出光率是影响LED发光效率的重要因素之一, 优化LED出光率可以提高LED的器件发光效率。文章利用TracePro软件模拟分析了封装结构对LED出光率的影响, 分析结果表明：封装腔体的形状与出光率关系不大, 而封装腔体的张角、封装腔体顶面的凹凸性与出光率有较大关系, 另外出光率还与腔体的高度、封装腔体的反射率、腔体的母线均相关。总之LED封装结构会影响LED出光率, 在进行LED封装时, 要选择合适的封装结构才能获得较高的LED出光率。

The light extraction plays an important role in LED encapsulation to obtain a high efficiency. The influence of package structure on LED light extraction was investigated by the TracePro simulation in this work.The results indicate that cavity shape almost have no effect on light extraction, ratio of light-out depends on the flare angle of cavity and salient of top surface, additionally, ratio of light-out is related to the height, reflectance and bus of a certain cavity. Overall, the structure of package truly affect the LED light extraction, hence package structure plays a significant role in packaging LED with high light extraction.