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DI Dr. Christian Sommer

Role

Head of research group

Research group

MATERIALS:

Light and Optical Technologies

Phone number

+43 316 876-3201

E-mail

Christian.Sommer@joanneum.at

Address

Franz-Pichler-Straße 30, 8160, Weiz
+43 316 876-3000
materials@joanneum.at

Publications

Materials
2024

Low-temperature preparation of nanostructured porous sol-gel anti-reflective coating for near-infrared wavelengths

Authors Hayati-Roodbari Nastaran, Chwatal Simon, Jakopic Georg, Nemitz Wolfgang, Lichtenegger Philip, Reil Frank, Melchior Philipp, Trattnig Roman, Sommer, Christian
Low-temperature preparation of nanostructured porous sol-gel anti-reflective coating for near-infrared wavelengths
Materials
2024

Femtosecond laser written waveguides in sapphire for visible light delivery

Authors Winkler, Sarah, Joachim R Krenn, Jakob Wahl, Alexander Zesar, Yves Colombe, Klemens Schuppert, Clemens Rossler, Christian Sommer, Philipp Hurdax, Philip Lichtenegger and Bernhard Lamprecht
Femtosecond laser written waveguides in sapphire for visible light delivery
Materials
2023

The impact of plasmonic electrodes on the photocarrier extraction of inverted organic bulk heterojunction solar cells

Authors Florian Kolb, Mirella El Gemayel, Imran Khan, Jakub Dostalek, Roman Trattnig, Christian Sommer & Emil J. W. List-Kratochvil
The impact of plasmonic electrodes on the photocarrier extraction of inverted organic bulk heterojunction solar cells
Materials
2022

A combined optical-electronic simulation approach for a comprehensive discussion of the performance of visible light positioning under tunable lighting conditions

Authors Zahiri-Rad, Saman; Lichtenegger, Felix; Leiner, Claude; Weiss, Andreas Peter; Sommer, Christian; Leitgeb, Erich
A combined optical-electronic simulation approach for a comprehensive discussion of the performance of visible light positioning under tunable lighting conditions
Materials
2022

Compact angle diversity receiver concept for visible light positioning

Authors Lichtenegger, Felix; Leiner, Claude; Sommer, Christian; Weiss, Andreas; Kröpfl, Andreas; Zahiri-Rad, Saman
Compact angle diversity receiver concept for visible light positioning
Materials
2022

Origination of free-form micro-optical elements using one- andtwo-photon grayscale laser lithography

Authors Lamprecht, Bernhard; Ulm, Andreas; Lichtenegger, Philip; Leiner, Claude; Nemitz, Wolfgang; Sommer, Christian
Origination of free-form micro-optical elements using one- andtwo-photon grayscale laser lithography
Materials
2022

Light guidance film for bifacial photovoltaic modules

Authors Zauner, Markus; Muehleisen, Wolfgang; Holzmann, Dominik; Baumgart, Marcus; Oreski, Gernot; Feldbacher, Sonja; Feichtner, Markus; Nemitz, Wolfgang; Leiner, Claude; Sommer, Christian; Reil, Frank
Light guidance film for bifacial photovoltaic modules
Materials
2022

Multipitched plasmonic nanoparticle grating for broadband light enhancement in white light-emitting organic diodes

Authors Auer-Berger, Manuel; Tretnak, Veronika; Sommer, Christian; Wenzl, Franz-Peter; Krenn, Joachim R.; List-Kratochvil, Emil J. W.
Multipitched plasmonic nanoparticle grating for broadband light enhancement in white light-emitting organic diodes
Materials
2022

Human activity recognition based on fusing inertial sensors with an optical receiver

Authors Salem, Ziad; Lichtenegger, Felix; Weiss, Andreas Peter; Leiner, Claude; Sommer, Christian; Wenzl, Franz-Peter
Human activity recognition based on fusing inertial sensors with an optical receiver
Materials
2022

Combining Optical and Electronic simulation models for the assessment of Visible Light Positioning Systems

Authors Zahiri-Rad, Saman; Weiss, Andreas P.; Wenzl, Franz P.; Lichtenegger, Felix; Leiner, Claude; Sommer, Christian; Leitgeb, Erich
Combining Optical and Electronic simulation models for the assessment of Visible Light Positioning Systems
Materials
2021

Application Example: Freeform micro-optical elements on light management foils for direct-lit applications

Authors Leiner, Claude; Trattnig, Roman; Postl, Markus; Palfinger, Ursula; Neudorfsky, Jürgen; Stacher, Christian; Sommer, Christian
Application Example: Freeform micro-optical elements on light management foils for direct-lit applications
Materials
2019

