2011-12-19 10:38In the 1970s, the earliest GaP and GaAsP homo-junction LEDs with low luminous efficiency in red, yellow, and green colors started to be used for indicator ligh......
2011-12-15 10:20In the 1970s, the earliest GaP and GaAsP homo-junction red, yellow, and green LEDs with low light emission efficiency began to be used for indicator lights, nu......