Prof. W.K. Chan　　　陳偉鍵教授

B.Sc., C.U.H.K.;
M.Sc., Ph.D. Chicago

Office:

Room 403
Chong Yuet Ming Chemistry Building
The University of Hong Kong
Pokfulam Road
Hong Kong

We have developed a series of metal-containing polymers that exhibit interesting electronic and photonic properties. For examples, a-diimine complexes of different transition metals have been incorporated into different polymer systems such as poly(p-phenylene)s, poly(p-phenylenevinylene)s, polyamides, poly(benzobisoxazole)s, poly(benzobisthiazoles), and polyimides etc. It was found that the metal complexes played very important roles in photosensitization and light emission processes. They can be fabricated into organic photovoltaic cells with power conversion efficiency of approximately 0.5%.

The balance of charge injection is of fundamental importance to the performance of organic light emitting diode (LED). We have synthesized some trifunctional light emitting molecules in which the hole transporting triphenylamine, electron transporting oxadiazole, and light emitting rhenium bipyridine moieties are linked to each other. We also synthesized other metal complexes with enhanced photosensitivity. These complexes were fabricated into photovoltaic devices. Photocurrent response was observed when the devices were irradiated with solar light.

We have employed the atom transfer radical polymerization (ATRP) in the synthesis of acrylic polymers functionalized with different transition metal complexes. This polymerization method gives improved molecular weight control and narrow molecular weight distribution to the resulting polymers. The resulting functional block copolymers can self-assemble to different structures because of their amphiphilic nature. In selected solvent systems, micelles with spherical, rod, or vesicular shapes were observed. These emissive nanosized micelles may serve as luminescence probe for the surrounding environment.

1. S.C. Yu, S. Hou, W.K. Chan, Macromolecules, 2000, 33, 3273.
2. L.S.M. Lam, W.K. Chan, Chem. Phys. Chem., 2001, 2, 252.
3. P.K. Ng, X. Gong, S.H. Chan, L.S.M. Lam, W.K. Chan, Chem. Eur. J., 2001, 7, 4358.
4. L.S.M. Lam, W.K. Chan, A.B. Djurisic, E.H. Li, Chem. Phys. Lett., 2002, 362, 130.
5. S. Hou, K.K.Y. Man, W.K. Chan, Langmuir, 2003, 19, 2485.
6. S.H. Chan, L.S.M. Lam, C.W. Tse, K.K.Y. Man, Macromolecules, 2003, 36, 5482.
7. K.Y.K. Man, H.L. Wong, W.K. Chan, C.Y. Kwong, A.B. Djurisic Chem. Mater., 2004, 16, 365.
8. H.L. Wong, L.S.M. Lam, K.W. Cheng, K.Y.K. Man, W.K. Chan, C.Y. Kwong, A.B. Djurisic, Appl. Phys. Lett., 2004, 84, 2557.
9. K.W. Cheng, W.K. Chan, Langmuir, 2005, 21, 5247.