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LEDS 10Q expected JULY11
LEDS 10Q expected July 3
LEDS roll the dice
LEDS new 52 week low
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SemiLEDs portfolio of products along with partner enabled packages based on SemiLEDs chips, offer a strong value proposition to LED users in various industry segments. SemiLEDs patented and unique vertical LEDs are metal alloy devices which provide advantages in design and value that are unparalleled in the industry. SemiLEDs' Metal Vertical Photon Light Emitting Diode (MvpLED™) devices fabricated using SemiLEDs' proprietary and patented process technologies, are the next generation High Power LEDs for advanced applications, including solid state lighting. MvpLED™ chips use an advanced metal alloy process, thus have excellent thermal and electrical conductivity, allowing the MvpLED chips to operate under extreme conditions that are not suitable for conventional InGaN LEDs on sapphire or SiC. SemiLEDs' MvpLED™ devices are fabricated with thinned n-GaN up structure (patented) to enhance light output efficiency and maximize the vertical injection of current into the device active layers. With the vertical structure and ultra-thin GaN, MvpLED™ devices exhibit a nearly perfect Lambertian light emission pattern. MvpLED's™ patented metal alloy processes are also the best solutions for both high performance and excellent reliability. The MvpLED™ chip is designed to maximize the effective emitting area to meet the light pattern requirements of high power chips.
General LightingThroughout human history, developments in lighting technologies have brought about profound pragmatic shifts in human behavior. From the oil lamps of ancient Egypt, to the candles of the Bronze Age, to Edison's light-bulb and its ensuing technologies such as the fluorescent tube; new lighting technologies have enabled new human capabilities and changed the way we live. We stand once again at the dawn of a new era in lighting technology that is sure to change our expectations and capabilities in more dramatic ways than ever before. The Light Emitting Diode (LED) reduces our energy consumption by up to 90%, is cold to the touch, has no glass or harmful chemicals, and practically lasts forever. The era of changing light bulbs is over. SemiLEDs manufactures some of the most efficient and reliable LEDs in the world. Our award winning patented technology features the most efficient LED chip design. Having SemiLEDs LEDs in your LED lighting system is your best guarantee for maximizing the advantages of your LED system. The innate advantages of SemiLEDs' unique technology provide the ideal building blocks for lighting manufacturers looking to meet new energy and environmental criteria. Highlights of LED advantages: · Efficiency - presently over 120 Lumens/Watt and on their way to 250 Lumens/Watt · Visual appeal - Saturated vivid colors without the use of filters · Install and Forget - Up to 100,000 hours with virtually no maintenance · Compact form factor - Design flexibility and enabling new applications and designs · Cool to the touch - for Heat-Sensitive Environments · Safety - Low-voltage operation enables Off Grid Lighting /Solar/Battery-Powered Applications · Robustness - Perfect for harsh environments and Outdoor Applications · Vibration Resistance - Ideal for Automotive, Transportation and Aircraft Lighting as well as Task lights · UV and IR free - LED white lights have no Infrared and Ultraviolet radiation · Cold-Temperature Operation - Replacing CFL, Fluorescent, Metal Halide / HPS apps in cold countries or environments LED ChipsSemiLEDs MvpLED chips are metal alloy devices which are made using a patented process entailing a vertical structure. This unique approach provides superior performance at various levels.
SemiLEDs chips also feature:
Quality by DesignThe advantages of the patented and proprietary MvpLED™ design especially in Thermal management, and Optical efficacy, are realized in light quality, lifetime, color consistency, reliability and overall efficiency of the luminaire. Available in Blue, Green and Ultraviolet (UV), SemiLEDs high efficiency chips bring real benefits to any lamp or luminaire manufacturer.
Thermal Advantages: Among pure metals at room temperature, copper has the second highest electrical and thermal conductivity after silver. Furthermore, due to the high thermal conductivity of the copper alloy layer, the heat generated in our device is effectively conducted. This is a major advantage for any lamp or luminaire manufacturer. No matter how good a thermal design is if the contact material to the junction is a poor conductor then the cooling effects of the heat-sink are significantly reduced.
Greenest LEDsMost LEDs are built on Sapphire wafers. On average, more than 200 kWh of electricity are spent on making a 2 inch Sapphire wafer; a significant environmental burden. Other manufacturers dice the LEDs without removing the Sapphire. Sapphire is a less effective conductor of heat acting as a bottleneck for heat transfer from the junction to the heat-sink. The Sapphire wafer is also lost.
ReliabilityReliability and consistency are extremely important characteristics of an LED. Any designer looking to design an LED into a lighting system should consider not only how the LED will perform on hour 1 but also on hour 1k, 10k and 100k. It is evident that most LED deterioration is due to poor thermal management. Excessive heat at the junction can damage the crystal quality, the bond pads, and even alter the chemistry of a Phosphor or an encapsulant material thus making it less transparent. As a general rule of thumb, the more efficiently you can drive heat away from an LED, the more consistent and more reliable your lighting system will be.
SemiLEDs patented MvpLEDTM design maximizes the efficacy of any thermal management system by maximizing the heat transfer rate from the junction to the LED package. Many thermal designs are very good however if the material on which the LED structure is built is a poor conductor of heat, such as Sapphire or Silicon, then the overall efficacy of the system is in question. SemiLEDs uses copper alloy, an excellent conductor of heat, thus eliminating the bottleneck effect.
The effects of SemiLEDs efficient Copper alloy devices can be felt in the lifetime and light quality of packaged chips producing white light. Packages using SemiLEDs LEDs, as opposed to conventional Sapphire LEDs, maintain initial CCT values over time. Packages using Sapphire LEDs experienced a CCT shift of more than 20% towards the blue end of the spectrum, while packages using SemiLEDs LEDs only experienced a CCT shift of 2%. This is due to the heat effects on the phosphor chemistry.
DatasheetsBLUE LEDs
UV LEDs
GREEN LEDs
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