news digest compound semiconductor
rhombus4
Hitachi Cable Develops High-Power 55-Lumen Red LED
Chips - 8 Jan, 2010
TOKYO—(BUSINESS WIRE)—Hitachi developed a high-brightness red LED chips electrode on the upper chip layer.
Cable, Ltd. (TOKYO:5812) has announced (hereafter referred to as an “MR-LED By employing fine line electrodes, Hitachi
the development of a high-power red LED chips”) that form a metal reflector (MR) Cable has succeeded in achieving uniform
chip(1) offering a maximum luminous flux of under the light emitting layer. This product is dispersion of current across the entire chip
55 lumens(2),(3). This luminous flux was currently being supplied to LED package surface without blocking light from the light
enabled by increasing the size of the LED manufacturers and other customers. emitting layer, thus attaining a maximum
chip and use of a fine line electrode luminous flux of 55 lumens in a large LED
structure. Through its LED business, Hitachi Cable chip measuring 1 mm by 1 mm—equivalent
has recognized the growing demand for to the combined output of 21 MR-LED
LEDs are semiconductor solid-state higher output LED chips. The company has chips (0.33 mm x 0.33 mm).(4)
components that convert electricity directly incorporated fine electrode structures and
into light. With their capacity to emit light of enlarged chip dimensions to develop high- With its higher output, the new LED chip is
a specific color without color filters and at power red LED chips offering outputs as expected to find applications not only in
low operating voltages, LEDs are used as high as 55 lumens. display applications, but also as a light
indicator lights in a wide range of source for devices such as projectors.
equipment, appliances, and devices. One of the methods of improving per-chip
light output is to increase the chip Hitachi Cable will continue to pursue active
Recent progress in luminous efficiency and dimensions. However, larger chips increase development of higher-power LED chips
the widespread commercial manufacture of the difficulty in distributing a uniform current while expanding its lineup of high-power
blue and green LEDs has rapidly expanded across the entire light emitting layer. LED chips, including yellow and infrared
the use of LEDs in full color display and LED chips.
illumination applications, including traffic On the other hand, if large electrodes are
lights, automobile rear signal lamps, and positioned in the upper layer of the chip for (Note 1) LED stands for Light Emitting
large outdoor display panels. a more uniform current dispersion, light from Diode.
the light emitting layer will be blocked,
Hitachi Cable manufactures supplies reducing the light extraction efficiency. (Note 2) Lumen (lm) is a unit for light
aluminum gallium arsenide (AlGaAs) intensity that accounts for the human eye’s
epitaxial wafers and aluminum gallium To resolve these problems in developing a sensitivity to visible light.
indium phosphorus (AlGaInP) epitaxial new LED chip, instead of using larger
wafers, both of which are compound electrodes, Hitachi Cable has utilized two (Note 3) Optical output at a current of
semiconductor wafers for red LEDs. pad electrodes for receiving power, a 500 mA
backbone electrode connecting the two
In response to demand for LEDs of higher electrodes, and multiple fine line (Note 4) Compared to our MR-LED chip
luminous efficiency, the company has also electrodes that extend from the backbone (0.33 x 0.33 mm, at 20 mA, 2.6 lm)
Ascent Solar Hires Vice President of Manufacturing - 6 Jan, 2010
Ascent Solar Technologies, Inc, a developer of two solar module factories with a total recently Mr. Rakes served as a plant
of state of the art flexible thin-film solar capacity of 474 megawatts while completing manager for Intel’s Colorado Springs,
modules, announced today that Zane Rakes the project on time and on budget. Colo. operations. Mr. Rakes holds a
has been hired to serve as the Company’s B.S. in Business Administration from the
Vice President of Manufacturing Operations. Zane brings the experience, skills and University of Phoenix. “This is an exciting
Mr. Rakes brings over 16 years of contacts necessary to ramp up our time and opportunity to become a part of
experience in high volume manufacturing production from Fab 2 and evaluate the Ascent Solar team as it begins its
systems, inventory management, potential expansion possibilities going expansion and ramp up of its high volume
manufacturing automation systems and forward.” Fab 2 facility.
global supply chain management.
Immediately prior to joining Ascent Solar, Ascent Solar has a truly light weight flexible
Ascent Solar President and CEO Farhad Mr. Rakes was Director of Operations for unique thin-film technology that can
Moghadam stated, “Zane has a proven track Concentrated Solar Power and transform the way solar is used in many
record of leadership in establishing and Photovoltaics at SCHOTT Solar, Inc. Prior ways. I look forward to leading the
scaling up high volume production facilities. to SCHOTT Solar, Mr. Rakes worked at manufacturing expansion and technological
Most recently Zane led the construction, Intel Corporation for over 15 years holding optimization going forward,” stated Mr.
installation, start up and production ramp up various manufacturing positions. Most Rakes.
22 www.compoundsemiconductor.net January/February 2010
Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87