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: Twitpic to stay alive with new owner

add to favorites email to friend print save as pdf

Related Stories

Future of energy storage

19 minutes ago

MIT professor Fikile Brushett is in the process of taking the power generated by wind and solar, chemically lashing it to molecules derived from flora and fauna, and storing it in liquids until it's needed ...

Protecting infrastructure with smarter CPS

20 minutes ago

Security of IT networks is continually being improved to protect against malicious hackers. Yet when IT networks interface with infrastructures such as water and electric systems to provide monitoring and control capabilities, ...

Reducing traffic congestion, remotely

28 minutes ago

At the Intelligent Transportation Systems World Congress last week, MIT researchers received one of the best-paper awards for a new system, dubbed RoadRunner, that uses GPS-style turn-by-turn directions to ...

How to print your own cell phone microscope for pennies

36 minutes ago

At one o'clock in the morning, layers of warm plastic are deposited on the platform of the 3D printer that sits on scientist Rebecca Erikson's desk. A small plastic housing, designed to fit over the end of ...

Recommended for you

Alibaba prices IPO at $68 per share

8 hours ago

Alibaba, the Chinese e-commerce powerhouse named after a fabled, poor woodsman who discovers a thieves' den full of treasures, is ready to strike it rich on the New York Stock Exchange.

Home Depot breach affected 56M debit, credit cards (Update)

10 hours ago

Home Depot said that 56 million debit and credit cards are estimated to have been breached in a data theft between April and September at its stores in the U.S. and Canada. That makes it the second-largest breach for a retailer ...

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