Novel/Interesting LED Uses from Sandia Labs

AlexGT

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Jan 15, 2001
Messages
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Houston, Texas
I like to find out more about this, 120 lumen led!

Quote
"Matsushita Electric Industrial Co. has developed a new white LED light source, according to a February 27th report in AsiaPulse News. The LED light source generates 120 lumens of light by combining 64 LEDs together in a 2 cm square space on a (nondisclosed) substrate with excellent heat radiation properties. The light source is only 3 mm thick (about one-fifth the thickness of existing devices). Matsushita says its new substrate is more than 200 times better at radiating heat away from LEDs -- each 1-watt increase boosts the temperature by only 1.2 degrees C, which allows the LEDs to handle 8 watts (vs. 0.1 watt) and makes the entire LED array brighter. The lifetime of the light source is about 10,000 hours. [ Article in AsiaPulse News, no URL available]"
 

AlexGT

Flashlight Enthusiast
Joined
Jan 15, 2001
Messages
3,651
Location
Houston, Texas
This one is interesting too!

Quote:
"United Epitaxy Company has released a 10-Watt AlGaInP high-power LED made using a proprietary "metal bonding" technique. The LED is grown on a GaAs substrate, with a grid-pattern ohmic contact metal layer and a high-reflectivity metal layer deposited on top of the LED epiwafer. The metal layers of the LED epiwafer are then bonded to a silicon substrate and the GaAs substrate is removed, leaving a diode consisting of a silicon substrate soldered to the metal layers, overlain by the AlGaInP LED wafer. The output of these "metal bonded" AlGaInP on-silicon LEDs increases linearly with drive current up to 5 A. The total flux from a single 2.5 x 2.5 square mm emitter is more than 200 lm at 12 W input power, with luminous efficiencies around 18 lm/W. Compared to AlGaInP-on-GaAs LEDs, metal bonded AlGaInP-on-silicon LEDs are twice as bright at 150 mA due to their greater heat dissipation and light extraction capabilities. [ Article in CompoundSemiconductor.net – page 1, page 2 ]"
 
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