The involvement of inorganic chemistry in the field of optoelectronics is natural, since the electronic structure of a metal compound that confers novel optical properties is often one that also influences its electron transfer and conductivity characteristics. Two important growth areas for optoelectronics are communications and medicine. The major topics covered in the present book are nonlinear optics of transition meal compounds, inorganic clusters and organometallics, electroluminescence, photovoltaic solar cells, photoluminescence, optical sensors and metallo-organic materials for optical telecommunications. There are also specific chapters on pressure effects on emissive materials and the photophysical and photochemical properties of gold complexes. This book is intended for faculty, postdoctoral and graduate student level researchers at universities and research scientists at corporations and national laboratories. The book should be of interest to scientists in the fields of Inorganic Chemistry, Materials Science, Photophysics and Solid State Materials. Optoelectronics is a unique, interdisciplinary field that spans many disciplines.