学术报告

报告一

题  目：Phosphorus-based emitters for OLEDs

报告人：Prof. Muriel Hissler

        Universitéde Rennes1, Institut des Sciences Chimiques de Rennes France

时  间：2015年4月23日(星期四) 14:00

地  点：化学楼三楼报告厅

摘  要：π-Conjugated oligomers and polymers based on aromatic heterocyclopentadienes have attracted strong interest in recent years owing to their potential applications for electronic devices (light emitting diodes, thin film transistors, photovoltaïc cells...). Recently, we have showed that the phosphole ring, a five-membered ring incorporating a phosphorus atom, is an appealing building block for the construction of π-conjugated systems due to its low aromatic character, the versatile reactivity of its P-centre and the presence of a σπconjugation. We have also investigated the physical properties of chromophores incorporating 1,2-dihydrophosphete, a four-membered unsaturated cycle incorporating a phosphorus atom. On one side oligomers containing phosphole and
thiophene rings possess low
 HOMO-LUMO gaps and on the
 other side oligomers containing 
1,2-dihydrophosphete and fluorenyl
 substituents possess high 
HOMO-LUMO gap. Their optical
and electrochemical properties can
 be tuned either via chemical modifications involving the phosphorus atom (Y = AuCl, S...) or by changing the nature of substituants on different positions of the heterocycles. The physical properties of these compounds make them valuable building blocks for the development of material for OLEDs and dopant for white OLEDs in a complementary color approach. These results show the high potential of organophosphorus derivatives for the tailoring of π-conjugated materials.

 

报告二

题  目：Molecular switches with organometallic carbon-rich complexes

报告人：Prof. Stephane Rigaut

        Universitéde Rennes1, Institut des Sciences Chimiques de Rennes France

时  间：2015年4月23日(星期四) 15:00

地  点：化学楼三楼报告厅

摘  要：Carbon-rich ruthenium complexes have been involved in the building of original redox-active molecular wires and junctions, owing to their excellent ability to promote a strong electronic coupling between the metal centers and the conjugated ligands. Combinations of such metal complexes with carefully chosen functional units also lead to original properties valuable to achieve functional materials that present effective switching behaviors. For example, the ruthenium(II) carbon-rich moiety is an efficient sensitizer to promote ytterbium luminescence, and further commutation of this near-IR emission is achieved by changing the oxidation state of this antenna. Also, the perturbation of a dithienylethene (DTE) system with ruthenium moieties affords materials that gather efficient and suitable photo/electrochromism to achieve unique switchable multifunctional nanodevices.