R2R-UV-nanoimprinting as a powerful mean for large-area fabrication of freeform micro-optical elements

Authors B. Stadlober, C. Leiner, D. Nees, A. Haase, U. Palfinger, L. Kuna, S. Ruttloff, M. Smolka, J. Hesse, M. Sonnleitner, and C. Sommer
R2R-UV-nanoimprinting as a powerful mean for large-area fabrication of freeform micro-optical elements
Materials
2018

Roll-to-Roll UV Nanoimprint Lithography for Large-Area Nano- and Micro-Structuring of Flexible Substrates

Authors Claude Leiner, Stephan Ruttloff, Dieter Nees, Anja Haase, Ladislav Kuna, Wolfgang Nemitz, Franz-Peter Wenzl, Christian Sommer, Barbara Stadlober and Ursula Palfinger, Paul Hartmann
Roll-to-Roll UV Nanoimprint Lithography for Large-Area Nano- and Micro-Structuring of Flexible Substrates
Materials
2013

On the Thermal Load of the Color-Conversion Elements in Phosphor-Based White Light-Emitting Diodes

Authors Fulmek, Paul; Sommer, Christian; Hartmann, Paul; Pachler, Peter; Hoschopf, Hans; Langer, Gregor; Nicolics, Johann; Wenzl, Franz P.
On the Thermal Load of the Color-Conversion Elements in Phosphor-Based White Light-Emitting Diodes
Materials
2013

The impact of the non-linearity of the radiant flux on the thermal load of the color conversion elements in phosphor converted LEDs under different current driving schemes

Authors Wenzl, Franz P.; Sommer, Christian; Hartmann, Paul; Pachler, Peter; Hoschopf, Hans; Langer, Gregor; Fulmek, Paul; Nicolics, Johann
The impact of the non-linearity of the radiant flux on the thermal load of the color conversion elements in phosphor converted LEDs under different current driving schemes
Materials
2012

Femtosecond laser processing as a versatile tool for advanced solid state lighting sources: From efficacy enhancement to colour temperature control

Authors Kuna, Ladislav; Sommer, Christian; Reil, Frank; Krenn, Joachim R.; Hartmann, Paul; Pachler, Peter; Hoschopf, Hans; Wenzl, Franz P.
Femtosecond laser processing as a versatile tool for advanced solid state lighting sources: From efficacy enhancement to colour temperature control
Materials
2012

The phosphor’s optical properties–chromaticity coordinate relationship of phosphor converted white LEDs

Authors Sommer, C.; Hartmann, P.; Pachler, P.; Hoschopf, H.; Wenzl, F. P.
The phosphor’s optical properties–chromaticity coordinate relationship of phosphor converted white LEDs
Materials
2012

White light quality of phosphor converted light-emitting diodes: A phosphor materials perspective of view

Authors Sommer, Christian; Hartmann, Paul; Pachler, Peter; Hoschopf, Hans; Wenzl, Franz P.
White light quality of phosphor converted light-emitting diodes: A phosphor materials perspective of view
Materials
2011

The Impact of Light Scattering on the Radiant Flux of Phosphor-Converted High Power White Light-Emitting Diodes

Authors Sommer, Christian; Reil, Frank; Krenn, Joachim R.; Hartmann, Paul; Pachler, Peter; Hoschopf, Hans; Wenzl, Franz P.
The Impact of Light Scattering on the Radiant Flux of Phosphor-Converted High Power White Light-Emitting Diodes
Materials
2011

On the Adjustment of the Color Temperature of White Light-Emitting Diodes by Femtosecond Laser Patterning

Authors Wenzl, Franz P.; Kuna, Ladislav; Sommer, Christian; Reil, Frank; Krenn, Joachim R.; Pachler, Peter; Hartmann, Paul
On the Adjustment of the Color Temperature of White Light-Emitting Diodes by Femtosecond Laser Patterning
Materials
2010

The Impact of Inhomogeneities in the Phosphor Distribution on the Device Performance of Phosphor-Converted High-Power White LED Light Sources

Authors Sommer, Christian; Reil, Frank; Krenn, Joachim R.; Hartmann, Paul; Pachler, Peter; Tasch, Stefan; Wenzl, Franz P.
The Impact of Inhomogeneities in the Phosphor Distribution on the Device Performance of Phosphor-Converted High-Power White LED Light Sources
Materials
2009

