Panasonic develops White Color Power LEDs by employing GaN Substrates

Mar 05, 2007
Panasonic develops White Color Power LEDs by employing GaN Substrates

Panasonic today announced that it has developed a blue LED element by employing GaN substrates for the first time in the industry.

From middle of March 2007, the company will mass-produce a white high-power LED series using these elements. Use of a GaN substrates, which has very high thermal and electrical conductivity, substantially improves the performance of this LED in the high current area, and achieves the industry's top-level output. The emitted light wavelength is 460 nm, the total radiation flux 355 mW at a forward current of 350 mA, with an external quantum efficiency of 38%.

Its marked crystal stability gives it high reliability as a device, and since the substrates and light-emitting layer have the same refractive index, the result is light delivery efficiency over 1.5 times that of the conventional company sapphire-based LED element.

The blue LED element covered with a uniform fluorescent layer results in a compact white high-power LED with little color variation. Application of this technology is likely to bring forward the development of new applications, such as LED-based lighting and camera flashes.

An LED produced on a sapphire substrates based on current primary technology suffers problems with light emission efficiency due to the difference in refractive index between the substrates and the light-emitting layer. Poor heat dissipation properties tend to result in saturation of output at high currents. The conventional fluorescence application process generates unevenness in the white color, and the large volume of the white light-emitting body limits the optical design possibilities of the lens.

Source: Panasonic

Explore further: Imec demonstrates 50GHz Ge waveguide electro-absorption modulator

add to favorites email to friend print save as pdf

Related Stories

Towards "printed" organic solar cells and LEDs

Mar 18, 2015

Flexible optoelectronic devices that can be produced roll-to-roll – much like newspapers are printed – are a highly promising path to cheaper devices such as solar cells and LED lighting panels. Scientists ...

OLED experts to advance improved production techniques

Oct 08, 2014

Back in May, Steven Shankland in CNET said that, for the lighting business, "the next technology is coming: OLED (organic light-emitting diode) lighting. It replaces the small, bright dots of LEDs with sheets of light that aren't so piercingly bright." Now MIT Technolog ...

Scientists find key to vitamin A metabolism

Dec 10, 2014

Researchers at Case Western Reserve University School of Medicine have uncovered the mechanism that enables the enzyme Lecithin: retinol acyltransferase (LRAT) to store vitamin A—a process that is indispensable ...

Molecular beacons shine light on how cells 'crawl'

Oct 24, 2014

Adherent cells, the kind that form the architecture of all multi-cellular organisms, are mechanically engineered with precise forces that allow them to move around and stick to things. Proteins called integrin ...

Recommended for you

Blue Freedom uses power of flowing water to charge

3 hours ago

Good friends may decide to tell you something that is not true but nonetheless sustaining: Nothing is impossible. That was the case of Blue Freedom co-founder who asked his friend if it would be possible ...

Special ops troops using flawed intel software

3 hours ago

Special operations troops heading to war zones are asking for commercial intelligence analysis software they say will help their missions. But their requests are languishing, and they are being ordered to use a flawed, in-house ...

Applications of optical fibre for sensors

8 hours ago

Mikel Bravo-Acha's PhD thesis has focused on the applications of optical fibre as a sensor. In the course of his research, conducted at the NUP/UPNA-Public University of Navarre, he monitored a sensor fitted to optical fibre ...

Twitter chief vows to help Indonesia fight disasters

8 hours ago

Twitter chief Dick Costolo said Thursday the microblogging site planned to work with Indonesian authorities to warn people about natural disasters that regularly hit the archipelago, from earthquakes to volcanic ...

Virtual robotization for human limbs

8 hours ago

Recent advances in computer gaming technology allow for an increasingly immersive gaming experience. Gesture input devices, for example, synchronise a player's actions with the character on the screen. Entertainment ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

bfreewithrp
not rated yet Apr 08, 2008
I would like to input my opinions along with a short article I've written on the future of the LED lighting technology.
At the end of the 19th century, man was awakened with a fabulous new lighting for all to enjoy. The incandescent light bulb was born. Thanks to the inventiveness and perseverance of one of the most famous inventors of our times, Thomas a. Edison, we are able to still enjoy its benefits, but can we still enjoy its luxuries?
http://www.quazen...er.17178
Led Lighting, The World's Final Frontier

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.