We’ve Just Scratched the Surface – Adoption, Science, Integrated controls
... The US Department of Energy recently held its annual Market Development Workshop in Detroit, Michigan, with a few key takeaways for anyone in attendance. We’ve just scratched the surface on adoption – When you’re immersed in the industry, it’s easy to understand the compelling case for LED lighting versus...
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Cubic GaN Shows Potential for LEDs
LIGHTimes News Staff
December 16, 2014...Anvil Semiconductors and the Cambridge Centre for GaN at the University of
Cambridge report having grown cubic GaN on 3C-SiC (silicon carbide) wafers using
MOCVD. Anvil produced the underlying 3C-SiC layers using the company's patented
stress relief IP that enables growth of device quality silicon carbide on 100mm
diameter silicon wafers. Anvil contends that the process can work with 150mm
diameter wafers and possibly beyond without modification and is therefore
suitable for industrial-scale applications. In a project funded by Innovate UK,
the MOCVD growth trials at Cambridge resulted in single phase, cubic GaN. The
layers, characterized by XRD, TEM, photoluminescence and AFM, have potential
for LED applications.
According to the researchers, the cubic GaN may be able to remove the strong
internal electric fields, which plague conventional green LEDs, impair
recombination, and make it difficult to address high internal quantum
efficiency (IQE). Also, the researchers note that cubic GaN has a narrower
bandgap and improved p-type electrical properties compared to the conventional
hexagonal GaN phase used for LEDs. Therefore, a commercializable process to
produce cubic GaN on large diameter silicon wafers may help increase the
efficiency and reduce the cost of LED lighting.
The team plans to continue development to eventually fabricate sample LEDs
before looking for an industry partner to commercialize the technology.
Sanan Orders 50 MOCVD Reators from Veeco for LED Production
LIGHTimes News Staff
December 12, 2014...Veeco Instruments Inc. of Plainview, New York USA, announced that Sanan
Optoelectronics, the largest LED manufacturer in China, has ordered 50
TurboDisc® EPIK700™ Gallium Nitride (GaN) Metal Organic Chemical Vapor
Deposition (MOCVD) reactors for the production of LEDs. This order is the
equivalent of 25 EPIK700 MOCVD “C2” (cluster) systems.
“Sanan chose the EPIK700 due to its industry leading cost of
ownership model and excellent footprint efficiency,” said Zhiqiang
Lin, vice chairman and CEO of Sanan. “Our beta testing of EPIK700
proved its production-worthiness, and we are confident in its capabilities and
value to our Xiamen business expansion plans. Veeco has been a great partner
for Sanan as we have solidified our position as the top LED manufacturer in
China and increased our business outside of China as well.”
Veeco's EPIK700 MOCVD system uses the company's TurboDisc technology to
achieve a cost per wafer savings of up to 20 percent compared to previous
generation MOCVD systems. The savings comes through increased productivity,
improved wafer uniformity, and reduced operating expenses.
“This large order from Sanan, the largest single purchase order
Veeco has received since 2009, speaks volumes about the EPIK700’s
production readiness and the recovery in the MOCVD market,” said
John Peeler, Veeco’s chairman and CEO. “We are in a great
position to continue to serve our LED customers with the best MOCVD technology
and customer support, and remain the industry leader.”
XL Video Provides LED Columns for Hugo Boss Event
LIGHTimes News Staff
December 16, 2014...Working for client, Bureau Betak, XL Video supplied 40 4-sided LED columns
and media control for the New York Fashion Week show of Jason Wu for Hugo Boss.
The show took place at 4 World Trade Center on the eve of 9/11. Agency Bureau
Betak approached XL Video’s senior account executive, Tim Riley, to
design and produce the catwalk event. Bureau Betak asked Riley to deliver
dozens of 10’ tall columns of LED displays.
Each of the 40, one-foot-wide square columns was encased in XL’s
Pixled 9mm LED video display. To make the columns appear seamless, XL
Video’s R&D team in China manufactured a set of custom rails for the
LED to clip to. The custom rails were affixed to the wooden columns that the
set company built. The rails ensured that all the LED could be mounted to the
columns in just 24 hours by XL’s Project Manager, Will Nazarowski and
lead LED technician, Curtis Luxton.
Don Stevens, liaised with both Bureau Betak and the content creators to
map-out the content across all 160 facets of LED to ensure the client’s
content looked flawless and flowed across the columns.
Stevens controlled the content on the day of the event using one of
XL’s Stumpfl Wings Quad media servers.
