Introduction, Luiz PereiraThe Organic Light Emitting Devices: The basics, Luiz PereiraMeasuring the Optical and Electrical Properties of OLEDs, Luiz PereiraRare Earth Complexes: The Search for Quasi-Monochromatic OLEDs, Luiz PereiraTransition Metal Complexes: The Path to High Brightness OLEDs, Luiz PereiraSynthesis of Light emitting Complexes, Luiz Pereira and Susana BragaA Final Touch: New OLEDs Research Perspectives, Luiz Pereira