In the lab, OSRAM tested that the green chip emits 180 lumens of light at 1A, and the red chip has a lumen flux of more than 300 lumens at 2A.
Figure 1 - Green Chip
OSRAM Opto Semiconductors has released laboratory records for ThinGaN green emitters and AlGaInP red emitter chips. The company expects that the first batch of LEDs using these chips will be available for mass production in mid-2008.
The efficiency of the green chip, using OSRAM's ThinGaN technology, has been greatly improved by using new epitaxial growth techniques (metal deposition), and the chip design has also been improved.
The green illuminator (527 nm wavelength) chip has an output of 180 lumens at a current of 1 square millimeter (see Figure 1). When operating at 350mA, the chip produces 100 lumens and consumes 1.4W (equivalent to 72 lumens/W).
In contrast, a green Platinum Dragon LED using conventional chip technology requires 1A of current to output 100 lumens.
By next year, the chip will be used on the Dragon and Ostar series of LEDs, targeting LCD backlighting applications. The output capability is stronger, and the number of LEDs required for large-screen backlights is reduced.
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