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: No fumbling, just tap, say Moto X tattoo all-stars (w/ Video)

add to favorites email to friend print save as pdf

Related Stories

The birth of topological spintronics

31 minutes ago

The discovery of a new material combination that could lead to a more efficient approach to computer memory and logic will be described in the journal Nature on July 24, 2014. The research, led by Penn S ...

Student develops filter for clean water around the world

1 hour ago

Roughly 780 million people around the world have no access to clean drinking water. According to the World Health Organization (WHO), 3.4 million people die from water-related diseases every year. ETH student Jeremy Nussbaumer ...

How much magma is hiding beneath our feet?

1 hour ago

Molten rock (or magma) has a strong influence on our planet and its inhabitants, causing destructive volcanic eruptions and generating some of the giant mineral deposits. Our understanding of these phenomena ...

Recommended for you

Fukushima study: Think about unthinkable disasters

41 minutes ago

(AP)—A U.S. science advisory report says a key lesson from Japan's Fukushima nuclear accident is that the nation's nuclear industry needs to focus more on the highly unlikely but super-serious worst case scenarios.

FX says overnight ratings becoming meaningless

1 hour ago

(AP)—It's a rite nearly as old as television: the morning after a new show premieres, network executives wait impatiently for the Nielsen company's estimate of how many people watched, and rush to report ...

UK: Former reporter sentenced for phone hacking

2 hours ago

(AP)—A former British tabloid reporter was given a 10-month suspended prison sentence Thursday for his role in the long-running phone hacking scandal that shook Rupert Murdoch's media empire.

Evaluating system security by analyzing spam volume

3 hours ago

The Center for Research on Electronic Commerce (CREC) at The University of Texas at Austin is working to protect consumer data by using a company's spam volume to evaluate its security vulnerability through the SpamRankings.net ...

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