Introduction to Organic Light Emitting Diode (OLED) Physics explains the underlying material and device physics that impact the performance of organic materials for OLED applications. The author details the mechanisms involved in OLED operation and the importance of OLED physics. The author provides the logic of key formulas and concepts necessary to interpret and analyze experimental results in OLED research. There is also discussion of emerging opportunities and remaining challenges to the advancement of OLED research. Introduction to Organic Light Emitting Diode (OLED) Physics provides the fundamental concepts of OLED physics and light emitting materials including carrier mobility (which is vital for enhancing the efficiency of OLED technologies). Remaining challenges to improving the performance of OLEDs, including attention to device fabrication, are investigated. The author systematically compares the most relevant materials utilized for OLED applications and provides details on their differences. The book is suitable for new entrants and experienced researchers in the disciplines of materials science and engineering and physics working in academia and industry.