material to provide a 655 nm red light with low brightness
levels of approximately 1 to 10 mcd at 20 mA. As LED technology progressed through the 1970s, additional colors and wavelengths became available, such as GaP for green and red lights, GaAsP for orange and high efficient red light, and GaAsP for yellow light, etc., (Yeh and Chung, 2009). In 1980s, a new material gallium aluminum arsenide (GaAlAs) was developed to provide superior performance over previously available LEDs with a minor improvement in brightness and efficiency. In the late 1980s, LED designers started to produce high-brightness and high reliability LEDs. This has led to the development of indium gallium aluminum phosphide (InGaAlP) LEDs that can have different color output via adjusting the energy bandgap.