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MIT Researcher Demonstrate LED Die Just 3-Atoms-Thick
LIGHTimes News Staff
March 11, 2014...Researchers from MIT have demonstrated an LED that is just 3 atoms thick.
Details of the development were published in Nature
Nanotechnology. The device was made of the thinnest possible sheet
tungsten diselenide. The scientists first used a natural crystal of tungsten
diselenide. Then they exfoliated the crystal to sheets just a few layers thick
using mechanical cleaving with a semiconductor grade, low-tack tape.
The Au/Pd-based gates for the LED were patterned using e-beam lithography on
a silicon substrate that was very well doped with silicon oxide. The
researchers then used a microscope with a long working distance of objective
and a micro manipulator to transfer the tungsten diselenide onto the gates. The
WSe2 sits on top of the HfO2 and is contacted by one Au and one Pd contact that
each measure 1 µm wide and are 50nm thick with a chromium sticking layer. They
used one Au and one Pd contact to “reduce the influence of contacts
on the performance of the device”
Typical diodes are fabricated using a process of by “doping,” or
injecting other atoms into a host material’s crystal structure. However,
with atomically thin layers of tungsten diselenide, either p-type or n-type
functionality can be produced by bringing the thin film into very close to an
adjacent metal electrode and tuning the electrode’s voltage from positive
to negative. This allows the material to be easily and instantly be switched
from p-type to n-type or vice versa. This is rarely possible with conventional
Philips Lumileds Introduces High-Voltage LEDs
LIGHTimes News Staff
March 11, 2014...Philips Lumileds debuted a mid-power LED, the LUXEON 3535 HV. The company
says that the high voltage LED allows lighting manufacturers to design in high
voltage drivers that are smaller compared to standard drivers for a simplified
design and have a lower total cost of the overall lighting solution. The
company’s high voltage mid-power portfolio is available in 24V and 48V
“The advantage of designing in high voltage LEDs is that they
utilize drivers containing on average less than 20 components, relative to
standard LED drivers that can contain up to 50 components. As a result, the
total BOM cost can be reduced, and the amount of inventory they need to carry
to design the driver is minimized,” said Michael Howley, product
manager at Philips Lumileds.
The Luxeon 3535 HV can be used in space constrained lamps such as retrofit
bulbs, downlights, wall sconces, wall packs, and pendant luminaires.
“We’re finding that manufacturers of wall packs, wall sconces
and pendants in many different regions of the world are interested in high
voltage LED technology and the design simplicity it affords,” said
Philips Lumileds provides LM-80 data for its 24V and 48V LUXEON 3535 HV
LEDs. The LEDs are offered with a 1/9th micro color binning structure with 3-
or 5-step color accuracy. At 48V and 20mA the LED has typical lumen output of
120lms and 125 lm/W at a color temperature of 4000K and 80 CRI. The 24V version
of the LED at 20mA produces 60 lm at 125 lm/W at a color temperature of 4000K
and CRI of 80.
Vishay Intertechnology Releases Two New IR Emitter / Photodiode Matched Pairs
LIGHTimes News Staff
March 11, 2014...Vishay Intertechnology, Inc. of Malvern, Pennsylvania USA, has introduced
two new matched pairs of AEC-Q101-qualified, high-speed 940 nm infrared
emitters and silicon PIN photodiodes. The emitters and photodiodes have
side-view, surface-mount packages measuring just 3 mm by 2 mm.
The VSMB10940X01 / VEMD10940FX01 have a profile of 1 mm. The VSMB11940X01
and VEMD11940FX01 have a profile of 0.6 mm. The company claims that this is the
lowest profile for side-looking, AEC-Q101-qualified components.
The newly released devices offer an extremely wide ± 75° angle of half
intensity. The VSMB10940X01 / VEMD10940FX01 andVSMB11940X01 / VEMD1194FX01
pairs are optimized for IR touch panels in devices including eBook readers,
Ultrabooks, printer displays, smartphones, tablets, and automotive interior
touch displays for multimedia and navigation. With their 0.6 mm profile, the
VSMB11940X01 / VEMD 11940FX01allow are designed for slimmer applications while
the larger photosensitive area of the VSMB10940X01 / VEMD10940FX01 enables
higher signal output than the IR emitter/photodiode pair.
The VSMB10940X01 andVSMB11940X01 infrared emitters employ GaAIAs multi
quantum well (MQW) technology and come in clear, untinted plastic packages. The
devices deliver high radiant intensity of 1 mW/sr with typical at 20 mA; low
forward voltage of 1.3 at 20 mA and fast switching times of 15 ns.
The VEMD10940FX01 and VEMD11940FX01 photodiodes feature a daylight-blocking
filter matched with 830 nm to 950 nm IR emitters. They have reverse light
current of 1.1 µA and 3 µA, respectively. Both provide high radiant sensitivity
from 780 to 1050 nm, low dark current of 1 nA, and 950 nm wavelength of peak
The VSMB10940X01 / VEMD10940FX01 and VSMB11940X01 /VEMD1194FX01 have a floor
life of 168 hours and moisture sensitivity level (MSL) of 3 in accordance with
J-STD-020. The RoHS-compliant, halogen-free, and Vishay Green emitters and
photodiodes support lead (Pb)-free reflow soldering.
