beth Loesch to ... of experience preparing companies for rapid growth and market ... President of Corporate Development and Healthcare. In that role, ... as well as corporate strategy and marketing. Previously, Loesch ...
(Date:8/27/2014)... DUBLIN , Aug. 27, 2014 ... of the "Global Lactic Acid  (Biodegradable Polymer, ... - Trends & Forecasts to 2019" report ... the simplest hydroxyl-carboxylic acid with an asymmetrical carbon ... in the biodegradable polymer, food and beverage, personal ...
Breaking Biology Technology:PrimeSource Chooses SoundConnect as Collaboration Provider 2Green & Grow Inc. Secures $6M Series B Funding from Otter Capital 2Green & Grow Inc. Secures $6M Series B Funding from Otter Capital 3MSC names Mary Beth Loesch President and CEO 2Global Lactic Acid (Biodegradable Polymer, Food & Beverage, Personal Care & Pharmaceutical) Market - Trends & Forecasts to 2019 2
... Mass. and SAN DIEGO, Calif., April 16 ,Boston ... Inc. (Nasdaq: CRYO ),today announced the signing ... will pay a cash purchase price of $1.35 ... acquisition follows a,development agreement, in place since June ...
... the 99th Annual Meeting of the American ... Association for Cancer Research (AACR) ... Inc.,("Lorus") (TSX: LOR; AMEX: LRP), a biopharmaceutical company specializing,in ... for the management of cancer, today announced,presentations of further ...
... Serono and its US,affiliate EMD Serono, Inc., both ... planned expansion of EMD Serono,s US presence with ... facility northwest,of Boston, Massachusetts. The company anticipates that ... in Massachusetts., The investment will support the ...
Cached Biology Technology:Boston Scientific and CryoCor Announce Signing of Definitive Merger Agreement 2Boston Scientific and CryoCor Announce Signing of Definitive Merger Agreement 3Boston Scientific and CryoCor Announce Signing of Definitive Merger Agreement 4Boston Scientific and CryoCor Announce Signing of Definitive Merger Agreement 5Boston Scientific and CryoCor Announce Signing of Definitive Merger Agreement 6Lorus Therapeutics presents new findings for the anticancer drugs LOR-253 and LOR-2040 2Lorus Therapeutics presents new findings for the anticancer drugs LOR-253 and LOR-2040 3Lorus Therapeutics presents new findings for the anticancer drugs LOR-253 and LOR-2040 4EMD Serono Announces Planned Investment of $50 Million in Research Center in Massachusetts 2EMD Serono Announces Planned Investment of $50 Million in Research Center in Massachusetts 3EMD Serono Announces Planned Investment of $50 Million in Research Center in Massachusetts 4
(Date:8/28/2014)... FASEB MARC (Maximizing Access to Research Careers) Program ... American College of Sports Medicine,s Conference on Integrative ... Miami, Florida. These awards are meant to ... scientists from underrepresented groups into the mainstream of ... participation of young scientists at the American College ...
(Date:8/28/2014)... measuring and imaging how quickly blood flows in the ... drug abuse affects the brain, which may aid in ... better treatment options for recovering drug addicts. The new ... Brook University in New York, USA and the U.S. ... Optical Society,s (OSA) open-access journal Biomedical Optics ...
(Date:8/28/2014)... 25 million kilometres of new roads will be built ... into Earth,s last wildernesses, where they bring an influx ... Now, an ambitious study has created a ,global roadmap, ... to balance the competing demands of development and environmental ... layer that estimates that natural importance of ecosystems and ...
Breaking Biology News(10 mins):This is your brain's blood vessels on drugs 2This is your brain's blood vessels on drugs 3Study shows where on the planet new roads should and should not go 2Study shows where on the planet new roads should and should not go 3
... Livermore National Laboratory physicist and his colleagues have found ... used in physics to help solve problems in biology. ... modeling to shed light on something known as epigenetic ... memory of some variable condition, such as quality of ...
... had been reckoned until today to be around 2,000 million ... fish, in other words, ones found at depths of between ... international team*, in which AZTI-Tecnalia researchers are participating and which ... has discovered that its abundance could be at least 10 ...
... by excessive and systemic reaction of the entire body ... The number of deaths by septic shock in intensive ... despite numerous large scale clinical trials. Scientists of VIB ... mouse study that a potential novel treatment for sepsis ...
Cached Biology News:New application of physics tools used in biology 2Researchers at UGent and VIB, discovered potential novel treatment against septic shock 2
...
cysteine and glycine-rich protein 2,...
... Antitumour agent and DNA-topoisomersae II inhibitor (IC50 = ... C 29 H 32 O 13 ... Store at: RT ... Solubility: Soluble to 100 ...
HSPBP1 Antibody...
Biology Products: