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solid state lighting & energy center

2013 Current | 2012 Archives | 2011 Archives

2010 Archives

UCSB Engineering Programs Rated Among Nations Best
UC Santa Barbara College of Engineering (link)
The National Research Council (NRC) published its long-awaited report evaluating over 5,000 doctoral programs in 62 fields at 212 universities in the United States. Leading the rankings is the Materials Department, which was ranked number one over its entire range, and was the only science or engineering department in the country to be ranked so highly.
LA's Lighting Revolution featuring Professors Shuji Nakamura & Steven DenBaars
CNN.com (video link)
LA's lighting revolution: Los Angeles invests in new LED technology to be more efficient with its electricity consumption. CNN's Richard Quest reports.

Yellow Luminescence in GaN is Down to Carbon
CompoundSemiconductor.net (link)
Scientists at the University of California, Santa Barbara (UCSB), have finally resolved a 30-year old mystery: why carbon, commonly believed to be a shallow acceptor in GaN, can give rise to luminescence at 2.2 eV, in the yellow region of the spectrum.

The UCSB Institute for Energy Efficiency (IEE) Announces Graduate Student Fellows
The The Institute for Energy Efficiency
(link)

The Peter J. Frenkel Fellowships assist top-ranked senior PhD students working in the Institute’s six Solutions Groups. Both Stacey Kowsz and Ingrid Koslow received fellowships and are graduate student researchers with UCSB’s Solid State Lighting & Energy Center (SSLEC).

UCSB Achieves Semi-polar Light Extraction Comparable to Conventional LEDs
Semiconductor-Today.com
(link)
Researchers at University of California Santa Barbara (UCSB) have improved the extraction efficiency of light-emitting diodes (LEDs) grown on semi-polar nitride substrates to the level of conventional c-plane devices.

UCSB Achieves CW Operation of AIGaN-Cladding-Free Nonpolar Lasers
Semiconductor-Today.com (link)
University of California Santa Barbara (UCSB) has succeeded in producing continuous wave pure-blue (461nm) nonpolar (m-plane) laser diodes without using aluminum gallium nitride (AlGaN) cladding.

Green Photonics
Photonics.com (link)
Lasers are not all that's going green in the photonics inducstry. Photonics technologies are helping to reduce energy consumption. Examples include Solid State Lighting: Reducing diffraction losses through new approaches to LED die and packaging is one approach to gaining brightness and efficiency. Other advances include improving the efficiency of the phosphor system. For example, according to an April 2009 article in Nature Photonics by Siddha Pimputkar, James S. Speck, Steven P. DenBaars and Shuji Nakamura of the University of California in Santa Barbara.

UCSB reports first packaged blue LEDs on (30-3-1) nitride substrates
Semiconductor-Today.com
(link)
University of California Santa Barbara (UCSB) researchers have reported data on what are claimed to be the first blue (452nm) packaged high-power/efficiency semi-polar (30-3-1) nitride light-emitting diodes (LEDs).

Ionization Density; The Answer To Absorption Loss in Green Lasers?
CompoundSemiconductor.net (link)
UCSB computational scientists who investigated the light absorption by carriers in nitride lasers found that the low ionization density of the magnesium dopant atoms was a major contributor to absorption losses.

Breakthrough bulbs usher in LED lighting
Optics.org (link)
"A" class general LED bulbs launched by top lighting firms this year are the start of a push to replace familiar incandescent lights in our homes, discovers Andy Extance.*

Quantum wells with AlGaN barriers increases blue-green laser light output
Semiconductor-Today.com
(link)
Researchers from the University of California Santa Barbara (UCSB) have reported improved 516nm ‘green’ laser diode performance from using aluminum gallium nitride (AlGaN) for the quantum well barriers.

UCSB Buildings Receive LEED Certifications From Green Building Council
UCSB Press Release (link)
A recent addition to the Engineering II building (new location for the Solid State Lighting & Energy Center) received LEED Gold certification in the New Construction category.

UCSB Engineering Programs Rated Amoung Nations Best (link)
UCSB's College of Engineering was ranked number 19 overall, tied with Harvard, and two of its specialties ranked in the top 10 –– materials at number 4 and chemical engineering at number 9.

 

Semipolar Blue LED with 39.5% External Quantum Efficiency
Semiconductor-Today.com
(link)
University of California Santa Barbara (UCSB) researchers have used semipolar (10-1-1) nitride semiconductor material to create blue (~450nm wavelength) light-emitting diodes (LEDs) with external quantum efficiencies (EQEs) of 39.5% at a drive current of 20mA, which beats a previous highest EQE of 29% for a comparable blue semipolar (10-1-1) device.