The new IR emitter / photodiode pairs are now available for sampling and in
production quantities with lead times of eight to 10 weeks.
Sumitomo Chemical to Market Dual-Color Polymer OLED Lighting
LIGHTimes News Staff
March 11, 2014...Sumitomo Chemical will exhibit its polymer OLED lighting at
“Light+Building 2014,” in Frankfurt, Germany, from March 30 to
April 4, 2014. Sumitomo Chemical will also showcase an elaborate OLED panel
installation that is called “OLED Cosmos” at the conference.
Japanese lighting designer, Motoko Ishii created the exhibit.
“OLED Cosmos” features bright colored OLED panels. These panels
stand in stark contrast to the Japanese traditional colors that Sumitomo
Chemical’s OLED panels produced at the 2012 Light + Building. The
lighting panels like the others displayed last in 2012 are extremely thin,
which has been a difficult form factor to achieve with conventional
Sumitomo Chemical is apparently the first in the world (based on the
company’s industry survey in February 2014) to have developed the
technology to mass-produce dual-color emission OLED panels that allow a single
panel to be printed in two distinct colors based on the company's printing
method. The company can produce OLEDs in a wide range of lighting colors, from
light that closely resembles sunlight, to vivid and neutral colors for design.
Sumitomo Chemical will begin selling its polymer OLED lighting panels in April
The polymer OLEDs in the “OLED Cosmos” demonstration take
advantage of the company’s simplified process for fabricating what the
company calls PLEDs. The process apparently requires four fewer layers to
produce white light than what the company previously produced called SMOLEDs.
The SMOLED requires blue, green, and red EML (emissive layers), an electron
transport layer, an electron injection layer, a hole transportation layer, and
a hole injection layer. However, the PLED only requires a single white emissive
layer, an interlayer, and a hole injection layer.
DOE’s CALiPER Program Finds Almost All LED-based MR16 Lamps Deficient in Center Beam Intensity
LIGHTimes News Staff
March 6, 2014...The U.S. Department of Energy's CALiPER program has published a Snapshot
Report on LED-based MR16 lamps. The report utilizes the LED Lighting Facts®
program's extensive product database to examine the current state and
trajectory of the market for that class of products.
The report points out “the conventional halogen MR16 lamp is one
of the most difficult lamps for LED technology to successfully replicate. This
is especially true for 12 V, 50 W halogen lamps, which are the highest-wattage
that is commonly available.”
The report indicated that the Lighting Facts Label database has revealed a
relatively steady increase in the lumen output and center beam intensity in
LED-based MR16 lamps. However, the CALiPER report showed that very few
LED-based MR16 lamps are truly comparable to 50W halogen MR16 lamps. While
several met the Energy Star threshold of the center beam intensity for a 35 W
According to the report, the equivalent center beam candle power has been
the most difficult metric to achieve. The design of a high intensity center
beam LED is especially difficult. It requires either a very compact array of
several LED die or a very powerful single LED die. Notably two LED industry
technology leaders, Cree and Philips Lumileds have recently come out with LED
chips that boast extremely high center beam candle power. In addition to the
LED die, optics are required to steer the LED light emission at a very tight
The report stated, “Of the small subset of MR16s that provided
data for beam angle and center beam intensity, only one would meet the minimum
ENERGY STAR® center-beam candlepower criterion for equivalence to a 50W halogen
MR16 at the same beam angle (40°).”
The overall number of MR16s listed by LED Lighting Facts increased slightly
over the past three years, and they now account for only 4 percent of all
listed products, compared with 11 percent three years ago. The mean efficacy
for newly listed LED MR16s changed minimally over the past two years. Lumen
output and input power have both increased steadily in the past few quarters.
For this reason, the luminous efficacy has changed little.
On average, the MR16 lamps listed by LED Lighting Facts have slightly better
color quality than other lamp types, with a higher percentage of MR16 lamps
having a color rendering index above 90.
The report warned that as with all LED lighting categories, there is
substantial variability in the performance of LED MR16 lamps listed by LED
Lighting Facts, and specifiers and consumers should evaluate each product on
its own merits.
Konica Minolta Achieves 131 lm/W Efficiency with OLED Panel
LIGHTimes News Staff
March 6, 2014...Konica Minolta of Tokyo, Japan, reported on its Japanese web
site that the company has achieved 131 lm/W with a 15 square cm area white
OLED. Unlike conventional light sources, OLEDs are thin and open up unique
design possibilities. Konica Minolta’s latest OLED record efficiency
takes advantage of functional organic material design technology and organic
material growth and synthesis techniques, such as dye and the development
silver halide photosensitive material for OLED lighting, and the application of
previous research for practical use.
