Advances in Ultra-high Brightness LEDs by Pira International Ltd PDF

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Extra info for Advances in Ultra-high Brightness LEDs

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For AlGaInP chips, in spite of the complexity of transparent substrates (since wafer bonding with exact crystallographic alignment has to be achieved in their case), such transparent substrates are being used, and provides for the delivery of higher luminous flux, compared with devices grown on absorbing substrates. Page 23 © Copyright Pira International Ltd 2007 Advances in Ultra-high Brightness LEDs Comparison between different types of high-power LEDs System efficiency The performance of high-power LEDs can be evaluated in terms of the system efficiency, affordability, quality of light, lifetime and reliability.

At 1,500 mA, the light output is 140 lm but the efficacy is significantly lower at 24 lm/W. Philips Lumileds has announced a chip-level solution for this that was implemented in its commercial Luxeon LED products this year. The new technology, relating to the epitaxial growth of the LED layer structures, enables efficacy values that remain high as the drive current increases. This will enable future commercial power LEDs to retain high efficacy at high drive currents of 1,000 mA and above. Philips Lumileds is therefore confident of introducing the industry’s first high-power LEDs that deliver 70 or more lumens per watt at drive currents of 1,000 mA and higher.

Com The company offers MW-LED light engines for lighting and Illumination applications, including high power entertainment, architectural and other niche lighting; displays and projection, including backlighting; medical and dental, surgical illumination, photo dynamic therapy, curing of dental composites; forensic sciences, UV adhesive curing, materials and food processing industries and non destructive testing. com Page 35 © Copyright Pira International Ltd 2007 Advances in Ultra-high Brightness LEDs Selected manufacturers Under GE Consumer & Industrial's LED business, the company produces the VIO high– power white LED from Lumination, LLC, a subsidiary.

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Advances in Ultra-high Brightness LEDs by Pira International Ltd


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