This book on optoelectronics is a collection of chapters presented in a manner that it illustrates significant conceptual topics of this dynamic field of study. The chapters have been put together by an international group of authors in such a manner that together, they provide highly informative knowledge on this subject. A few chapters in this book are descriptive notes of different applications used in optoelectronics. Different phenomena related to Optoelectronics have also been discussed in this book.