The Effect of the Phosphor Particle Sizes on the Angular Homogeneity of Phosphor-Converted High-Power White LED Light Sources

Authors Sommer, Christian; Krenn, Joachim R.; Hartmann, Paul; Pachler, Peter; Schweighart, Marko; Tasch, Stefan; Wenzl, Franz P.
The Effect of the Phosphor Particle Sizes on the Angular Homogeneity of Phosphor-Converted High-Power White LED Light Sources
Materials
2009

Surface Texturing of High-Power Flip-Chip LEDs by Femtosecond Laser Direct Structuring

Authors Kuna, Ladislav; Haase, Anja; Reil, Frank; Sommer, Christian; Krenn, Joachim R.; Hartmann, Paul; Pachler, Peter; Tasch, Stefan; Wenzl, Franz Peter
Surface Texturing of High-Power Flip-Chip LEDs by Femtosecond Laser Direct Structuring
Materials
2008

Confocal microscopy as a tool for the study of the emission characteristics of high-power LEDs

Authors Kuna, L.; Sommer, C.; Zinterl, E.; Wenzl, F. P.; Pachler, P.; Hartmann, P.; Tasch, S.; Leising, G.
Confocal microscopy as a tool for the study of the emission characteristics of high-power LEDs
Materials
2008

Volume structuring of high power LED encapsulates by femtosecond laser direct writing

Authors Kuna, L.; Sommer, C.; Zinterl, E.; Krenn, J. R.; Pachler, P.; Hartmann, P.; Tasch, S.; Leising, G.; Wenzl, F. P.
Volume structuring of high power LED encapsulates by femtosecond laser direct writing
Materials
2008

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

Authors Kuna, Ladislav; Haase, A.; Sommer, Christian; Zinterl, Ernst; Krenn, Joachim; Wenzl, Franz; Pachler, Peter; Hartmann, Paul; Tasch, Stefan; Leising, Guenther
Improvement of light extraction from high-power flip-chip light-emitting diodes by femtosecond laser direct structuring of the sapphire backside surface
Materials
2008

Tailoring of the Color Conversion Elements in Phosphor-Converted High-Power LEDs by Optical Simulations

Authors Sommer, Christian; Wenzl, Franz-Peter; Hartmann, Paul; Pachler, Peter; Schweighart, Marko; Tasch, Stefan; Leising, GÜnther
Tailoring of the Color Conversion Elements in Phosphor-Converted High-Power LEDs by Optical Simulations
Materials
2007

Low-Voltage Organic Thin-Film Transistors with High-k Nanocomposite Gate Dielectrics for Flexible Electronics and Optothermal Sensors

Authors Zirkl, M.; Haase, A.; Fian, A.; Schön, H.; Sommer, C.; Jakopic, G.; Leising, G.; Stadlober, B.; Graz, I.; Gaar, N.; Schwödiauer, R.; Bauer-Gogonea, S.; Bauer, S.
Low-Voltage Organic Thin-Film Transistors with High-k Nanocomposite Gate Dielectrics for Flexible Electronics and Optothermal Sensors
Materials
2007

Silicate phosphors and white LED technology - Improvements and opportunities - art. no. 66690O

Authors Sommer, Christian; Wenzl, Franz; Hartmann, Paul; Pachler, Peter; Schweighart, Marko; Leising, Guenther; Tasch, Stefan
Silicate phosphors and white LED technology - Improvements and opportunities - art. no. 66690O
Materials
2007

Emission characteristics of high power LEDs studied by confocal microscopy

Authors Kuna, L.; Sommer, C.; Zinterl, E.; Wenzl, F. P.; Pachler, P.; Hartmann, P.; Tasch, S.; Leising, G.
Emission characteristics of high power LEDs studied by confocal microscopy
Materials

Low-temperature preparation of nanostructured porous sol-gel anti-reflective coating for near-infrared wavelengths

Authors Nastaran Hayati-Roodbari,, Simon Chwatal, Georg Jakopic, Wolfgang Nemitz, Philip Lichtenegger, Frank Reil, Philipp Melchior, Roman Trattnig, Christian Sommer
Low-temperature preparation of nanostructured porous sol-gel anti-reflective coating for near-infrared wavelengths
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JOANNEUM RESEARCH provides innovation and technology services in the field of applied research. As a research company working on behalf of various federal provinces and regions in Austria, our expertise shapes the development of our modern society and economy – sustainably, and always with a focus on people. As a multidisciplinary team working in a flexible set-up that fosters innovation, we always live up to the highest social and scientific standards.

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