... As a result of a midnight premier of Star Trek - Into Darkness last night (this morning, technically), the forward-looking technology thoughts are flowing judiciously. Apparently I walked into the conclusion of the discussion on when and where the movie was happening, only to catch the part where I... Read the editorial...
(if it resists... go here)
to your LED Chips, Phosphors, Optics, Drivers news channel!
opportunities presented by the increasing rapid adoption of high brightness LEDs,
in all their forms and applications, represents nothing short of a "digital
revolution" for a previously "analog" world. LEDs are having a
substantial disruptive effect on a number of established technologies, and where
there is disruption, there is an intense need for information.
LIGHTimes Online is here to serve the information needs of the LED industry
supply chain, as well as integrators and non-architectural application solution
providers with technology, product and market news updates for these rapidly evolving
devices. Our readership also includes LED packagers, technology enablers and service
companies seeking the the answers to how best to meet their customers' needs.
architectural lighting and applications news of interest specifically to lighting
designers, specifiers, and architectural lighting decision makers, along with
luminaire designers, lighting system integrators and lighting subsystem developers,
please visit our sister publication, Solid
State Lighting Design.
is booming and the 2011/2012 Summit Series is coming back to keep the message
Launched in 2008, the SSL
Summit will bring the quality story to New York City in October 2011, and
then back to LA in March 2012. At every one of the Summit events, the feedback
remains consistent: Just what we need, do it again soon. The Summit brings together
lighting decision makers with industry thought leaders, pioneers, and innovators
from the across the solid state lighting eco-system.
Continuing the tradition, 2011/2012 will continue
to be all about quality, quality, quality.Showcase
participants and sponsors are vetted to separate the wheat from the chaff
(have your IES LM-79 test reports ready!). Last year's event in NYC included
representatives of over 100 million square feet of developed property, and the
one thing we don't want to leave out for 2011 is you! Look into the series information
at www.SSLsummit.com for the details.
Sponsorships are available for the full series.
May 16, 2013...QD Vision of Lexington, Massachusetts, a developer of quantum dot based LEDs,
reports having achieved 19 cd/A efficiency and 18 percent external quantum
efficiency. QD Vision’s latest QLED performance results are currently
published in the 21
April 2013 issue of Nature Photonics. In the article, QD Vision reports
achieving 18% External Quantum Efficiency (EQE) with a color saturated red
quantum dot-based LED.
The company claims that this puts QLEDs near the fundamental efficiency
limit of the technology which the company says is 20 percent for quantum
dots.These results are two times higher efficiency than previously reported
state-of-the-art efficiency of a QLED device. QD Vision says its current and
luminous power efficiency are better than the best evaporated OLED result of
the same color coordinate, and significantly better than what
solution-processed OLEDs have thus far achieved.
In comparison, Pacific Northwest National Laboratory (PNNL) recently
reported 11 percent external quantum efficiency for a blue organic light
emitting diode (OLED) at 800 cd/m2. However Phosphor-based OLEDs are apparently
not included in the company's comparison statement.
“This paper clearly demonstrates the fundamental efficiency
advantage that QLEDs have over any other emissive display technology. Achieving
this milestone is a great breakthrough and the result of years of hard work and
dedication to achieving what others may have thought impossible,”
said QD Vision co-founder Seth Coe-Sullivan.
While at an earlier stage of development and commercialization than QD
Vision’s Color IQTM products, QD Vision says that its QLED performance is
already suitable for use in certain products that require precision color
solutions in an ultra-slim form factor, including monochrome visible and
infrared displays, and lighting devices for machine and night vision
Government Subsidies Decrease for China LED Chip Makers; Taiwan LED Chip Makers to Benefit from Reduced Price Pressure LIGHTimes News Staff
May 9, 2013...China's LED chip makers have seen a large decrease in government subsidies
this year, according to an article by Peoples
Daily. Numerous companies have relied on the subsidies to offer lower
prices. The market is currently facing overcapacity.
Companies such as Sanan Optoelectronics which produces LED die and can offer
it at very low prices will be hardest hit. Other companies such as Elec-Tech
which produces LED production equipment will also suffer from the reduced
Peoples Daily cited 21cbh.cn, which said that Sanan Optoelectronics received
government subsidies totaling 328 million yuan ($53.3 million) in 2012, 805
million yuan in 2011 and 2.53 million yuan in 2010. These subsidy amounts
reportedly accounted for 40.5 percent, 85 percent and 60.4 percent of its net
profits respectively during these years.
