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28 June 2007


Osram demonstrates brighter red and green LED chips

Achieved under laboratory conditions, Osram Opto Semiconductors GmbH of Regensburg, Germany says it has demonstrated world-record brightness values of over 300 lm with a red 1mm² chip using its latest InGAlP thin-film technology. Furthermore, the company has also reported major advances in the brightness of its green LED chip.

With a wavelength of 615 nm, the red chip achieves more than 300 lm from an operating current of 2 A, and 52 lm/W efficiency at a power consumption of 6 W. Compared with Osram’s current red Platinum Dragon LED, with its output of 96 lm from a consumption of 2.5 W (a luminous efficacy of 38 lm/W), this latest development is a considerable step forward.

“We have achieved this enormous increase in brightness above all by designing the new chips to handle higher currents. This has resulted from optimizing the series resistors”, said Dr. Ralph Wirth, development engineer at Osram Opto Semiconductors.

Designed primarily for projection applications, the chips will be used in Osram’s Dragon and Ostar LEDs, and are expected to be in series production by the middle of 2008.

Higher current handling capacity gives this chip prototype of the next generation a boost in brightness. Photo: Osram

And the green . . .

Based on its ThinGaN technology, Osram’s new 1 mm², 527 nm wavelength green chip has achieved brightness values exceeding 180 lm from an operating current of 1 A, under laboratory conditions. From 350 mA the chip produces 100 lm and consumes 1.4 W (72 lm/W). In comparison, Osram’s current green Platinum Dragon LED would need an operating current of 1 A to produce 100 lm.

Osram credits the increase in output to a new epitaxial process and improved chip design.

Designed as light sources for LCD backlighting applications, the new high-intensity green chips will be used in Osram's Dragon and Ostar LEDs, and are expected to go into series production by the middle of 2008.

A new epitaxial process and improved chip design gives Osram's next generation green chip a major boost in efficiency. Photo: Osram

See related items:

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Rohm’s PicoLED-eco halves energy consumption

Avago launches low-power, through-hole HB-LEDs for portable outdoor signs

Opto product round-up: Avago