Tim Riley commented, “Bureau Betak came up with and delivered an
incredible design for Hugo Boss. The show inside the new 4 World Trade Center
building, just a day before 9/11, made this a topical and poignant event, and
was made more impressive by its view and location on the 48th
Startup Allos Semiconductors now Offers Licensing for Azzurro's GaN-on-Si Patents and Technology
LIGHTimes News Staff
December 16, 2014...ALLOS Semiconductors GmbH, a newly founded company based in Dresden,
Germany, who specializes in GaN-on-Si technology, announced that it has
acquired all the patents and technology of former Azzurro Semiconductors at an
auction. In addition to its existing offering of GaN-on-Si technology ALLOS is
now making the AZZURRO technology platform available through technology
transfer, licencing and customised development work.
In June of 2014, ALLOS Semiconductors was formed to help meet the growing
demand for technology of growing gallium nitride on silicon substrates
(GaN-on-Si). An increasing number of LED and power semiconductor companies want
to be able to grow 150 and 200 mm GaN-on-Si wafers to supply cost-effective
high-quality GaN devices that can be processed in standard silicon fabs.
Allos complements the GaN-on-Si technology licensing with advice on business
and technology strategies and support for setting up GaN-on-Si operations all
the way from establishing a epitaxial wafer fab to market entry.
Specialized 3D Printer Prints Quantum Dot LEDs
December 16, 2014...A team, led by Michael McAlpine at Princeton University's McAlpine Research
Group, has successfully used its 3D printer to print quantum dot LEDs,
according to a CNET article.
The printer cost about $20,000 and took two years to develop. QLEDs reportedly
shine brighter, more efficiently, and with purer color than OLEDs. The ultra
thin, flexible, and transparent QLEDs use cadmium selenide nanocrystals.
The team printed the LED in five layers. First, a ring made of silver
nanoparticles was formed on the bottom layer to be the metal conduit for a
mechanical circuit. Two polymer layers were then created to supply and transfer
the electrical current to the next layer. The fourth layer consists of cadmium
selenide nanoparticles (the quantum dots) in a case of zinc sulphide. The top
and final layer is the cathode, made of eutectic gallium indium.
"What we have presented here is an additional method to integrate
electronics that can take into consideration the three-dimensional geometry of
an object," said study lead co-author Yong Lin Kong. He also noted that
this is the first example of a fully 3D printed, fully functional electronic
Potential applications for the technology include wearables, such as contact
lens. The team is also investigating the inclusion of a 3D-printed transistor
for additional functionality.
New Infrared LED from Osram for Biometric Identification Systems
LIGHTimes News Staff
December 11, 2014...Osram has debuted the Oslux SFH 4780S, a high output IR LED that emits at a
wavelength of 810 nm. Osram notes that the IR LED with a height of just 2.4 mm
and a narrow emission angle, could pave the way for reliable, energy efficient
biometric identification such as iris scanning incorporated into mobile
devices. Osram contends that a wavelength of 810 nm is particularly suitable
because it can provide high-contrast pictures of the irises of any color at
comparatively low levels of light.
"The SFH 4780S from Osram Opto Semiconductors currently offers the best
performance-to-size ratio. The SFH 4780S is the first IRED in the new
high-performance Oslux package. Oslux LEDs have long been established for
visible lighting applications in mobile devices, such as camera flash. We are
now extending the range to include infrared emitters," explained Bianka
Schnabel, marketing manager for infrared products at Osram.
Oslux components offer a narrow emission angle at a low height because they
perfectly match the lens to the internal reflector. Also, despite the use of a
lens, the Oslux has a flat component surface. Despite the low height of 2.4 mm,
developers have managed to achieve an emission angle of only +- 10 degrees for
a record radiant intensity of typically 2900 milliwatts per steradiant (mW/sr)
at an operating current of 1 amp (A).
The IR LED's high optical output comes from a stack of two thin-film chip
with an edge length of 750 mm arranged one above the other with the aid of
Osram’s nanostack technology. The emitter can operate with a current of
up to 2 A in pulsed mode. Thanks to its black package, the SFH 4780S can be
integrated unobtrusively behind the covers of mobile devices.
Unlike current designs which often use several IREDs, this new IRED with
high radiant intensity enables the iris scanner operation with just one compact
emitter. Like all applications that expose the eye to infrared light, iris
scanners must comply with the relevant eye safety standards.
LEDs Help Algae Grow in the Tank
LIGHTimes News Staff
December 11, 2014...Scientists at the Technische Universität München (TUM) have developed
together with the Berlin LED manufacturers FUTURELED a methodology of
simulating a wide variety of lighting conditions. The scientists are studying
the growth of algae with various light conditions.
According to estimates, there are about 50,000 algal and cyanobacterial
species. However, only about 5,000 of these are known to date. Of these, only
ten species have been grown for a commercial use. Algae and cyanobacteria can
thrive even in salt water pools or on infertile soils and use much less energy
to grow than food crops. Researchers are also looking to Algae to potentially
be used in the production of aviation fuel.