According to People's Daily, Elec-Tech would likely have suffered
losses in 2010 and 2012 if it weren't for subsidies.
One result of the reduced subsidies is that the pace of LED price drops is
expected to slow down. Taiwan-based LED chip makers noted that prices for LEDs
have fallen about 35 percent in the last two years, according to Digitimes.
Sanan, a leader in China's LED industry, has reportedly chosen to be less
aggressive in its price cuts, likely because of the reduced subsidies.
Digitimes noted that with prices stabilizing, TV backlighting
demand returning and the lighting market growing, Taiwan-based firms are likely
to see strong performance in the second and third quarter of 2013.
New Conductive Die Attach Adhesive Supports Small Die and LEDs LIGHTimes News Staff
May 9, 2013...Engineered Material Systems, a global supplier of electronic materials for circuit assembly applications based in Delaware, Ohio USA, debuted its CA-105 Low-Cost Conductive LED Die Attach Adhesive. The Conductive LED Die Attach Adhesive is for attaching LEDs and other small semiconductor die to silver and copper lead frames.
The company notes that EMS CA-105 is approximately half the cost of a pure silver filled die attach adhesive. The company says that it has a high glass transition temperature (Tg) to facilitate wire bonding small die, has low extractable ionics and high adhesion to silver and copper lead frames. CA-105 has a dispensing open time (pin transfer) greater than 24 hours (measured as a 25 percent increase in viscosity), while maintaining optimized rheology for pin transfer or needle dispensing.
CA-105 is the latest addition to Engineered Material Systems’ extensive line of electronic materials for semiconductor, circuit assembly, photovoltaic, printer head, camera module, disk drive and photonic applications.
Researchers Use Strain Engineering to Improve Green LED Light Output LIGHTimes News Staff
May 8, 2013...Researchers from the Chinese Academy of Sciences’ Institute of
Semiconductors, Beijing, and University of Hong Kong have used strain
engineering to improve the light output of Green LEDs. The researchers improved
the light output of a 530nm green LED operating at 150 mA by 28.9 percent [Hongjian Li et al, Appl. Phys.
Express, vol6, p052102, 2013].
The researchers note that green-emitting nitride semiconductor LED
structures tend to suffer from low light output due to the difficulty in
producing the high-indium-content indium gallium nitride (InGaN) needed for
longer-wavelength light emission. In addition to the material quality
challenge, strain induced by the lattice mismatch with pure GaN leads to large
piezoelectric effects, giving electric fields that tend to pull electrons and
holes apart, reducing rates of recombination into photons (i.e. the
quantum-confined Stark effect, or QCSE), thus reducing quantum efficiency.
The Chinese team inserted a layer of lower-indium-content InGaN before the
high-In-content light-emitting layer. Simulations suggested that such a layer
could reduce the strain-dependent electric fields in the active light-emitting
multiple quantum well (MQW) structure.
MOCVD on C-plane sapphire was used to produce epitaxial material with a
low-In-content InGaN shallow quantum well (SQW) step. A 325nm helium-cadmium
laser was used to excite the photoluminescence spectra of the materials at low
temperature (85K) and room temperature (298K). One effect of the SQW was to
reduce the width of the spectral peak full-width at half maximum (FWHM) at 85K
from 16.7nm for the conventional LED material to 13.1nm for the SQW material.
The 298K measurement reduced the conventional FWHM of 20.1nm to 15.7nm. The
peak intensity was also higher with the SQW structure, therefore the SQW
material had improved crystal quality.
The peak height for the SQW material at 298K was 55.1% that at 85K. The
corresponding ratio for the conventional structure was 24.1%. The higher ratio
for the SQW material indicates a higher rate of radiative recombination and
higher internal quantum efficiency (IQE).
The electroluminescence was measured in an integrating sphere, giving light
output power–current–voltage (L–I–V) results. The
voltage performance is similar in the SQW and conventional devices. However,
the light output at 150mA is 28.9% greater in the SQW LED (49.3mW) over the
conventional device (38.4mW).
The researchers point out that improved overlap of the electron and hole
wavefunctions in the device leads to improved recombination into photons. The
external quantum efficiency (EQE) increased from 10.2–13.3% over the
conventional LED performance.
