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36 Matching Results
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Local indium segregation and band structure in high efficiencygreen light emitting InGaN/GaN diodes
GaN/InGaN light emitting diodes (LEDs) are commercialized for lighting applications because of the cost efficient way that they produce light of high brightness. Nevertheless, there is significant room for improving their external emission efficiency from typical values below 10 percent to more than 50 percent, which are obtainable by use of other materials systems that, however, do not cover the visible spectrum. In particular, green-light emitting diodes fall short in this respect, which is troublesome since the human eye is most sensitive in this spectral range. In this letter advanced electron microscopy is used to characterize indium segregation in InGaN quantum wells of high-brightness, green LEDs (with external quantum efficiency as high as 15 percent at 75 A/cm2). Our investigations reveal the presence of 1-3 nm wide indium rich clusters in these devices with indium concentrations as large as 0.30-0.40 that narrow the band gap locally to energies as small as 2.65 eV.
Date:
November 23, 2004
Creator:
Jinschek, Joerg R.; Erni, Rolf; Gardner, Nathan F.; Kim, AndrewY. & Kisielowski, Christian
Object Type:
Article
System:
The UNT Digital Library
New Class of CW High-Power Diode-Pumped Alkali Lasers (DPALs)
The new class of diode-pumped alkali vapor lasers (DPALs) offers high efficiency cw laser radiation at near-infrared wavelengths: cesium 895 nm, rubidium 795 nm, and potassium 770 nm. The working physical principles of DPALs will be presented. Initial 795 nm Rb and 895 nm Cs laser experiments performed using a titanium sapphire laser as a surrogate pump source demonstrated DPAL slope power conversion efficiencies in the 50-70% range, in excellent agreement with device models utilizing only literature spectroscopic and kinetic data. Using these benchmarked models for Rb and Cs, optimized DPALs with optical-optical efficiencies >60%, and electrical efficiencies of 25-30% are projected. DPAL device architectures for near-diffraction-limited power scaling into the high kilowatt power regime from a single aperture will be described. DPAL wavelengths of operation offer ideal matches to silicon and gallium arsenide based photovoltaic power conversion cells for efficient power beaming.
Date:
March 23, 2004
Creator:
Krupke, W F; Beach, R J; Kanz, V K; Payne, S A & Early, J T
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 109, No. 7, Ed. 1 Friday, January 23, 2004
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 109, No. 39, Ed. 1 Friday, July 23, 2004
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
July 23, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 109, No. 26, Ed. 1 Friday, April 23, 2004
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 23, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
A step towards a computing grid for the LHC experiments: ATLAS Data Challenge 1
The ATLAS Collaboration at CERN is preparing for the data taking and analysis at the LHC that will start in 2007. Therefore, a series of Data Challenges was started in 2002 whose goals are the validation of the Computing Model, of the complete software suite, of the data model, and to ensure the correctness of the technical choices to be made. A major feature of the first Data Challenge was the preparation and the deployment of the software required for the production of large event samples as a worldwide-distributed activity. It should be noted that it was not an option to ''run everything at CERN'' even if we had wanted to; the resources were not available at CERN to carry out the production on a reasonable time-scale. The great challenge of organizing and then carrying out this large-scale production at a significant number of sites around the world had the refore to be faced. However, the benefits of this are manifold: apart from realizing the required computing resources, this exercise created worldwide momentum for ATLAS computing as a whole. This report describes in detail the main steps carried out in DC1 and what has been learned from them as a …
Date:
April 23, 2004
Creator:
Sturrock, R.; Bischof, R.; Epp, B.; Ghete, V. M.; Kuhn, D.; Mello, A. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 34, No. 39, Ed. 1 Thursday, September 23, 2004
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
September 23, 2004
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 95, No. 52, Ed. 1 Thursday, December 23, 2004
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
December 23, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 93, No. 1, Ed. 1, Monday, August 23, 2004
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
August 23, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Tuesday, March 23, 2004
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
March 23, 2004
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Sealy News (Sealy, Tex.), Vol. 117, No. 24, Ed. 1 Tuesday, March 23, 2004
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
March 23, 2004
Creator:
Griffin, Joanie & Horecka, Bobby
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 92, No. 50, Ed. 1, Friday, April 23, 2004
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
April 23, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 87, No. 148, Ed. 1 Friday, April 23, 2004
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 23, 2004
Creator:
King, Christopher R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 102, No. 39, Ed. 1 Thursday, December 23, 2004
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 23, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Friday, January 23, 2004
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2004
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Jewish Post (Fort Worth, Tex.), Vol. 58, No. 39, Ed. 1 Thursday, September 23, 2004
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
September 23, 2004
Creator:
Wisch, Rene & Wisch-Ray, Sharon
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Eagle (Tulsa, Okla.), Vol. 83, No. 38, Ed. 1 Thursday, September 23, 2004
Weekly newspaper from Tulsa, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 23, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Hudspeth County Herald and Dell Valley Review (Dell City, Tex.), Vol. 48, No. 47, Ed. 1 Friday, July 23, 2004
Weekly newspaper from Dell City, Texas that includes local, state, and national news along with advertising.
Date:
July 23, 2004
Creator:
Lynch, Mary Louise
Object Type:
Newspaper
System:
The Portal to Texas History
Hudspeth County Herald and Dell Valley Review (Dell City, Tex.), Vol. 48, No. 34, Ed. 1 Friday, April 23, 2004
Weekly newspaper from Dell City, Texas that includes local, state, and national news along with advertising.
Date:
April 23, 2004
Creator:
Lynch, Mary Louise
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 92, No. 30, Ed. 1, Friday, January 23, 2004
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
January 23, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 12, Ed. 1 Wednesday, June 23, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
June 23, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, February 23, 2004
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 23, 2004
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Archer County News (Archer City, Tex.), No. 39, Ed. 1 Thursday, September 23, 2004
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
September 23, 2004
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Friday, July 23, 2004
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 23, 2004
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History