Navigation Links
Advance brings low-cost, bright LED lighting closer to reality
Date:7/17/2008

g ingredient in LEDs is a material called gallium nitride, which is used in the sapphire-based blue and green LEDs, including those in traffic signals. The material also is used in lasers in high-definition DVD players.

The sapphire-based technology, however, is currently too expensive for widespread domestic-lighting use, costing at least 20 times more than conventional incandescent and compact fluorescent light bulbs.

One reason for the high cost is that the sapphire-based LEDs require a separate mirrorlike collector to reflect light that ordinarily would be lost.

In the new silicon-based LED research, the Purdue engineers "metallized" the silicon substrate with a built-in reflective layer of zirconium nitride.

"When the LED emits light, some of it goes down and some goes up, and we want the light that goes down to bounce back up so we don't lose it," said Sands, the Mary Jo and Robert L. Kirk Director of the Birck Nanotechnology Center in Purdue's Discovery Park.

Ordinarily, zirconium nitride is unstable in the presence of silicon, meaning it undergoes a chemical reaction that changes its properties.

The Purdue researchers solved this problem by placing an insulating layer of aluminum nitride between the silicon substrate and the zirconium nitride.

"One of the main achievements in this work was placing a barrier on the silicon substrate to keep the zirconium nitride from reacting," Sands said.

Until the advance, engineers had been unable to produce an efficient LED created directly on a silicon substrate with a metallic reflective layer.

The Purdue team used a technique common in the electronics industry called reactive sputter deposition. Using the method, the researchers bombarded the metals zirconium and aluminum with positively charged ions of argon gas in a vacuum chamber. The argon ions caused metal atoms to be ejected, and a reaction with nitrogen in the chamber resulted in th
'/>"/>

Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
Source:Eurekalert  

Page: 1 2 3 4

Related biology technology :

