Department of Chemistry, The University of Hong Kong
Multi-photon excitation allows molecules that typically absorb in the ultraviolet region to be excited with red or near-infrared light. The photoluminescence processes from organic-lanthanide complexes are usually induced by an organic chromophore ligand that absorbs incoming light and transfers the excitation energy to the lanthanide ion. Until now, only a few multi-photon processes in organic lanthanide complexes have been observed owing to the limitations of experimental measurements. Although there have been reports on lanthanide complexes containing second harmonic generation; these have been limited and focused just on glassy doped lanthanide materials. We have developed some amide based polymeric lanthanide materials that displayed efficient photo upconversion and/or non-linear optical properties (SHG, THG). Their syntheses, structures and luminescent properties will be discussed.
1.K.-L. Wong, W.-M. Kwok, W.-T. Wong, D.L. Phillips, K.-W. Cheah, Angewandte Chemie International Edition, 2004, 43, 4659-4662.
2. K.-L. Wong, G.-L. Law, W.-M. Kwok, W.-T. Wong, and D. L. Phillips. Angewandt Chemie International Edition, 2005, 44, 3436-3439.
3. K.-L. Wong, Y.-Y. Yang, G.-L. Law and W.-T. Wong, Advanced Materials, 2006 , 18, 1051-1054.