Use of the arrhenius model for acceleration estimate of the temperature aged HP LEDs

Under normal conditions it may take years to gather failure data on the life cycle of new LED products. Through accelerated life testing the product life of HP LED is simulated by increasing the stress levels of the ambient temperature to higher than normal. A lifetime acceleration estimate is made using the Arrhenius model. The value of activation energy is not assumed, but is experimentally determined by performing tests at multiple temperatures and plotting the results. The acceleration factor is obtained by the ratio of the reaction rates at the tested temperatures and the declared temperature. Using the correct value of the activation energy is important because it represents the dominating reason for degradation and small change in its value will have an effect on the acceleration factor.Under normal conditions it may take years to gather failure data on the life cycle of new LED products. Through accelerated life testing the product life of HP LED is simulated by increasing the stress levels of the ambient temperature to higher than normal. A lifetime acceleration estimate is made using the Arrhenius model. The value of activation energy is not assumed, but is experimentally determined by performing tests at multiple temperatures and plotting the results. The acceleration factor is obtained by the ratio of the reaction rates at the tested temperatures and the declared temperature. Using the correct value of the activation energy is important because it represents the dominating reason for degradation and small change in its value will have an effect on the acceleration factor.