Klauf Lighting Introduces Relatively Inexpensive Remote Phosphor LED Light Bar LIGHTimes News Staff
May 2, 2013...After a year of research and development, Klauf Lighting of Lewes, Deleware
has introduced the Klauf light bar. Uniquely, the light bar takes advantage of
remote phosphor technology. The warm white light is also leverages better
dimming technology that is compatible with standard inexpensive dimmers. The
luminaire has an extruded aluminum housing and a yellow-orange diffuser, which
gives the Klauf light bar a distinctive appearance.
Unlike conventional LED lighting that uses blue LEDs packaged with a
phosphor coating to produce white light, a long phosphor material layer is
separated from the LEDs. The company contends that conventional phosphor
packaging keeps a blanket of heat at the source, diminishing the LED's light
quality and lifetime. However, Klauf says that by separating the phosphor from
the LED chip and instead coating the Klauf light bar's diffuser with the
phosphor compound, the LEDs are ensured a cooler operating temperature, which
helps ensure a longer life. Klauf also claims that this allows the fixture to
produce better-quality light - 80CRI and a 2700K warm white color
From a design standpoint, the Klauf light bar allows users to near
seamlessly chain multiple fixtures, end-to-end, and with only one power cord.
No bulky and unsightly transformers are required, as the LED driver electronics
are all contained in the small fixture's housing. The light emitted is fluid,
not pixelated like most other linear fixtures, eliminating multiple shadows on
work surfaces. And since the fixture is cool to the touch and small enough to
hold in your hand, the light bar's design also allows for portability. It's
available in 6 and 12-inch segments, can be used as a standalone fixture, or
connected to a series of other light bars. At only $55 for the 12-inch unit,
it's more than 70% less expensive than linear fixtures from other quality
manufacturers – fixtures using nearly the same or even less
Klauf has decided to launch its light bar on Kickstarter.com, a crowdfunding
source. "With this new and innovative fixture, we wanted to put it in the
hands of the real consumer, people who might not have been able to afford newer
LED technologies," stated Susan Hendrix of Klauf. "The Kickstarter
community is made from people who are excited to back projects by companies
which strive to produce better, more efficient, and affordable
Dow Corning Wins Two Awards from Lightfair International for Moldable Silicones LIGHTimes News Staff
April 25, 2013...Dow Corning accepted two LIGHTFAIR International (LFI) Innovation Awards
Tuesday. Specifically, Dow Corning beat 307 contenders to earn the prestigious
Technical Innovation Award, described by LFI as one of its top honors for
outstanding achievement in design and application. In addition, two products
– Dow Corning MS-1002 and MS-1003 Moldable Silicones – beat 15
competitors to win Best Product in LIGHTFAIR’s Non-Luminous Components
and Specialty Hardware category. LFI granted both awards to Dow Corning in a
well-attended ceremony on the exhibit floor Tuesday morning.
The company’s MS-1002 and MS-1003 Moldable Silicones reportedly retain
superb clarity and mechanical performance over the course of a lamp or
luminaire’s lifetime. Dow Corning notes that conventional LED materials,
such as epoxies, polycarbonates and acrylics can yellow and physically degrade
after prolonged exposure to temperatures of 150°C and high lumen density.
According to the company, long term clarity and durability of its MS-1002 and
MS-1003 moldable silicons is becoming increasingly attractive as LED sources
are increasingly expected to deliver more intense white light from
comparatively smaller package sizes, and as customers seek smaller designs with
higher luminous flux, which will also drive up temperatures at the device
Candidates for the prestigious awards are judged by an independent panel of
renowned lighting professionals, and recognize the most notable products and
designs introduced in the 12 months preceding the event, now in its 24th
“Winning these two awards is a true honor, and further highlights
Dow Corning’s expanding role in the LED lighting sector as a reliable
innovation partner and full-service global provider of optical-grade silicone
solutions,” said Eric Peeters, vice president, Dow Corning
Electronic Solutions. “We deeply appreciate LFI’s recognition
of our high-clarity moldable silicones, which deliver breakthrough mechanical,
thermal and optical stability as the increasing heat and lumen density of new
LED designs challenge traditional organic optical materials.”
