Topic：Heteroleptic Cationic Iridium(III) Complexes as Nonlinear Absorbing Materials
Speaker： Professor Wenfang Sun
                Department of Chemistry and Biochemistry,
                North Dakota State University, USA

Time：2014/8/28(Thursday)  3:30 pm
Room：Supramolecular Building,  ROOM A401

Bio Information：

EDUCATION
Ph.D. Organic Chemistry, Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing, China, July 1995
Ph.D. Dissertation: Asymmetric Pentaazadentate Porphyrin-like Metal Complexes: Synthesis, Excited-State Properties, and Applications for Optical Limiting and Photodynamic Therapy
B.S. Organic Chemistry, Wuhan University, Wuhan, China, July 1990
PROFESSIONAL  EXPERIENCE
2011 – Present  Professor and Walter F. and Verna Gehrts Professor, Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND
Aug. 2007 – 2011 Associate Professor, Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND
Aug. 2001 – July 2007 Assistant Professor, Department of Chemistry and Molecular Biology, North Dakota State University, Fargo, ND
RESEARCH  INTERESTS
Organic/organometallic nonlinear optical materials
Organic/organometallic light emitting materials
Photosensitizers for photodynamic therapy
Optical sensors

Abstract：

Organic materials with broadband nonlinear absorption in the visible to the near-IR region are desired for a variety of photonic device applications. Ir(III) complexes are promising candidates for these applications due to the weak direct transition from the ground state to the triplet excited state and the broadband excited-state absorption in the visible to the near-IR region. The ease of structural modifications also makes them good candidates for structure-property correlation study. To optimize the reverse saturable absorption (RSA) of Ir(III) complexes, we designed and synthesized several series of heteroleptic cationic Ir(III) complexes with different diimine ligands, different substituents on the cyclometalating ligands and different degrees of -conjugation on the diimine ligand and/or cyclometalating ligands. The photophysical properties of these complexes, including UV-vis absorption, emission, and transient absorption were systematically investigated.

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