Osram Infrared thin-film chip leaps to 72 percent efficiency

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slebans

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Osram Infrared thin-film chip leaps to 72 percent efficiency.
http://www.osram-os.com/osram_os/en...diodes/2012/infrared-thin-film-chip/index.jsp

The prototype of a 1 mm2 chip in infrared thin-film chip technology has achieved an efficiency of 72 percent from an operating current of 100 milliamps. This efficiency, known as wall plug efficiency (WPE), indicates the ration of the radiated power to the electrical input power.
 
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jtr1962

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This is impressive on two fronts-both for the achievement itself, and for the fact that these will actually be in production within a few months. At the rate LEDs are going, pretty soon heatsinking will be a non-issue.
 
saabluster

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This is impressive on two fronts-both for the achievement itself, and for the fact that these will actually be in production within a few months. At the rate LEDs are going, pretty soon heatsinking will be a non-issue.

Heatsinking a non-issue? Really?! Don't you know us at all? They will still get pushed until the light can no longer handle the thermal load even if that is 100 watts or more. Heatsinking will always be an issue until 100% conversion is achieved. Which it won't. ;)
 
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jtr1962

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Heatsinking a non-issue? Really?! Don't you know us at all? They will still get pushed until the light can no longer handle the thermal load even if that is 100 watts or more. Heatsinking will always be an issue until 100% conversion is achieved. Which it won't. ;)
Well, at some point LEDs will get so efficient that everything the batteries can throw at them won't be enough to make them hot. Or maybe by then we'll have 100,000 mAh 18650s capable of putting out a few hundred amps. :)
 
AnAppleSnail

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Heatsinking a non-issue? Really?! Don't you know us at all? They will still get pushed until the light can no longer handle the thermal load even if that is 100 watts or more. Heatsinking will always be an issue until 100% conversion is achieved. Which it won't. ;)
A 10w LED gives enough light to rival a 60w filament, the mysterious gold standard of home lighting. But at about 25% WPE, its fixture has to export 7.5w of heat. One of my soldering irons is only twice that powerful.

At double efficiency that same LED (filing a given lighting need) could take 5w, give the same light, and only handle 2.5w of heat. This reduces the heat load by 2/3ds so that the fixture can be smaller and cheaper. That's where the money is: more light, less power, less metal.
 
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jtr1962

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I actually made a chart along those lines for a 100 watt equivalent LED bulb (1700 lumens):

LED_Cooling_Comparison.gif


Things start getting very interesting once we get above 100 lm/W, and especially above 200 lm/W. Heatsinking requirements go from hefty to practically zero. In fact, a lot of the losses once we get to higher efficiencies are in the phosphor. In this case roughly 1.3 W watts are lost in the phosphor regardless of blue emitter efficiency but those 1.3W are a greater percentage of the total losses as efficiency increases. If you use remote phosphor then your heatsinking requirements drop even more dramatically. You go from 10.5 W at 100 lm/W down to only 2.0 W at 200 lm/W in terms of heat which must be removed from the back of the emitters.

Note also that efficiencies above ~250 lm/W are simply shown for academic reasons. With current blue plus phosphor technology, at best you'll obtain roughly 265 lm/W, assuming a 100% efficient blue emitter.
 

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