针对封装胶中掺杂纳米颗粒以及采用梯度折射率的LED封装模式, 用蒙特卡罗方法模拟光在胶体中的传播, 分析散射系数对透光率的影响. 结果表明, 透光率随散射系数增大而减小. 对于固定的封装层数, 各层均采取最佳折射率值时, 透光率可以达到最大. 梯度折射率值逐渐减小的多层纳米掺杂封装结构, 透光率高于传统的封装模式, 能够提高LED的出光效率.

Light propagation in nanoparticle-loaded encapsulants is simulated based on the method of Monte Carlo, referring to the multilayer graded refractive index structure for LED encapsulants. And the influence of scattering coefficient on transmittance is analyzed. The results show that the transmittance decreases with scattering coefficient. For a given number of layers, the encapsulants will yield maximum transmittance if the refractive index value of each layer is optimized. The nanoparticle-loaded encapsulant consists of multiple layers with refractive-index values that gradually decrease, transmittance will be higher than in traditional non-graded encapsulants, and will improve light extraction efficiency of LED.