This book discusses the advanced concepts in the field of optoelectronics. Optoelectronics focuses on the study and function of electronic tools that release, identify and control light. As a field of study, it has widely flourished internationally and enabled many of the currently used conveniences. Because of this universality, novel functions and optical phenomena have led to further modernization. This book covers current achievements by experts around the world. A lot of developed and developing nations have contributed to this attempt. Chapters in this book are written by prominent scientists working in USA, Japan, India, as well as through the joint participation of the US and Moldova scientists. This book also describes the methods of production of optoelectronic devices. It also includes an analysis of operation and areas of application of such devices.