Evaluation of AlGaInP LEDs reliability based on accelerated tests

High efficiency LEDs are replacing incandescent bulbs in many applications particularly those requiring durability and low power consumption. In some of these applications, as automotive and traffic signals, LEDs work in outdoor environment and in some cases in extreme temperature and humidity conditions. Main failure mechanisms have been identified for the different stress conditions (temperature/humidity accelerated tests). MTTF of 127,000 h have been evaluated for real working conditions by means of applying Arrhenius and Peck model values obtained in this paper.