C
Christopher Kölper
Researcher at Osram Opto Semiconductors GmbH
Publications - 13
Citations - 222
Christopher Kölper is an academic researcher from Osram Opto Semiconductors GmbH. The author has contributed to research in topics: Nanorod & Metalorganic vapour phase epitaxy. The author has an hindex of 6, co-authored 13 publications receiving 211 citations. Previous affiliations of Christopher Kölper include University of Kassel.
Papers
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Journal ArticleDOI
Group III nitride core–shell nano‐ and microrods for optoelectronic applications
Martin Mandl,Martin Mandl,Xue Wang,Tilman Schimpke,Christopher Kölper,Michael Binder,Johannes Ledig,Andreas Waag,Xiang Kong,Achim Trampert,Frank Bertram,Jürgen Christen,F. Barbagini,Enrique Calleja,Martin Strassburg +14 more
TL;DR: In this paper, the most recent activities on the growth and processing of NAMs exhibiting a core-shell geometry, i.e., structures which consist of an active region shell layer wrapped around a 3D core, which allow for an enormous increase in active area compared to planar technology.
Journal ArticleDOI
Core–shell InGaN nanorod light emitting diodes: Electronic and optical device properties
Christopher Kölper,Christopher Kölper,Matthias Sabathil,Friedhard Römer,Martin Mandl,Martin Strassburg,Bernd Witzigmann +6 more
TL;DR: In this paper, the authors investigated both electronic and optical properties of core-shell InGaN nanorods (NRs) for light emitting diodes (LEDs), and showed that the absence of piezoelectric fields on these nonpolar facets results in strong reabsorption of the emitted photons.
Journal ArticleDOI
All-InGaN Phosphorless White Light Emitting Diodes: An Efficiency Estimation
TL;DR: In this article, the efficiency of monolithic white light emitting diodes (LEDs) that are free of wavelength-converting phosphors and are based solely on the InGaN material system was investigated.
Proceedings ArticleDOI
Luminescence and efficiency optimization of InGaN/GaN core-shell nanowire LEDs by numerical modelling
Friedhard Römer,Marcus Deppner,Zhelio Andreev,Christopher Kölper,Matthias Sabathil,Martin Strassburg,Johannes Ledig,Shunfeng Li,Andreas Waag,Bernd Witzigmann +9 more
TL;DR: In this paper, the authors present a computational study on the anisotropic luminescence and the efficiency of a core-shell type nanowire LED based on GaN with InGaN active quantum wells.
Proceedings ArticleDOI
Optical properties of individual GaN nanorods for light emitting diodes: influence of geometry, materials, and facets
Christopher Kölper,Christopher Kölper,Matthias Sabathil,Bernd Witzigmann,Friedhard Römer,Werner Bergbauer,Martin Strassburg +6 more
TL;DR: In this paper, the optical properties of GaN nanorods for the application in Light Emitting Diodes (LEDs) are analyzed. But the focus is on NR emitters incorporating active layers in the form of quantumdisc or core-shell geometries.