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Proceedings Paper

Advanced technologies for high-efficiency GaInN LEDs for solid state lighting
Author(s): Volker Harle; Berthold Hahn; Johannes Baur; Michael Fehrer; Andreas Weimar; Stephan Kaiser; Dominik Eisert; Franz Eberhard; Andreas Plossl; Stefan Bader
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Paper Abstract

Solid state lighting has seen a rapid development over the last decade. They compete and even outperform light sources like incandescent bulbs and halogen lamps. LEDs are used in applications where brightness, power consumption, reliability and costs are key parameters as automotive, mobile and display applications. In the future LEDs will also enter the market of general lighting. For all of these new applications highly efficient, scalable and cost efficient technologies are required. These targets can be matched by SiC based flip chip LEDs which enable the design of high current chips with efficiencies of up to 28 lm/W in white solderable packages. An alternative approach is the implementation of thinfilm technology for GaInN. The LED is fabricated by transferring the epilayers with laser lift off from sapphire to a GaAs host substrate. In combination with efficient surface roughening and highly reflective p-mirror metalization an extraction efficiency of 70% and wall plug efficiency of 24% at 460 nm have been shown. The chips showed 16 mW @ 20 mA with a Voltage of 3.2 V. The technology is scalable from small size LEDs to high current Chips and is being transferred to mass production.

Paper Details

Date Published: 26 January 2004
PDF: 7 pages
Proc. SPIE 5187, Third International Conference on Solid State Lighting, (26 January 2004); doi: 10.1117/12.521358
Show Author Affiliations
Volker Harle, OSRAM Opto Semiconductors GmbH (Germany)
Berthold Hahn, OSRAM Opto Semiconductors GmbH (Germany)
Johannes Baur, OSRAM Opto Semiconductors GmbH (Germany)
Michael Fehrer, OSRAM Opto Semiconductors GmbH (Germany)
Andreas Weimar, OSRAM Opto Semiconductors GmbH (Germany)
Stephan Kaiser, OSRAM Opto Semiconductors GmbH (Germany)
Dominik Eisert, OSRAM Opto Semiconductors GmbH (Germany)
Franz Eberhard, OSRAM Opto Semiconductors GmbH (Germany)
Andreas Plossl, OSRAM Opto Semiconductors GmbH (Germany)
Stefan Bader, OSRAM Opto Semiconductors GmbH (Germany)

Published in SPIE Proceedings Vol. 5187:
Third International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Steven P. DenBaars; John C. Carrano, Editor(s)

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