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35 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
The Clifton Record (Clifton, Tex.), Vol. 106, No. 94, Ed. 1 Friday, November 23, 2001
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2001
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Calibration Monitor for Dark Energy Experiments
The goal of this program was to design, build, test, and characterize a flight qualified calibration source and monitor for a Dark Energy related experiment: ACCESS - 'Absolute Color Calibration Experiment for Standard Stars'. This calibration source, the On-board Calibration Monitor (OCM), is a key component of our ACCESS spectrophotometric calibration program. The OCM will be flown as part of the ACCESS sub-orbital rocket payload in addition to monitoring instrument sensitivity on the ground. The objective of the OCM is to minimize systematic errors associated with any potential changes in the ACCESS instrument sensitivity. Importantly, the OCM will be used to monitor instrument sensitivity immediately after astronomical observations while the instrument payload is parachuting to the ground. Through monitoring, we can detect, track, characterize, and thus correct for any changes in instrument senstivity over the proposed 5-year duration of the assembled and calibrated instrument.
Date:
November 23, 2009
Creator:
Kaiser, M. E.
Object Type:
Report
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 92, No. 47, Ed. 1 Thursday, November 23, 2000
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
November 23, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Eagle (Tulsa, Okla.), Vol. 79, No. 46, Ed. 1 Thursday, November 23, 2000
Weekly newspaper from Tulsa, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 23, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Cherokeean Herald (Rusk, Tex.), Vol. 156, No. 40, Ed. 1 Wednesday, November 23, 2005
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 23, 2005
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Throckmorton Tribune (Throckmorton, Tex.), Vol. 115, No. 9, Ed. 1 Thursday, November 23, 2000
Weekly newspaper from Throckmorton, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2000
Creator:
Mayes, Cecil
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 100, No. 14, Ed. 1 Sunday, November 23, 2008
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 23, 2008
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 151, No. 40, Ed. 1 Thursday, November 23, 2000
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 23, 2000
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 26, No. 68, Ed. 1 Sunday, November 23, 2003
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2003
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Stamford American (Stamford, Tex.), Vol. 84, No. 34, Ed. 1 Wednesday, November 23, 2005
Weekly newspaper from Stamford, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2005
Creator:
Reeves, Laura
Object Type:
Newspaper
System:
The Portal to Texas History
Stamford American (Stamford, Tex.), Vol. 85, No. 33, Ed. 1 Thursday, November 23, 2006
Weekly newspaper from Stamford, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2006
Creator:
Wilson, Erika
Object Type:
Newspaper
System:
The Portal to Texas History
Hudspeth County Herald and Dell Valley Review (Dell City, Tex.), Vol. 52, No. 8, Ed. 1 Friday, November 23, 2007
Weekly newspaper from Dell City, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2007
Creator:
Morrell, Donna
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, November 23, 2009
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 23, 2009
Creator:
Pittman, Jerry & Wray, Kelly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Harper News (Harper, Tex.), Vol. 5, No. 2, Ed. 1 Friday, November 23, 2007
Biweekly newspaper from Harper, Texas that includes community news along with advertising.
Date:
November 23, 2007
Creator:
Stevens, Martha
Object Type:
Newspaper
System:
The Portal to Texas History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 98, No. 34, Ed. 1 Thursday, November 23, 2000
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 23, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Tulia Herald (Tulia, Tex.), Vol. 98, No. 47, Ed. 1 Thursday, November 23, 2006
Weekly newspaper from Tulia, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 131, No. 26, Ed. 1 Thursday, November 23, 2006
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
November 23, 2006
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Panola Watchman (Carthage, Tex.), Vol. 136, No. 94, Ed. 1 Sunday, November 23, 2008
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 116, No. 21, Ed. 1 Thursday, November 23, 2006
Weekly newspaper from De Leon, Texas that includes local, state, and national news along with advertising.
Date:
November 23, 2006
Creator:
Kestner, Laura
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Fort Worth, Tex.), Vol. 30, No. 228, Ed. 1 Thursday, November 23, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
November 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 501, Ed. 1 Thursday, November 23, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
November 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Arlington-Grand Prairie, Tex.), Vol. 30, No. 227, Ed. 1 Thursday, November 23, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
November 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Today Cedar Hill (Duncanville, Tex.), Vol. 41, No. 32, Ed. 1 Thursday, November 23, 2006
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
November 23, 2006
Creator:
Gooch, Robin
Object Type:
Newspaper
System:
The Portal to Texas History