Research Interests

Spectroscopy and photophysics of organic molecules, metal organic complexes and dyes. The photophysics and spectroscopy of electrically driven light emitting materials. Stark and Zeeman spectroscopy. Photophysics of wide gap semiconductors particularly silver halides and materials with forbidden band to band transitions. Semiconductor donor acceptor radiative recombination investigations with emphasis on the use of optically detected magnetic resonance spectroscopy. Quantum size effects in semiconductors.

Academic Interactions

Joint supervision (w/J. H. Eberly-Uni of Rochester) of physics grad. student W. McColgin. PhD Thesis 1975-'Optical Site Selection of Large Organic Molecules'
Joint supervision (w/G. McClendon, Uni of Rochester) of chemistry grad. student
K. P. Johansson. PhD Thesis 1991-'The Effect of Size Restriction on the Optical Properties of direct and Indirect Gap Semiconductors.
Joint supervision (w/G. McClendon, Uni of Rochester) of chemistry grad. student M. I. Freedhoff. PhD Thesis 1995-Quantum Confinement Effects on Semiconductor Nanocrystals: Direct, Direct Forbidden and Indirect Gap Materials.
Joint supervision (w/P. Fauchet, Uni of Rochester) of physics grad. student P. J. Rodney. PhD Thesis 1998-The Photophysics of Ionic Semiconductors at Low Temperatures: Silver Bromide, Silver Iodide and Cuprous Oxide.

Recent publications

Exciton Self-trapping in AgCl Nanocrystals, H. Vogelsang, O. Hisberg, U. Kohler, W. von der Osten and A. P. Marchetti, Phys. Rev. B, 61, 1847 (2000).

Effects of size restriction on donor-acceptor recombination in AgBr, Paul J. Rodney, Alfred P. Marchetti, and Philippe M. Fauchet, Phys. Rev. B, 62, 4215 (2000).

AgBr nanocrystals in glass: Optical and ODMR investigations, Alfred P. Marchett, Paul J. Rodney and Wolf von der Osten, Phys. Rev. B, 64, 132201 (2001).

Current-induced fluorescence quenching in organic light-emitting diodes, Ralph H. Young, Ching W. Tang and Alfred P. Marchetti, Appl. Phys. Lett. 80, 874 (2002).

Aqueous Phase Self-Assembly of Nanoscale p-n Heterojunctions. Joseph F. Bringley, Raymond S. Eachus, and Alfred P. Marchetti, Journal of Physical Chemistry B, 5346 106 (2002).

The Photophysics of Sulfur-Containing Centers on AgBr Surfaces, Alfred P. Marchetti, Ken Lushington and Roger Baetzold, J. Phys. Chem. B, 107, 136 (2003).

Nanoregions of fcc AgI in AgBr microcrystals, Alfred P. Marchetti, Jeff C. Hansen, Sam Chen, Mark Irving, Roger Baetzold and Byron R. Sever, Phys. Rev. B, Feb 04.