加速可靠性试验中LED寿命的快速评估

Fast Estimation of LED's Accelerated Lifetime by Online Test Method

对于大功率LED产品而言,由于其寿命较长,采用传统的方法测定其寿命需花很长时间,一般采用加速可靠性实验来对LED产品寿命进行测试推断。目前的LED加速寿命测试多采用离线的方法,存在数据样本少、不能准确地反映真实衰减情况的问题.本文提出了一种在线测试的方法,并利用此方法对LED模块的加速寿命进行了推断.实验结果证明,采用在线测试方法可以有效地减少实验时间,达到快速评估高温加速可靠性试验中LED寿命的目的.

For high power LED product, measuring its lifetime by conventional process costs a lot due to its long lifetime. Thus high accelerated reliability test is usually used to project lifetime. Most of the present accelerated test methods can be identified as ＂offline＂ methods, which have problems like small sample data capacity and further, disability to reflect small changes of the product performance within short time. In this paper, we provided an ＂online＂ test method by which the problems above can be exactly solved. A high accelerated experiment was conducted to project a blue LED module＇s accelerated lifetime. The experimental results illustrated that in terms of lifetime projection, the operation time of accelerated life test could be shortened effectively on the guarantee of precision.