Dr. Johannes Gierschner


Current Address:

Dr. Johannes Gierschner
Laboratory for Chemistry of Novel Materials.
Materia Nova R+D Center. Parc Initialis.
Place du Parc 20; B-7000 Mons (BELGIUM).

Phone: + 32(0)65 37 38 67
Fax: + 32(0)65 37 38 61
Email: johannes@averell.umh.ac.be


 


Research Publications Projects

Research Activities

Research areas:

Absorption and fluorescence of ?-conjugated organic molecules - vibronic coupling, solvent shifts and inhomogeneous broadening
Photophysical properties and molecular interactions in perhydrotriphenylene host-guest compounds
Model compounds for intermolecular interactions: covalently linked dimers
Photophysical and optical properties of ?-conjugated organic molecules in the solid state: films nanoparticles, single crystals
Size determination of suspended nanoparticles by dynamic and static light scattering measurements

Materials:

Polyene-like Molecules: Oligophenylenevinylenes, Oligothiophenes, Oligophenylenes

Methods:
UV/Vis-spectroscopy (polarized, angular-resolved)
Fluorescence spectroscopy (time-resolved, polarized)
Light-scattering measurements (dynamic, static, angular-resolved polarized)
Quantum chemical calculations (in collaboration with PD Dr. Hans-Georg Mack)
Theoretical modelling (solvent shifts, inhomogeneous broadening, intermolecular interactions)

Publications:

1)      D. Oelkrug, H.-J. Egelhaaf, J. Gierschner, A. Tompert, "Electronic Deactivation in Single Chains, Nano-Aggregates and Ultrathin Films of Conjugated Oligomers", Synth. Met. 76 (1996) 249-253 

2)      H.-J. Egelhaaf, J. Gierschner, D. Oelkrug, "Characterization of Oriented Oligo- (phenylenevinylene) Films and Nano-Aggregates by UV/Vis-Absorption and Fluorescence Spectroscopy", Synth. Met. 83 (1996) 221-226 

3)      J. Gierschner, H.-J. Egelhaaf, D. Oelkrug, "Absorption, Fluorescence and Light Scattering of Oligothiophene and Oligophenylenevinylene Nanoaggregates", Synth. Met. 84 (1997) 529-530 

4)      D. Oelkrug, A. Tompert, J. Gierschner, H.-J. Egelhaaf, M. Hanack, M. Hohloch, E. Steinhuber, "Tuning of Fluorescence Yields in Films and Nanoparticles of Oligophenylenevinylenes", J. Phys. Chem. B 102 (1998) 1902-1907 

5)      J. Gierschner, H.-J. Egelhaaf, D. Oelkrug, K. Müllen "Electronic Deactivation and Energy Transfer in Doped Oligophenylenevinylene Nanoparticles", J. Fluorescence 8 (1998) 37-44 

6)      H.-J. Egelhaaf, J. Haiber, J. Gierschner, D. Oelkrug, "Optical Constants of Highly Oriented Oligothiophene Films and Nanoparticles", Opt. Mater. 12 (1999) 395-401 

7)      D. Oelkrug, H.-J. Egelhaaf, B. Lehr, J. Gierschner, L. Lüer, P. Matousek, M. Towrie, "Photoinduced Absorption of Thin Oligo(phenylenvinylene Films", Tech. Rep. - Counc. Cent. Lab. Res. Counc. (1999) 

8)      J. Gierschner, L. Lüer, D. Oelkrug, E. Musluolu, B. Behnisch, M. Hanack, "Preparation and Optical Properties of Oligophenylenevinylene/Perhydrotriphenylene Inclusion Compounds", Adv. Mater. 12 (2000) 757-761 

9)      J. Gierschner, "Zum Einfluß intermolekularer Wechselwirkungen auf die Photophysik in Filmen und Nanopartikeln p-konjugierter organischer Moleküle - Optische Spektroskopie an Oligophenylenvinylenen", Verlag Köhler, Tübingen 2000 (ISBN 3-932694-76-7) 