"Algae grow much faster than soy or corn. You do not need fertile soil,
pesticides per hectare per year and could bring a ten times higher yields,
" said Professor Dr. Thomas Brück , head of the Department of Industrial
Biocatalysis the TU Munich.
Scientists have already discovered numerous interesting products from
various algae species. Many algae can produce, protein mass or build fat's
chemical intermediates. Protein mass could be used as fodder to fuel or could
be produced from the fats.
However, they have found that even within a species the ability to produce
certain products is highly variable. "In our studies, we see again and
again large differences in productivity," says Thom's camp. "We have
to find not only the right kinds but also uses the candidate with the highest
The researchers worked with Berlin company, FutureLED to develop a light and
climate simulation to optimize algae cultivation. The researchers use
combinations of colored LEDs to simulate the spectrum of sunlight.
"No one can predict whether an alga from the South Seas under the
lighting conditions in Germany is as productive as in their home," said
Thomas Brück. "Nor do I know what this successful candidates would still be
just as successful under the lighting conditions of the Sahara.All this we can
test in our laboratory now. "
The efficient LEDs offer light that is between 400 and 800 nanometers in
wavelength with a radiant power of up to 1000 watts per square meter and the
sunlight comes close to uniform intensity distribution. Scientists can control
the different types of LEDs individually to set individual spectra. Fluorescent
and incandescent bulbs produce too much heat and do not allow the easy light
variation. The researchers specifically needed the LEDs to activate the
molecular switches of the algae that help control plant growth.
The project is funded through Industrial Biocatalysis project in the
framework of the research project algae aviation fuel. Other project partners
are the Departments of Biotechnology (technical scale cultivation) TUM and
Chemistry II (catalytic conversion, Clariant AG (algae processing, fat
separation) and the conys GmbH (hydrogen / biogas production). South of Munich,
on the campus Ludwig Bölkow (LBC), researchers are currently building on the
campus Ludwig Bölkow (LBC), a technical center for the study of the algal
culture on a large scale. The Free State of Bavaria and the Airbus Group
supporting the project with 12 million euros.
Zhaga Consortium Starts Working on New COB LED Array Specification
SSL Design News Staff
December 11, 2014...The Zhaga Consortium, which develops specifications for interchangeable LED
light sources, is now working on a new Book that will include Chip-on-Board
(COB) LED arrays. COB arrays are in widespread use, but different manufacturers
offer a wide range of alternative sizes. The consortium notes that this creates
problems for luminaire makers and other stakeholders such as COB holder
suppliers and limits their options of using alternative products from different
“We consulted many luminaire makers, and received broad support
for our plans to standardize this type of LED light source,” said
Musa Unmehopa, secretary general of the Zhaga Consortium. “These
companies asked us to standardize properties such as the mechanical dimensions
of the module, the position of electrodes, and the diameter of the
Zhaga says its standardization removes arbitrary variations in a small
number of parameters, to allow interchangeability of LED light sources. The
consortium contends that for customers, standardization simplifies the
comparison and selection of products. The consortium says that it allows
COB-array makers to focus on offering value-added differentiation to customers,
such as luminous efficacy, quality of light, or thermal properties.
“For Zhaga Books to be successful, they need to reflect the wishes
of the market,” said Unmehopa. “We welcome any input from
COB makers or other companies, who are invited to join Zhaga and contribute to
the ongoing discussions.”
The new Zhaga Book will define rectangular and square LED modules with a
circular light-emitting surface (LES) and a separate LED driver. The Book will
define a family of modules with different dimensions. In the majority of cases,
modules that are compliant with the new Book will employ COB technology* for
the light-emitting section. However, the Zhaga specification will not prevent
the use of alternative technology approaches.
After extensive discussion the consortium decided to specify a family of six
rectangular or square modules, with the following PCB dimensions: 12 x 15 mm,
16 x 19 mm, 19 x 19 mm, 20 x 24 mm, 24 x 24 mm, and 28 x 28 mm.
The circular LES sizes defined in the new Book will correspond to the LES
categories specified in several current Zhaga Books that cover spotlight
modules (Books 3, 5, 10 and 11). COB LED arrays are used both with and without
holders, depending on the luminaire type and application. The consortium
expects that the new Zhaga Book will also include specifications for these
In common with other Zhaga specifications, the new Book will only restrict
the parameters necessary to enable interchangeability. In addition to PCB
dimensions and thickness, such parameters are likely to include the location of
the LES centre point; the position and size of the electrode positions; and the
location of the thermal measurement point.
Screw holes will be optional, since many COB arrays are mounted directly
using a thermal interface material. However, if screw holes are used, then
their position and size should conform to the Zhaga specification.
Zhaga plans to discuss whether other features should be part of the
specification such as a current-setting resistor to the board, for example, or
the adding a temperature sensor to prevent over-temperature operation.
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