Dr. Won-Bin Im is leaving for Chonnam National University in Kwangju, Korea after spending 3 years as a postdoctoral researcher with SSLEC.


Pictured here are Drs. Jun Suda and Erin Young. Dr. Suda was a guest speaker at the June 18th Nitrides Seminar. Topic: AlGaN/SiC heterovalent-junction bipolar transistors.

The Changing Shape of Light
CBS News (link)
Where America Stands: New ways are being developed to light our world, from the bendable to the organic.

Low threshold for m-plane nitride semiconductor lasing
Semiconductor-Today.com (link)
Threshold currents for aluminum gallium nitride (AlGaN) cladding-free m-plane indium gallium nitride (InGaN) laser diodes (LDs) have been reduced to levels comparable to those for traditional ‘state-of-the-art’ c-plane devices in research carried out by University of California Santa Barbara.

2010 Emilio F. Bumatay Memorial Scholarship Recipient Announced
Mr. Chih-Chien Pan is named the 2010 Emilio F. Bumatay Memorial Scholarship recipient.

Mr. Pan is a first year Ph.D. student in the Materials Department and is involved with the Solid State Lightening and Energy Center. Mr. Pan completed his Master’s Degree at UCSB in Electrical and Computer Engineering in 2009. Mr. Pan’s is working to improve the brightness of LEDs based on III-Nitrides materials. He is experimenting with growing different LED structures to increase emission power, developing a new package method for LEDs, and combining the 2 procedures to make LEDs more efficient. Mr. Pan is currently the Associate President of Taiwanese Student Association at UCSB, a Team Leader of Intramural Basketball Competition at UCSB, and is affiliated with Taipei Economic Cultural Office in Los Angeles. Mr. Pan’s goal is to make contributions to the UCSB research teams and to the society.

In memory of his father, Mr. Ernie G. Bumatay and his wife Rebecca Bumatay donated $1,000 for the Emilio F. Bumatay Memorial Scholarship for a 1st or 2nd year graduate student working on energy efficiency research in LED lighting, solar cells, bulk crystal growth, and/or lasers. The Emilio F. Bumatay Memorial Scholarship is a series of scholarships donated to the College of Engineering since 1999 to outstanding engineers, computer science majors, and students interested in becoming entrepreneurs. This is the second scholarship supporting a student working at UCSB's Solid State Lighting and Energy Center (SSLEC).
Chih_Chien Pan
Chih-Chien Pan with Professor Steve DenBaars

2010 New Venture Competition Winner! (link)
At the March 14, 2010 11th Annual New Venture Competition sponsored by UCSB’s Technology Management Program, Jacob Richard, founder of Solution Deposition Systems (SDS), received the “Best Pitch” award which included a cash prize of $4,000 and the “Office Incubator Lease Award” provided by Ventura Ventures Technology Center V2TC. Jacob is a Ph.D. student at UCSB’s Materials Department focusing on ZnO research in solid state lighting.
Jacob Richardson
Jacob Richardson, UCSB (Photo by Karen Ko, College of Engineering)

Materials Ph.D. student Ingrid Koslow receives the Institute for Energy Efficiency (IEE) Frankel Fellowship – Koslow, a PhD student in Prof. Steven DenBaars’ group, has been declared a winner of an Institute of Energy Efficiency Peter J. Frankel Foundation Fellowship for the academic year 2010-2011. The award, which recognizes excellence in research related to new energy-efficient technologies, comes with a cash prize of $2500 and invitations to various Institute events, including the Santa Barbara Summit on Energy Efficiency. Koslow’s doctoral research has been primarily devoted to improving efficiency in longer-wavelength light emitting diodes, such as green and yellow, with the goal of developing higher efficiency white lighting. Koslow is involved in Engineers Without Borders Lighting Group, whose project is to develop affordable solar-powered LED lanterns that can be used by villagers in Ghana to light their homes, schools and community centers. Koslow is a recipient of the 2008 Emilio Bumatay Memorial Fellowship. Prior to coming to UCSB, Ingrid attended the University of British Columbia where she received the Arthur Crooker Prize for Experimental Physics.
Ingrid Koslow
Ingrid Koslow, UCSB

Yet Another Angle on Nitride Laser Diodes
Semiconductor-Today.com (link)

University of California Santa Barbara (UCSB) and Japan’s Mitsubishi Chemical have used semi-polar free-standing gallium nitride (GaN) substrates oriented with (30-31) surface planes (Figure 1) to create laser diodes (LDs) emitting at wavelengths of around 444nm

UCSB Scientists (Chris G. Van de Walle, David Awschalom) Look Beyond Diamond, Develop Road Map for Research on Other Materials with Defects Useful for Quantum Computing
UCSB Press Release (link)

UCSB Daily Nexus (link)
A team of scientists at UC Santa Barbara that helped pioneer research into the quantum properties of a small defect found in diamonds has now used cutting-edge computational techniques to produce a road map for studying defects in alternative materials.

