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17 results on '"Einfeldt, Sven"'

1. Defects, performance, and reliability in UVC LEDs

Author

Kim, Jong Kyu, Krames, Michael R., Strassburg, Martin, Meneghini, Matteo, Roccato, Nicola, Piva, Francesco, Pilati, Marco, De Santi, Carlo, Buffolo, Matteo, Susilo, Norman, Hauer Vidal, David, Muhin, Anton, Sulmoni, Luca, Ruschel, Jan, Glaab, Johannes, Rass, Jens, Einfeldt, Sven, Wernicke, Tim, Kneissl, Michael, Meneghesso, Gaudenzio, and Zanoni, Enrico

Published
2024
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2. UV LED reliability: degradation mechanisms and challenges

Author

Fujioka, Hiroshi, Morkoç, Hadis, Schwarz, Ulrich T., Meneghini, Matteo, Piva, Francesco, De Santi, Carlo, Trivellin, Nicola, Buffolo, Matteo, Roccato, Nicola, Brescancin, Riccardo, Grigoletto, Massimo, Fiorimonte, Davide, Einfeldt, Sven, Glaab, Johannes, Ruschel, Jan, Susilo, Norman, Wernicke, Tim, Kneissl, Michael, Meneghesso, Gaudenzio, and Zanoni, Enrico

Published
2022
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6. Thermocompression bonding for high-power-UV LEDs

Author

Kim, Jong Kyu, Krames, Michael R., Strassburg, Martin, Tu, Li-Wei, Kaepplinger, Indira, Karolewski, Dominik, Brockmann, Geert, Ortlepp, Thomas, Brodersen, Olaf, Thies, Andreas, Rass, Jens, Einfeldt, Sven, Lobo-Ploch, Neysha, Stoelmacker, Christoph, and Schnieder, Frank

Published
2018
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9. MOVPE growth for UV-LEDs.

Author

Knauer, Arne, Brunner, Frank, Kolbe, Tim, Küller, Viola, Rodriguez, Hernan, Einfeldt, Sven, Weyers, Markus, and Kneissl, Michael

Published
2009
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10. UV LED reliability: degradation mechanisms and challenges.

Author

Meneghini, Matteo, Piva, Francesco, De Santi, Carlo, Trivellin, Nicola, Buffolo, Matteo, Roccato, Nicola, Brescancin, Riccardo, Grigoletto, Massimo, Fiorimonte, Davide, Einfeldt, Sven, Glaab, Johannes, Ruschel, Jan, Susilo, Norman, Wernicke, Tim, Kneissl, Michael, Meneghesso, Gaudenzio, and Zanoni, Enrico

Published
2021
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14. Current spreading in UV-C LEDs emitting at 235 nm

Author

Chyi, Jen-Inn, Fujioka, Hiroshi, Morkoç, Hadis, Lapeyrade, Mickael, Eberspach, Florian, Glaab, Johannes, Lobo-Ploch, Neysha, Reich, Christoph, Kuhn, Christian, Guttmann, Martin, Wernicke, Tim, Mehnke, Frank, Einfeldt, Sven, Knauer, Arne, Weyers, Markus, and Kneissl, Michael

Published
2015
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15. High-power UV-B LEDs with long lifetime

Author

Chyi, Jen-Inn, Fujioka, Hiroshi, Morkoç, Hadis, Rass, Jens, Kolbe, Tim, Lobo-Ploch, Neysha, Wernicke, Tim, Mehnke, Frank, Kuhn, Christian, Enslin, Johannes, Guttmann, Martin, Reich, Christoph, Mogilatenko, Anna, Glaab, Johannes, Stoelmacker, Christoph, Lapeyrade, Mickael, Einfeldt, Sven, Weyers, Markus, and Kneissl, Michael

Published
2015
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17. Optical polarization of UV-A and UV-B (In)(Al)GaN multiple quantum well light-emitting diodes

Author

Kolbe, Tim, Knauer, Arne, Stellmach, Joachim, Chua, Chris, Yang, Zhihong, Einfeldt, Sven, Vogt, Patrick, Johnson, Noble M., Weyers, Markus, and Kneissl, Michael

Abstract

The optical polarization of the in-plane emission of c-plane oriented (In)(Al)GaN multiple quantum well light emitting diodes in the spectral range from 288 nm to 386 nm has been investigated by electroluminescence measurements. The intensity of transverse-electric polarized light relative to the transverse-magnetic polarized light decreases with decreasing emission wavelength. This effect is attributed to the different electronic band structures in the active region of the light emitting diodes. A changing aluminum and indium mole fraction in the (In)(Al)GaN quantum wells results in a rearrangement of the valence bands at the -point of the Brillouin zone. For shorter wavelengths the crystal-field splitoff hole band moves closer to the conduction band relative to the heavy and light hole bands and as a consequence the transverse-magnetic polarized emission increases. Moreover, the in-plane polarization is shown to depend on the injection current. The correlation between the in-plane polarization and the injection current has been found to be different for light emitting diodes with InGaN and (In)AlGaN multiple quantum wells. The results highlight that polarization effects need to be considered when optimizing the light extraction from ultraviolet light emitting diodes in the (In)AlGaN materials system.

Published
2011
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