1. China Biologic Products Honored with the Advanced Technology Certification for Foreign-Funded Enterprises
2. Cynosure Introduces Affirm CO2(TM) Workstation for Advanced Ablative Therapy
3. Advanced Life Sciences Announces Collaboration With UK Ministry of Defence on ALS-886
4. U.S. Genomics Awarded $9.1 Million Contract for Development of Advanced Biosensor by the U.S. Department of Homeland Security
5. Video: New, Advanced Therapy Program Helps People Who Stutter Acquire Fluent Speech
6. Will New Technological Advances Offer Fresh Capabilities for Commercialization and Enhance BTL Investments?
7. Ardea Biosciences Advances RDEA806 Into Phase 2a Proof-of-Concept Study for Gout
8. NorthPoint Domain and Boston Medical Center Partner to Apply Advanced Patient Engagement Instruments to Pioneering Cardiac Robotic Surgery Program
9. Advanced Life Sciences Added to Russell Microcap Index
10. Culligan's New Aqua-Cleer Advanced Drinking Water SystemProvides Clean, Quality Water Customized for Every Home
11. SACHEM Launches New Products for High Purity Advanced Ceramic Powders : Avanta AC™ Advanced Ceramics Solutions Offer Unique Advantages over Inorganic Bases in the Manufacture of Advanced Ceramic Nanoparticles
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Advance brings low-cost, bright LED lighting closer to reality
(Date:12/24/2014)... NEW YORK , Dec. 23, 2014 /PRNewswire/ ... study of mazindol in children with attention deficit/hyperactivity disorder ... December 2014 . The paper, titled ... attention deficit/hyperactivity disorder" ( Konofal et al, ... eCollection 2014 ) shows that mazindol might be ...
(Date:12/22/2014)... 2014 /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: REPCF) ... on the development of autologous cell therapies, announced today ... of Calgary in conjunction with co-authors from Kyoto University ... the company,s ongoing clinical research using dermal sheath cup ... The paper entitled " Hair Follicle Dermal ...
(Date:12/22/2014)... Dec. 22, 2014  ( www.competitivehealth.com ) — Competitive ... medical bill review and advocacy service, has signed an ... WellCard Savings discount health services marketplace. 63% ... more than they expected to pay. As part of ... costs, WellCard Savings is pleased to offer medical bill ...
(Date:12/22/2014)... December 22, 2014 Fertility Associates of ... Egg Bank USA , a network of more than ... this partnership, patients have fast access to a national ... fertilization, IVF . Fertility Associates of Memphis is the ... fertility treatment option. , Dr. William Kutteh , ...
Breaking Biology Technology:Redefining ADHD: A New Approach & A Shift of Paradigm in ADHD Therapeutics 2Redefining ADHD: A New Approach & A Shift of Paradigm in ADHD Therapeutics 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 2Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 4Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 5WellCard Savings Announces CoPatient Medical Bill Review Service for Members 2Fertility Associates of Memphis Announces Partnership with Donor Egg Bank USA 2Fertility Associates of Memphis Announces Partnership with Donor Egg Bank USA 3
... Small Tree Communications , a provider of enterprise ... for continued development of communications technology. , ,This funding, ... awarded through a competitive award process. It will enable ... the United States Army . , ,The request ...
... Wis . - Einstein Wireless , a Wisconsin-based ... alert subscribers via cell phone about natural disasters, terrorist ... first of its kind in the United States, will ... emergency alerts across most of Wisconsin, and notification equipment ...
... improperly apply its five percent sales tax to a software ... Wisconsin Supreme Court will decide that question after agreeing ... estimated $350 million at stake for businesses throughout Wisconsin, including ... of modified software, which unlike off-the-shelf software is not subject ...
Cached Biology Technology:
(Date:12/11/2014)... 2014 Research and Markets ... ( http://www.researchandmarkets.com/research/9ql3kr/biometrics_market ) has announced the addition of ... report to their offering. One ... adoption of multimodal biometric systems. Multimodal biometric systems ... for verification and identification purposes. This helps to ...
(Date:12/11/2014)... ST. PAUL, Minn. , Dec. 10, 2014 ... in wireless physiologic monitoring, has released a new ... changing needs of preclinical toxicology researchers. M series, ... to help toxicologists collect the best possible physiologic ... studies. Adding functional endpoints to toxicology ...
(Date:12/10/2014)... RALEIGH, N.C. , Dec. 9, 2014  Valencell, ... announced it is seeing a staggering demand from its ... demand, the Company revealed, is not solely coming from ... industries as well. "A wearable is only ... a result, accuracy is the ultimate driver in long-term ...
Breaking Biology News(10 mins):Biometrics Market in India 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2New telemetry implants expected to change how large animal toxicology studies are conducted 2Wearable Technology Products Demand Highly Accurate Biometric Technology 2
... press release is available in German . ... ecological impact of the extended cultivation of energy crops. ... assessing the impacts and comparing the effectiveness of strategies ... The extension of bioenergy leads to problems to biological ...
... larvae is central to fully understanding and modeling the pelagic ... time, a numerical study conducted by the University of Miami ... flow fields, creating a powerful tool that spells out how ... the reef after being out on the open ocean. ...
... Analysis of ancient mitochondrial DNA (mtDNA) has been used ... cultures during the time before Christopher Columbus sailed to ... access journal BMC Genetics has used more ... identify the family relationships and burial traditions of ancient ...
Cached Biology News:How the ecological risks of extended bioenergy production can be reduced 2How the ecological risks of extended bioenergy production can be reduced 3Fish larvae find the reef by orienting: The earlier the better 2Fish larvae find the reef by orienting: The earlier the better 3Forensic science used to determine who's who in pre-Columbian Peru 2
... GELase™ Agarose Gel-Digesting Preparation contains a unique ... simple, quantitative recovery of intact DNA and ... gels following electrophoresis in TAE, TBE, MOPS, ... digested directly in the TAE, TBE, MOPS, ...
... Gel-Digesting Preparation contains a unique β-agarose digesting ... recovery of intact DNA and RNA from ... electrophoresis in TAE, TBE, MOPS, or phosphate ... in the TAE, TBE, MOPS, and phosphate ...
... is causing shortages in your laboratory or ... can cause unwanted distractions, problems and delays. ... your hard work and endeavour! Bring us ... up and market it internationally. We work ...
... causing shortages in your laboratory or fellow ... unwanted distractions, problems and delays. ... hard work and endeavour! Bring us your ... market it internationally. We work under ISO ...
Biology Products: