Osram has developed a red led with 61% efficiency

[William Gaatjes]

I do not know if this is already posted, but about 6 weeks ago there was a news item about a record setting 61% efficiency for a red led.
Typical efficiency of leds peaks at around 49 % for the best leds.
Although some reports claim that led lamps can already reach up to 92 percent, that is a false number and has nothing to do with luminous efficiency. Those numbers seem to come from a wrong method of measuring light output. Osram mentions electro-optical efficiency, i do think that it is the same as luminous efficiency. If i am wrong, please rectify me.

http://www.osram.com/osram_com/News...iconductor/2011/111011_Laboratory_record.html

A red high-power LED has set a new efficiency record in an OSRAM Opto Semiconductors R&D lab with an electro-optical efficiency of 61%. The 1 mm2 chip housed on a laboratory package emits at a wavelength of 609 nm (λ-dom) and has achieved a record value of 201 lm/W at an operating current of 40 mA. At a typical operating current of 350 mA its luminous efficacy is still an impressive 168 lm/W, which means that even at this high wattage more than half of the electrical energy is converted into light.

LED color mixing systems such as the OSRAM Brilliant Mix concept are the latest trend, particularly for general illumination applications. These systems enable any kind of white light to be produced, from Warm White through Neutral White to Daylight White. The overall performance of the system is as good as the individual components will allow. OSRAM’s new red high-power LED promises a further improvement in the quality of light with lower power consumption, especially in Warm White. This will benefit not only color mixing concepts but also all applications that use high-efficiency red LEDs – in the general illumination, projection and automotive sectors.

Higher efficiency means more light from the same amount of electricity, which in turn means lower power consumption for a particular application. Because fewer chips are needed to produce the same brightness level, designers will have greater freedom. The light sources can be made smaller while still producing the same brightness. Dr. Martin Behringer from the LED development team at OSRAM Opto Semiconductors, said: “The results of this project can be extended to all the wavelengths in InGaAlP chip technology so we anticipate a boost in efficiency in these light colors – even at 660 nm which is the wavelength needed for plant lighting for example. Probably we will be introducing the results of this development project across the entire wavelength spectrum into production in about a year’s time.”

The enormous increase in output was achieved by a chip with the latest generation of the company’s own thin-film technology.

http://en.wikipedia.org/wiki/Luminous_efficacy

 

[Doppel]

Wish I was smart enough to know how important this is Glad people like you with your numbers and sh*t can make me nice gadgets I can use.

 

[Zebo]

Efficient is one thing longevity another. Red's last a fraction as long as Blues and greens leaving you with similar problems in video equipment and monitors.

 

[William Gaatjes]

Wish I was smart enough to know how important this is Glad people like you with your numbers and sh*t can make me nice gadgets I can use.

That is what we are here for...
Never noticed how all nerds and geeks are typical aliens in build and behavior ? :biggrin:

Efficient is one thing longevity another. Red's last a fraction as long as Blues and greens leaving you with similar problems in video equipment and monitors.

For as far as i know, red and green have the longest life time and blue the shortest life time with respect to reduction of light output. But this is highly depended on the type of led technology used. These leds use materials different materials when compared to organic leds.

I do know that when the temperature of the led crystal is reduced(current as low as possible, that the lifetime goes up with magnitudes). Thus the same light output with less current should mean extended longevity. Because more current does also mean more heat.

 

[skyking]

That is huge. Many people don't know how inefficient many of these technologies are. Photovoltaic is down below 15%, for example. get that up near 50% and it becomes much more viable.

 

[hal2kilo]

We're saying goodbye to incandescents now, flourescents will be next.

This afternoon, I will be replacing my dead security light that uses incandescent floods with an all led unit I bought from Costco yesterday. If I like the way it works I'll replace my other one that's also failing.