Hyperbranched poly(ethers) containing carbazole or hydrazone groups have been synthesized and investigated using absorption and luminescence spectroscopy. Purple-blue and greenish-blue fluorescence has been recorded for both polymer systems in tetrahydrofuran solution. Their spectral properties strongly depend on the monomer to initiator ratio and the kind of end groups.
New polyethers have been obtained in the anionic polymerization of oxiranes containing carbazole andlor hydrazone groups
in the substituent. Excitation and luminescence spectra of the novel polymers were measured in powder and in
tetrahydrofuran solution. It allowed to conclude that in the absence of excimer trapping sites, only intermolecular energy
migration will be encouraged in dilute solutions of the polymers. Some polyethers and their solutions in tetrahydrofuran
showed blue fluorescence. That would have an application to electroluminescent materials, such as electroluminescence
polymer diodes.
Most photorefractive (PR) materials require plasticizers in order to decrease the glass transition temperature, allowing for orientational enhancement by the chromophores. Introduction of the plasticizer, however, alters not only the viscosity but also the photoconductive properties of the material. This can be shown by comparing two different plasticizers which were introduced into a bifunctional low-molecular-weight PR glass and into a polyfluorene guest-host polymer. The latter reaches response times down to 600 microsecond(s) at a writing intensity of 1 W/cm2. We have recently improved the concept of low-molecular-weight PR glasses. A suitable, photoconducting unit allows the synthesis of a bifunctional system with a glass transition of 22.6 degree(s)C. Therefore, no plasticizer is needed. The material is based on a triphenyldiamine (TPD) moiety to which a nonlinear-optical chromophore is directly attached. The system is the first representative of a whole class of TPD molecules and polymers for photorefractive applications.
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