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7 results on '"Zinterl, Ernst"'

1. Improvement of light extraction from high-power flip-chip light-emitting diodes by femtosecond laser direct structuring of the sapphire backside surface.

Author

Kuna, Ladislav, Haase, Anja, Sommer, Christian, Zinterl, Ernst, Krenn, Joachim R., Wenzl, Franz P., Pachler, Peter, Hartmann, Paul, Tasch, Stefan, and Leising, Günther

Subjects
LIGHT emitting diodes, ULTRASHORT laser pulses, SAPPHIRES, SUBSTRATES (Materials science), QUANTUM efficiency, LASER ablation
Abstract

We report on the structuring of the backside surface of sapphire substrates in high-power flip-chip light-emitting diodes (LEDs) by femtosecond laser direct writing. Varying the laser powers has been found to affect the sizes of the inscribed patterns on a submicron scale which facilitates the control of the structure sizes with high precision. Accordingly, since on the one hand the light extraction efficiency reveals a strong dependence on pattern sizes, and on the other hand, femtosecond laser structuring provides a simple opportunity to inscribe diverse structures along the LED surfaces, LEDs with laterally controlled light extraction efficiencies can be fabricated. [ABSTRACT FROM AUTHOR]

Published
2008
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2. Novel solutions toward improved high power white LED light source

Author

Wenzl, Franz P., primary, Sommer, Christian, additional, Kuna, Ladislav, additional, Zinterl, Ernst, additional, Krenn, Joachim R., additional, Hartmann, Paul, additional, Pachler, Peter, additional, Schweighart, Marko, additional, Tasch, Stefan, additional, and Leising, Günther, additional

Published
2008
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3. Novel approaches for light control of high power LEDs

Author

Kuna, Ladislav, primary, Wenzl, Franz P., additional, Sommer, Christian, additional, Haase, Anja, additional, Zinterl, Ernst, additional, Krenn, Joachim R., additional, Hartmann, Paul, additional, Pachler, Peter, additional, Schweighart, Marko, additional, Tasch, Stefan, additional, and Leising, Günther, additional

Published
2008
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