In 2010 Konica Minolta was chosen as one of the contractors of the OLED
lighting project "infrastructure technology development of next-generation high
efficiency and high quality illumination" (NEDO) to implement National
Institute of New Energy and Industrial Technology Development Organization.
The technology of Konica Minolta resulted in an OLED panel with
light-emitting area of 15-square-centimeters that achieves 103 lm / W luminous
efficiency and was exhibited at the cutting edge IT · Electronics Comprehensive
Exhibition CEATEC JAPAN 2013 in October last year. Through further optimization
the company achieved the world’s highest luminous efficiency for an OLED
of 131 lm / W. This improvement in internal quantum efficiency resulted from
the use of the company’s new blue, proprietary phosphorescent material.
The light extraction efficiency of the OLED was also enhanced by the
company’s proprietary internal light extraction technology, and the
organic layer construction techniques that were optimized based upon optical
Panel Manufacturers of Taiwan to Lead 4K TV Shipments, According to NPD Display Search
LIGHTimes News Staff
March 6, 2014...4K LED display panels are more available and affordable to TV manufacturers
than previously. Taiwan-based panel makers Innolux and AUO are the forecasted
leaders in 4K panel shipments worldwide this year. According to the latest
report from NPD Display Search these two companies are forecast to have 58% of
the market share in 2014. Korean manufacturers (Samsung Display and LG Display)
are projected to make up 25% of the market, and Chinese manufacturers
(ChinaStar and BOE) will together produce 14% of the panels worldwide.
Display Search says that Chinese makers of 4K LED LCD TVs have a
significantly different strategy than other global brands. Display Search says
that global brands tend to want to maximize image quality, but Chinese brands
hope to sell 4K TVs at a small premium in their domestically. Display Search
notes that in order to reduce cost and increase sales some panel makers are
promoting reduced-specification 4K TV. However, this strategy may not fit well
with top brands positioning 4K TV as a high-end product.
The company notes that Chinese brands continue to lead 4K TV manufacturing
and shipments. Thus, according to the company, "4K panel demand from
China’s top six TV brands is crucial to all panel makers." China Star
predicts that 90% of its 4K TV panels will go to China’s top six brands,
BOE 70%, Innolux 57%, and AUO 56%. Samsung Display and LG Display, which are
the top global TV panel makers, have what Display Search describes as
"relatively modest plans for 4K panel production". They expect much of their
production to go to their affiliated TV brands, Samsung and LGE. These brands
plan to each get about 60 percent of their 4K LED TV panels internally in
“The 4K display demand from their related TV brands is critical to
the ability of Samsung Display and LG Display to compete effectively within the
growing 4K TV market,” said Deborah Yang, research director for
monitors and TV for DisplaySearch. “The ability of the Korean panel
makers to expand 4K panel production is dependent on their success in securing
more 4K display clients, beyond satisfying the needs of their own 4K TV
“The rise of the 4K TV market is mainly driven by the supply side,
while leading TV brands are concerned about the value proposition of 4K
TVs,” Yang said. “While some TV brands are considering
increasing their 4K TV shipment targets, we continue to see a mismatch between
4K TV panel supply plans and consumer purchasing expectations.”
Researchers Demonstrate LED-based "Optical Lab On-a-Chip"
LIGHTimes News Staff
March 6, 2014...The Bioengineering Department of Ecole Polytechnique Federale de Lausanne
(EPFL), in Lausanne, Switzerland has demonstrated a handheld biosensor on a
chip. Professor Aydogan Ozcan of UCLA along with Professor Hatice Altug of EPFL
and postdoctoral fellow Arif Cetin of EPFL developed the "optical lab on a
chip". The device was detailed in a publication of Nature Light:
Science & Application.
The device reportedly can analyze up to 170,000 different molecules in a
blood sample simultaneously. The device could enable an extremely wide variety
of applications including examining insulin levels, diagnosing cancer, and
looking for Alzheimer markers or certain viruses.
While traditional biosample imagers analyze the spectral properties of the
sample, the new technology examines changes in the light intensity to do
on-chip imaging. It basically analyzes the collective oscillation of
electronics when in contact with light. This technique eliminates the need for
often large spectrometers. The relatively tiny device that is just 7.5 cm tall
and weighs just 60 grams is one step closer to being the "Triquarter"
envisioned in early Star Trek Episodes.
The device employs an LED, a single CMOS chip, and a 10 square millimeter
gold plate with an array of minuscule holes with a diameter of 200nm. Nanoholes
on the gold substrates are compartmentalized into different sections of arrays.
Each section functions as an independent sensor. Special biofilms coat the
sensors of each section. These biofilms specifically attract targeted proteins.
This design allows multiple different proteins in the biosamples to be captured
and monitored simultaneously.
Essentially, the LED light shines through the nanoscale openings. Then, the
CMOS chip records its properties. The presence and number of biomolecules
changes the properties of the light passing through the tiny holes. This
enables easy deduction of the number of particles trapped on the sensors.
The research team hopes to work with local hospitals to find the
technology's best uses.
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