10)    J. Gierschner, L. Lüer, D. Oelkrug, E. Musluolu, B. Behnisch, M. Hanack, "One Dimensional Coupling of Oligophenylenevinylenes in Perhydrotriphenylene Matrices", Synth. Met. 121 (2001) 1695-1696 

11)    D. Oelkrug, J. Gierschner, H.-J. Egelhaaf, L. Lüer, A. Tompert, K. Müllen, U. Stalmach, H. Meier, "Evolution of Optical Absorption from Small Oligomers to Ideally Conjugated PPV and MEH-PPV Oligomers, Synth. Met. 121 (2001) 1693-1694 

12)    K.-H. Schweikhart, M. Hohloch, E. Steinhuber, M. Hanack, L. Lüer, J. Gierschner, H.-J. Egelhaaf, D. Oelkrug, "Highly Luminescent Oligo(phenylenevinylene) Films: The stereochemical Approach", Synth. Met. 121 (2001) 1641-1642 

13)    H.-J. Egelhaaf, J. Gierschner, D. Oelkrug, "Polarizability Effects and Energy Transfer in Quinquethiophene Doped Bithiophene and OPV Films", Synth. Met. 127 (2002) 221-227 

14)    J. Gierschner, H.-G. Mack, L. Lüer, D. Oelkrug, "Fluorescence and Absorption Spectra of Oligophenylenevinylenes: Vibronic Analysis, Band Shapes and Solvatochromism", J. Chem. Phys. 116 (2002) 8596-8609 

15) J. Gierschner, H.-G. Mack, H.-J. Egelhaaf, S. Schweizer, B. Doser, D. Oelkrug, "Optical Spectra of Oligothiophenes: Vibronic States, Torsional Motions, and Solvent Shifts", Synth. Met. 138 (2003) 311-315

16) J. Gierschner, H.-J. Egelhaaf, H.-G. Mack, D. Oelkrug, R. Martinez Alvarez, M. Hanack, "Luminescence of Molecules Confined in Nanochannels", Synth. Met. 137 (2003) 1449-1450

17) J. Gierschner, H.-G. Mack, D. Oelkrug, I. Waldner, H. Rau, "Modeling of the Optical Properties of Cofacial Chromophore Pairs: Stilbenophane", J. Phys. Chem. A 108 (2004) 257-263

18) J. Gierschner, D. Oelkrug, "Optical Properties of Oligophenylenevinylenes" in H. S. Nalwa (Ed.), "Encyclopedia of Nanoscience and Nanotechnology", Vol. 8, American Scientific Publishers (2004) 219-238

19) J.C. Sancho-García, L. Poulsen, J. Gierschner, R. Martínez-Alvárez, E. Hennebicq, M. Hanack, H.-J. Egelhaaf, D. Oelkrug, D. Beljonne, J.L. Brédas, J. Cornil, "Theoretical Characterization and Design of End-substituted Distyrylbenzenes as Excitation Shuttles in One-dimensional Channels", Adv. Mater 16 (2004) 1193-1197

20) J. Gierschner, H.-J. Egelhaaf, D. Oelkrug, S. Botchway, A. W. Parker, "Time-resolved Fluorescence Spectroscopy on Single Oligophenylenevinylene Nanoparticles", Tech. Rep. - Counc. Cent. Lab. Res. Counc., in print

21) G. Heimel, M. Daghofer, J. Gierschner, E. J. W. List, A. C. Grimsdale, K. Müllen, D. Beljonne, J.-L. Brédas, E. Zojer, "Breakdown of the Mirror Image Symmetry in the Optical Absorption/Emisssion Spectra of Oligo(para-phenylenes)", submitted to J. Chem. Phys.

Research Projects

Research Training Network "Molecules in Nanochannels - Synthesis, Spectroscopy, and Application"
Funding: European Union
Coordinators: Dr. Hans-Joachim Egelhaaf and Dr. Johannes Gierschner
Open Positions  available!