Prof. Jonathan J. Wierer
'%3e%3cpath%20d='M22.1642%2019.0924C21.7317%2018.068%2021.1041%2017.1375%2020.3163%2016.3527C19.5309%2015.5656%2018.6006%2014.9381%2017.5766%2014.5048C17.5674%2014.5002%2017.5582%2014.4979%2017.5491%2014.4933C18.9774%2013.4616%2019.9059%2011.7811%2019.9059%209.88504C19.9059%206.74408%2017.3611%204.19922%2014.2201%204.19922C11.0792%204.19922%208.53429%206.74408%208.53429%209.88504C8.53429%2011.7811%209.46282%2013.4616%2010.8912%2014.4956C10.882%2014.5002%2010.8728%2014.5025%2010.8636%2014.5071C9.83652%2014.9404%208.91487%2015.5617%208.1239%2016.355C7.33685%2017.1404%206.70933%2018.0707%206.276%2019.0947C5.85031%2020.0972%205.62072%2021.172%205.59967%2022.2609C5.59905%2022.2853%205.60335%2022.3097%205.61229%2022.3325C5.62123%2022.3553%205.63465%2022.376%205.65174%2022.3935C5.66883%2022.4111%205.68926%2022.425%205.71182%2022.4345C5.73437%2022.444%205.7586%2022.4489%205.78308%2022.4489H7.15868C7.25956%2022.4489%207.3398%2022.3686%207.3421%2022.2701C7.38795%2020.5001%208.09868%2018.8425%209.35506%2017.5861C10.655%2016.2862%2012.3814%2015.5709%2014.2201%2015.5709C16.0588%2015.5709%2017.7852%2016.2862%2019.0852%2017.5861C20.3415%2018.8425%2021.0523%2020.5001%2021.0981%2022.2701C21.1004%2022.3709%2021.1807%2022.4489%2021.2815%2022.4489H22.6571C22.6816%2022.4489%2022.7058%2022.444%2022.7284%2022.4345C22.751%2022.425%2022.7714%2022.4111%2022.7885%2022.3935C22.8056%2022.376%2022.819%2022.3553%2022.8279%2022.3325C22.8369%2022.3097%2022.8412%2022.2853%2022.8406%2022.2609C22.8176%2021.165%2022.5907%2020.0989%2022.1642%2019.0924ZM14.2201%2013.8284C13.1678%2013.8284%2012.1773%2013.418%2011.4322%2012.6729C10.6871%2011.9278%2010.2767%2010.9374%2010.2767%209.88504C10.2767%208.83271%2010.6871%207.84227%2011.4322%207.09715C12.1773%206.35204%2013.1678%205.94165%2014.2201%205.94165C15.2724%205.94165%2016.2629%206.35204%2017.008%207.09715C17.7531%207.84227%2018.1635%208.83271%2018.1635%209.88504C18.1635%2010.9374%2017.7531%2011.9278%2017.008%2012.6729C16.2629%2013.418%2015.2724%2013.8284%2014.2201%2013.8284Z'%20fill='%238590A2'/%3e%3c/g%3e%3c/svg%3e)
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Academic Career Length
32Years (1995-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications22 February 2009 in Nature Photonics
Journal Article
Jonathan J. WiererADAurelien David
Aurelien DavidMMMischa M. Megens
Mischa M. Megens
1 August 2013 in Laser & Photonics Reviews
Journal Article
Jonathan J. WiererJTJeffrey Y. Tsao
Jeffrey Y. Tsao
DSDmitry S. Sizov
Dmitry S. Sizov
28 May 2001 in Applied Physics Letters
Journal Article
Jonathan J. WiererDSD. A. Steigerwald
D. A. Steigerwald
MKMichael Krames
Michael KramesJOJ. J. O’sHea
J. J. O’sHea
MLM. J. Ludowise
M. J. Ludowise
SSS. A. Stockman
S. A. Stockman
+8
Data are presented on high-power AlGaInN flip-chip light-emitting diodes (FCLEDs). The FCLED is “flipped-over” or inverted compared to conventional AlGaInN light-emitting diodes (LEDs), and light is extracted through the transparent sapphire substrate. This avoids light absorption from the semitransparent metal contact in conventional epitaxial-up designs. The power FCLED has a large emitting area and an optimized contacting scheme allowing high current (200–1000 mA, operation with low forward voltages at 200 mA), and therefore higher power conversion (“wall-plug”) efficiencies. The improved extraction efficiency of the FCLED provides 1.6 times more light compared to top-emitting power LEDs and ten times more light than conventional small-area LEDs. FCLEDs in the blue wavelength regime peak) exhibit external quantum efficiency and wall-plug efficiency at 200 mA and with record light output powers of 400 mW at 1.0 A.
