Dr. Ralph Wirth Profile

Dr. Ralph Wirth

Chip Development Engineer at ams-OSRAM International GmbH

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Author

Publications (13)

Proceedings Article | 25 September 2014 Paper

Optimization of optical systems for LED spot lights concerning the color uniformity

Anne Teupner, Krister Bergenek, Ralph Wirth, Juan Miñano, Pablo Benítez

Proceedings Volume 9190, 91900J (2014) https://doi.org/10.1117/12.2060849

KEYWORDS: Light sources, Reflectors, Light emitting diodes, Lenses, Optical components, Light scattering, Scattering, Particles, Visualization, Light

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Proceedings Article | 27 February 2014 Paper

Merit function for the evaluation of color uniformity in the far field of LED spot lights

Anne Teupner, Krister Bergenek, Ralph Wirth, Juan Miñano, Pablo Benítez

Proceedings Volume 9003, 900303 (2014) https://doi.org/10.1117/12.2043545

KEYWORDS: Visualization, Light emitting diodes, Lamps, Light sources, Halogens, Optical components, Reflectors, Color difference, Signal to noise ratio, Color vision

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Proceedings Article | 9 February 2011 Paper

Luminescent ceramics for LED conversion

M. Raukas, G. Wei, K. Bergenek, J. Kelso, N. Zink, Y. Zheng, M. Hannah, M. Stough, R. Wirth, A. Linkov, F. Jermann, D. Eisert

Proceedings Volume 7954, 795415 (2011) https://doi.org/10.1117/12.875487

KEYWORDS: Ceramics, Light emitting diodes, Aluminium gallium indium phosphide, Scattering, Light scattering, Semiconductors, External quantum efficiency, Absorption, Indium gallium nitride, Diodes

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Proceedings Article | 18 August 2010 Paper

Concepts for future solid state lighting solutions

N. von Malm, R. Wirth, S. Illek, U. Steegmüller

Proceedings Volume 7784, 778411 (2010) https://doi.org/10.1117/12.864695

KEYWORDS: Light emitting diodes, Lamps, Solid state lighting, Light sources and illumination, Luminous efficacy, Energy efficiency, Light sources, Semiconductors, Absorption, LED lighting

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Proceedings Article | 12 February 2010 Paper

High efficiency green LEDs using II-VI color converters

Thomas Miller, Michael Haase, Xiaoguang Sun, Bing Hao, Junying Zhang, Terry Smith, Todd Ballen, Junqing Xie, Amy Barnes, Fedja Kecman, Joseph Yang, James Thielen, Catherine Leatherdale, Ralph Wirth, Andreas Biebersdorf, Karl Engl, Stefan Groetsch

Proceedings Volume 7617, 76171A (2010) https://doi.org/10.1117/12.853330

KEYWORDS: Light emitting diodes, Green light emitting diodes, Quantum wells, Semiconducting wafers, Temperature metrology, Gallium nitride, Glasses, Group II-VI semiconductors, Luminescence, Blue light emitting diodes

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Proceedings Article | 3 February 2009 Paper

Beam-shaping properties of InGaN thin-film micro-cavity light-emitting diodes with photonic crystals

K. Bergenek, Ch. Wiesmann, H. Zull, C. Rumbolz, R. Wirth, N. Linder, K. Streubel, T. Krauss

Proceedings Volume 7231, 72310C (2009) https://doi.org/10.1117/12.807617

KEYWORDS: Light emitting diodes, Diffraction, Gallium nitride, Photonic crystals, Thin films, Indium gallium nitride, Mirrors, Waveguides, Absorption, Reflectivity

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Proceedings Article | 25 October 2005 Paper

Fast LEDs for polymer optical fiber communication at 650nm

R. Wirth, B. Mayer, S. Kugler, K. Streubel

Proceedings Volume 6013, 60130F (2005) https://doi.org/10.1117/12.632780

KEYWORDS: Light emitting diodes, Phase only filters, Transparent conductors, Polymer optical fibers, Modulation, Quantum wells, Aluminum, Aluminium gallium indium phosphide, Vertical cavity surface emitting lasers, Oxidation