Epistar Signs LED Collaboration and IP Licensing Agreement With Intermolecular LIGHTimes News Staff
April 23, 2013...Epistar, Corp. and Intermolecular, Inc. of San Jose, California USA, have
signed a collaborative development program (CDP) and royalty-bearing IP
licensing agreement to increase the efficiency and reduce cost of Epistar's LED
devices. Under this agreement, Epistar and Intermolecular engineers will
together leverage Intermolecular's High Productivity Combinatorial (HPC™)
technology platform for development and manufacturing qualification of novel
materials and processes for advanced LED products.
Intermolecular notes that in the highly competitive LED market, new
technologies created by R&D are needed to both improve light output and to
reduce costs. Intermolecular contends that using the HPC Platform, will help
Epistar accelerate the pace of R&D ten times or more compared to what can
be achieved in a conventional LED lab.
"After a rigorous review of Intermolecular's capabilities through an
initial collaboration engagement, we have seen how their combinatorial approach
to materials innovation and device integration can augment Epistar's leadership
in LED technology," said M. J. Jou, president of Epistar.
"Collaboration with our industry partners has been critical to our
world-leading R&D and manufacturing strategy. We are confident that
leveraging Intermolecular's team and technology platform will further increase
our competitive advantage."
Sandeep Nijhawan, senior vice president and general manager of
Intermolecular's clean energy group commented, "Entering into a strategic
engagement with a top-tier LED company like Epistar validates the applicability
and disruptive potential of the HPC technology platform for LEDs, a market that
continues to have tremendous room for growth and technology
Bridgelux and Toshiba Strengthen LED Business and Technology Collaboration with New Agreement LIGHTimes News Staff
April 23, 2013...Bridgelux Inc., of Livermore, California USA, will be selling its
GaN-on-silicon LED chip manufacturing assets. Along with its manufacturing assets, Toshiba will now employ certain of Bridgelux's relevant employees related to GaN-on-silicon LEDs and they will remain on site at Bridgelux's headquarters in Livermore California.
Toshiba will mass produce the GaN-on-silicon LED chips, and Bridgelux will be able to focus on developing lighting products. The agreement for an undisclosed amount,
further strengthens the close relationship between the two companies. The former Bridgelux employees now employed with Toshiba will remain onsite at Bridgelux’s headquarters in Livermore after the transaction closes to assure continued technical and business collaboration between the companies.
In January, 2012, Bridgelux and Toshiba entered into a Joint Development and
Collaboration Agreement for the development of GaN-on-Silicon LED technologies.
This agreement resulted in Toshiba’s announcements of world class
performance for 8” GaN-on-Silicon LED wafers and mass production of white
LEDs. Both used Bridgelux’s crystal growth and LED device technologies as
well as Toshiba’s advanced silicon processes and manufacturing
The new business opportunity expands the collaboration for next generation
LED chips and packages, or platforms, based on the jointly developed
GaN-on-Silicon technology, and secures Bridgelux a source of supply for
GaN-on-Silicon-based LED chips.
“Our agreement with Toshiba marks a tremendous milestone in our long
history of working closely together, allowing Bridgelux to capitalize on our
strong core LED technology platform, providing us with significant new capital
for growth, and reducing our capital requirements,” said Brad Bullington,
Chief Executive Officer of Bridgelux. “This agreement also allows us to
focus on what we do best, and what we think the market needs most at this point
in time: commercializing, productizing and bringing to market LED-based solid
state lighting technologies alongside a proven global scale semiconductor
manufacturing partner. We are one step closer to becoming the world’s
leading solid state lighting technology architecture company.”
“We are so excited with this deal that gaining GaN-on-Silicon
technology and related assets will contribute to drastically strengthening our
LED business, and bring us a high performance and competitive product line-up.
We fully expect our new Livermore team to play a leading role within Toshiba in
the development and rapid market penetration of GaN-on-Silicon LED
chips.” said Makoto Hideshima, Executive Vice President of Semiconductor
and Storage Products Company, Corporate Vice President of Toshiba.
“Entering a new phase of our relationship with Bridgelux, we will be able
to accelerate the scaled manufacturing of 8” GaN-on-Silicon LED wafers,
which will position both companies for strong growth in our respective LED
businesses. The GaN-on-Silicon technology that we acquire will also bring us a
breakthrough for Power Devices development and production. ”
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