27 June 2014 in Advanced Optical Materials
Journal Article
JTJeffrey Y. Tsao
Jeffrey Y. TsaoMCMary H. Crawford
Mary H. Crawford
MCMichael E. Coltrin
Michael E. Coltrin
AFArthur J. Fischer
Arthur J. Fischer
DKDaniel D. Koleske
Daniel D. Koleske
RKRobert F. Karlicek
Robert F. Karlicek
+3
10 May 2004 in Applied Physics Letters
Journal Article
Jonathan J. WiererMKMichael Krames
Michael KramesJEJ. E. Epler
J. E. Epler
NGN. F. Gardner
N. F. Gardner
MCM. G. Craford
M. G. Craford
MSM. M. Sigalas
M. M. Sigalas
+2
Electrical operation of InGaN/GaN quantum-well heterostructure photonic crystal light-emitting diodes (PXLEDs) is demonstrated. A triangular lattice photonic crystal is formed by dry etching into the top GaN layer. Light absorption from the metal contact is minimized because the top GaN layers are engineered to provide lateral current spreading, allowing carrier recombination proximal to the photonic crystal yet displaced from the metal contact. The chosen lattice spacing for the photonic crystal causes Bragg scattering of guided modes out of the LED, increasing the extraction efficiency. The far-field radiation patterns of the PXLEDs are heavily modified and display increased radiance, up to ∼1.5 times brighter compared to similar LEDs without the photonic crystal.
1 July 2011 in Optics Express
Journal Article
ANA. Neumann
A. Neumann
Jonathan J. WiererWDW. Davis
W. DavisYOY. Ohno
Y. Ohno
SBS. R. J. Brueck
S. R. J. BrueckJTJ.Y. Tsao
J.Y. Tsao
Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers, however, has a much narrower spectral linewidth than light emitted from LEDs or phosphors. Therefore it is a common belief that white light produced by a set of lasers of different colors would not be of high enough quality for general illumination. We tested this belief experimentally, and found the opposite to be true. This result paves the way for the use of lasers in solid-state lighting.
About Me
Dr. Wierer is a professor in the Department of Electrical and Computer Engineering at North Carolina State University. His research interests include semiconductor device physics and materials science. Specifically, he focuses on electronic and optoelectronic devices based on III-nitride semiconductors. He earned a Ph.D. in Electrical Engineering from the University of Illinois, Champaign-Urbana, in 1999. His advisor was Nick Holonyak, Jr. Before joining NC State University, Dr. Wierer worked at Philips-Lumileds, Sandia National Laboratories, and Lehigh University. At Lumileds Advanced Laboratories, his research focused on novel III-nitride light-emitting diodes (LEDs). This included the development of the first high-power (1-Watt) flip-chip III-nitride LED and seminal work on III-nitride photonic crystal LEDs. At Sandia National Laboratories, his interests broadened to other III-nitride research areas, including solar cells, intersubband devices, layer intermixing, power electronic devices, ultraviolet LEDs, and nanowire LEDs. His groundbreaking proposal of laser diodes as an ultra-efficient light source for solid-state lighting is particularly notable. Dr. Wierer has authored or co-authored over 200 journal publications and conference presentations and holds 42 patents, predominantly related to III-nitride devices. He is a senior editor for the IEEE Photonics Technology Letters and the IEEE Journal of Quantum Electronics. He is an Optica Fellow and a senior member of the In