The structure design and properties of a blue-light-transmitted and yellow-light-reflected intermediate layer are presented and analyzed in this paper. The ZnS/TiO₂/MgF₂ multilayer thin film was prepared by means of TFC software simulation and magnetron sputtering, and its surface topography was compact and uniform with low roughness of 6.229 nm and small thickness of 912 nm. Neither blue emission from LED chips nor yellow emission from phosphors would be absorbed by this type of multilayer film during the experiment. Furthermore, for ZnS/TiO₂/MgF₂ multilayer films, the five-layered structure is more suitable to achieve white LEDs with higher luminous efficiency, which shows maximum transmittance of blue light and average transmittance of yellow light were found to be around 86 % and 35 %, respectively. While applying this film between conventional blue chips and YAG: Ce phosphors, backscattered photons from phosphor layer to blue chip can be significantly decreased at the expense of relatively less exciting blue light, making great contribution to the overall increase in luminous efficiency.

本文介绍并分析了透射蓝光和反射黄光的中间层的结构设计和性能。通过TFC软件模拟和磁控溅射制备了ZnS / TiO ₂ / MgF ₂多层薄膜，其表面形貌致密均匀，粗糙度低，为6.229 nm，厚度为912 nm。在实验过程中，这种类型的多层膜既不会吸收来自LED芯片的蓝色发射，也不会吸收磷光体的黄色发射。此外，对于ZnS / TiO ₂ / MgF ₂在多层膜中，五层结构更适合于实现具有更高发光效率的白光LED，这表明蓝光的最大透射率和黄光的平均透射率分别约为86％和35％。在传统的蓝芯片和YAG：Ce荧光粉之间应用此膜时，可以以相对较少的激发蓝光为代价，大大减少从荧光粉层到蓝芯片的反向散射光子，从而为总体提高发光效率做出了巨大贡献。