This course will introduce the principles and types of semiconductor materials in optoelectronic. During this course, the mechanisms of LEDs, lasers, and photodetectors will be well described. Due to the promotion of global computer and network construction and the popularity of multimedia, the optoelectronic industry has attracted much attention. Among them, LED optoelectronics, optoelectronic displays, solar cells, lasers, light input and output, and light storage devices are the main products of Taiwan’s optoelectronics industry. This course organizes related application technologies and necessary knowledges for students. Besides, students will also have an oral presentation at the end of the semester.