Lumileds claims double LED brightness

[saabluster]

Interesting. Sounds like they are trying to move away from encapsulation. Don't hold your breath waiting on this to come to market though.

"Its internal internal quantum efficiency was measured in the range 60–69%. Deriving the extraction-efficiency from these results gave a range of 68–78%, eventually giving an average figure of 73%. As well as impacting on device brightness, encapsulants also tend to degrade at higher flux densities. Therefore, finding ways to reach high extraction-efficiencies without them holds promise for higher-brightness LEDs."

 

[HarryN]

Interesting work. It fits PL's general strategy of driving down cost per lumen by increasing the output per die.

- decreasing the temperature sensitivity
- lowering Vf
- photonic crystals for light extration (similar to Luminus)
- higher drive currents
- continuous improvement in efficiency
- getting rid of those pesky encapsulants.

If I had to recall product like they did in 2007 due to encapsulant problems, I might have the same motivations.

It could just be that no one can make an encapsulant that meets their 5 year technology plan.

 

[SemiMan]

Interesting work. It fits PL's general strategy of driving down cost per lumen by increasing the output per die.

- decreasing the temperature sensitivity
- lowering Vf
- photonic crystals for light extration (similar to Luminus)
- higher drive currents
- continuous improvement in efficiency
- getting rid of those pesky encapsulants.

If I had to recall product like they did in 2007 due to encapsulant problems, I might have the same motivations.

It could just be that no one can make an encapsulant that meets their 5 year technology plan.

The recall was not encapsulants, it was the epoxy that bonds the die to package.

This press release DOES NOT talk about getting more LUMENS out, but making the "brightness" higher. This is related to the fact the encapsulant increases the effective source size reducing the apparent surface brightness. For general lighting, the improvement will mainly be cost. For us flashight people, this is very good as it will increase the throw of our flashlights or allow us to use smaller reflectors.

Semiman