高折射率发光二极管纳米复合封装材料的数值分析
Numerical analysis of high-index nanocomposite encapsulant for light-emitting diodes
摘要：
我们使用二维时域有限差分法（FDTD）软件研究了纳米粒子从散射体到光学均匀介质的跃迁行为。我们测量了位于高折射率介质（折射率=2.00）中并由低折射率树脂（折射率=1.41）封装的偶极源的传输效率。为了组成折射率匹配的树脂并减少内反射，在各种尺寸和密度的模拟中将高折射率纳米颗粒添加到低折射率树脂中。由于纳米颗粒的尺寸和颗粒之间的平均间距分别减小到0.02 λ和0.07 λ，与没有纳米颗粒的情况相比，传输效率提高了两倍。数值结果可用于理解纳米颗粒的光学行为，并通过使用纳米复合封装剂来提高高亮度发光二极管（LED）的提取效率。
英文摘要：
We used two-dimensional Finte-Difference-Time-Domain (FDTD) software to study the transition behavior of nano-particles from scatterers to an optically uniform medium. We measured the transmission efficiency of the dipole source, which is located in the high refractive index medium(index=2.00) and encapsulated by low index resin(index=1.41). In an effort to compose index-matched resin and to reduce internal reflection, high-index nano-particles are added to low-index resin in simulations of various sizes and densities. As the size of the nano-particles and the average spacing between particles are reduced to 0.02 lambda and 0.07 lambda respectively, the transmission efficiency improves two-fold compared to that without nanoparticles. The numerical results can be used to understand the optical behavior of nano-particles and to improve the extraction efficiency of high brightness light-emitting-diodes(LEDs), through the use of nano-composite encapsulant.
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