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Proceedings Article | 20 December 2004 Paper

High-brightness red-emitting AlGaInP thin-film RCLEDs

Reto Joray, Marc Ilegems, Ross Stanley, Wolfgang Schmid, Rainer Butendeich, Ralph Wirth, Arndt Jaeger, Klaus Streubel

Proceedings Volume 5594, (2004) https://doi.org/10.1117/12.579495

KEYWORDS: Thin films, External quantum efficiency, Light emitting diodes, Aluminium gallium indium phosphide, Reflectors, Semiconductors, Waveguides, Quantum wells, Absorption, Interfaces

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Proceedings Article | 21 June 2004 Paper

InGaAlP thin film LEDs with high luminous efficiency

Reiner Windisch, Paola Altieri, Rainer Butendeich, Stefan Illek, Peter Stauss, Wilhelm Stein, Walter Wegleiter, Ralph Wirth, Heribert Zull, Klaus Streubel

Proceedings Volume 5366, (2004) https://doi.org/10.1117/12.528938

KEYWORDS: Light emitting diodes, Internal quantum efficiency, Quantum efficiency, External quantum efficiency, Luminous efficiency, Aluminium gallium indium phosphide, Ray tracing, Absorption, Semiconducting wafers, Reflectivity

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Proceedings Article | 3 July 2003 Paper

Scalability of buried microreflector light-emitting diodes for high-current applications

Stefan Illek, Ines Pietzonka, Andreas Ploessl, Peter Stauss, Walter Wegleiter, Reiner Windisch, Ralph Wirth, Heribert Zull, Klaus Streubel

Proceedings Volume 4996, (2003) https://doi.org/10.1117/12.476550

KEYWORDS: Light emitting diodes, Semiconducting wafers, Metals, Mirrors, Semiconductors, Aluminium gallium indium phosphide, Thin films, Gallium arsenide, Reflection, Absorption

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Proceedings Article | 3 July 2003 Paper

Recent progress of AlGaInP thin-film light-emitting diodes

Ralph Wirth, Stefan Illek, Christian Karnutsch, Ines Pietzonka, Andreas Ploessl, Peter Stauss, Wilhelm Stein, Walter Wegleiter, Reiner Windisch, Heribert Zull, Klaus Streubel

Proceedings Volume 4996, (2003) https://doi.org/10.1117/12.476582

KEYWORDS: Light emitting diodes, Mirrors, Thin films, Reflectivity, Semiconducting wafers, Absorption, Semiconductors, Gold, Aluminium gallium indium phosphide, Dielectrics

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Proceedings Article | 14 May 2001 Paper

Red and orange resonant-cavity LEDs

Ralph Wirth, Christian Karnutsch, Siegmar Kugler, Simone Thaler, Klaus Streubel

Proceedings Volume 4278, (2001) https://doi.org/10.1117/12.426855

KEYWORDS: Mirrors, Light emitting diodes, Quantum wells, Reflectivity, Aluminium gallium indium phosphide, Epoxies, Aluminum, Gallium, Fabry–Perot interferometers, Absorption

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Proceedings Article | 14 May 2001 Paper

High-brightness AlGaInP light-emitting diodes using surface texturing

Norbert Linder, Siegmar Kugler, Peter Stauss, Klaus Streubel, Ralph Wirth, Heribert Zull

Proceedings Volume 4278, (2001) https://doi.org/10.1117/12.426852

KEYWORDS: Light emitting diodes, Luminous efficiency, Reflection, Aluminium gallium indium phosphide, Absorption, Semiconductors, Light sources and illumination, Gallium arsenide, Internal quantum efficiency, Standards development

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Showing 5 of 13 publications

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