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Synthesis and opto-electronic properties of cholesteric cellulose esters

Title data

Greiner, Andreas ; Hou, Haoqing ; Reuning, Arndt ; Thomas, Arne ; Wendorff, Joachim H. ; Zimmermann, S.:
Synthesis and opto-electronic properties of cholesteric cellulose esters.
In: Cellulose. Vol. 10 (March 2003) Issue 1 . - pp. 37-52.
ISSN 1572-882X
DOI: https://doi.org/10.1023/A:1023038303103

Official URL: Volltext

Abstract in another language

Cholesteric materials display unique optical properties which can be exploited in opto-electronic applications such as light emitting diodes. The key feature is the position of the wavelength of the emitted light relative to the one of the selective reflection band. We have synthesized a set of cellulose derivatives displaying the cholesteric phase with the aim to investigate the correlation between chemical structure and properties. Phase transition temperatures, the chain packing, the wavelength of selective reflection but also absorption and fluorescence spectra were investigated as a function of the degree of substitution (DS), the nature of lateral substituents, the composition of doped systems and blends of different cellulose derivatives. Investigated were furthermore the degree of circular polarization of the emitted light for guest-host systems and for cellulose systems with chromophores linked by covalent bonds to the cellulose backbone as well as their performance in light emitting diodes. The conclusion is that the optical properties can be accounted for on the basis of the model of a one-dimensional photonic crystal. The limiting factor with respect to opto-electronic applications is the poor control of the uniformity of the helix formation and orientation.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: cholesteric phase; fluorescence; electroluminescence; polarized emission
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 14 Apr 2015 08:26
Last Modified: 15 May 2015 13:35
URI: https://eref.uni-bayreuth.de/id/eprint/9748