The Greentech Hall of Fame - Shuji Nakamura
Greentechmedia.com (link)
UCSB Daily Nexus (link)

The Greentech Hall of Fame salutes 40 innovators in green for the 40th anniversay of Earth Day. Shuji Nakamura is ranked #21following Alchimedes, Henry Ford, Thomas Edison, and before Lord Kelvin, Steven Chu and Al Gore.

Good Grades for GaN HEMT Ohmic Source/Drain Contacts
SemiconductorToda
y (link)
University of California Santa Barbara (UCSB) researchers have used graded indium gallium nitride (InGaN) layers to create an ‘ultra-low’ contact resistance ohmic contacts for nitride high-electron-mobility transistors (HEMTs) with a non-alloy metal [Sansaptak Dasgupta et al, Appl. Phys. Lett., vol96, p143504, 2010]. The researchers achieved contract resistances as low as 27Ω-μm.

Professor Chris Van de Walle has just been awarded the distinguished title of MRS Fellow of the Materials Research Society. The title of MRS Fellow is highly selective and honors MRS members who are notable for their distinguished research accomplishments and their outstanding contributions to the advancement of materials research, world-wide. The maximum number of new Fellow appointments each year is limited to 0.2% of the current MRS membership and truly reflects significant achievements.
Materials Research Society: MRS Fellows 2010

The IET Kelvin Lecture 2010
The Institution of Engineering and Technology TV

Shuji Nakamura
Lighting up the future - the way ahead for solid-state lighting
Article & Video

LEDs to Light Up the World
RSC Chemistry World (link)

White light emitting diodes are set for a bright future in the household and commercial lighting markets.

Nitrides Race Beyond the Light
http://www.sciencemag.org (link)
By Robert F. Service

Long prized for their properties, nitrogen-based semiconductors may take realms where silicon cannot tread.

Lasers Get The Green Light
Spectrum.ieee.org (link)
By Richard Stevenson
Compact green-light sources could slash the cost of laser TV. What the world needs now is a semiconductor laser that's good, cheap, long-lasting, powerful, and truly green. Such a device could revolutionize information display, improve certain ophthalmological therapies, and give us affordable televisions with bigger, more dazzling pictures than the best available today.

Prestigious Harvey Prize Awarded at the Technion to Prof. Shuji Nakamura
Yediot Acharonot Financial Section "He Saw the Light" (PDF)
Article Image: (JPG)

Press Release (link)
UCSB Press Release (link)

UCSB Press Release 93106 (link)
Semiconductor Today (link)

edhat.com Santa Barbara (link)

Prof. Nakamura received the prize “in recognition of his seminal contributions to light sources based on nitride containing III-V semiconductors. Prof. Nakamura pioneered the research that led to the first semiconductor laser producing blue emission which increases significantly the density of optical storage devices. His work on nitride containing light emitting diodes led eventually to the white light LED which totally revolutionized lighting concepts. These white light LEDs will dominate light producing systems as they are significantly more efficient than conventional incandescent light bulbs ensuring huge reductions in energy consumption.

Application-Oriented Quantum Theory for Infrared Nitride Lasers?(link)
Semiconductor-Today.com

It is proposed that ‘application-oriented nitride substrates’ be developed using bulk indium gallium nitride (InGaN) to lattice match the laser epilayers that are needed for longer wavelengths. Sharma and Towe point out that Shuji Nakamura managed to create nitride semiconductor light-emitting diodes emitting red light of 600nm wavelength in 1996. The researchers comment: “We believe it would be possible, by using this concept, to make nitride lasers at the fiber-optic communication windows at 1.3μm and 1.55μm, thus eliminating the need to use the hazardous arsenide/phosphide materials currently used to make communication lasers.”

LED's at Photonics West - 94% of the Light Gets Out! (link)
Semiconductor.net - Mike Watts
Academics and industrialists from all over the world provided a series of first class papers on LED’s at this years  Photonics West in San Francisco. For me, the most impressive was a paper by Elison Matioli  from UC Santa Barbara (UCSB) who reported a 94% extraction efficiency by burying a photonic crystal in a working LED.

Record-setting SPIE Photonics West Includes Tribute to Laser (link)
Spie.org

Among the well-attended plenary talks were an OPTO symposium talk before a packed hall by LED pioneer Shuji Nakamura (Univ. of California, Santa Barbara) on recent developments in blue and green laser diodes.

LED's: The Decade's Top Ten Innovations in Police Technology (link)
PoliceOne.com

High output LED's are considered one fo this decade's top ten innovations in police technology.

 

 

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