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设计了在氮化镓材料上淀积周期光栅银薄膜的结构，利用SPPs增强作用提高LED的发光效率。理论上建立了增强LED的内部发光效率、SPPs辐射匹配以及SPPs辐射衰减模型。实验结果表明：淀积银薄膜的LED结构由于SPPs的增强可以显著提高出光效率；出射光的偏振模式对LED出光效率没有影响；金属光栅的吸收率在占空比达到0.87左右达到峰值；SPPs的增强作用可以显著改善弱光致发光的发光效率和非线性过程。这一研究对于LED发光效率的改进具有明显的理论和实际意义。“,”Surface-plasmon-enhanced GaN-LED was proposed based on the multilayered rectangular nano-grating, which was deposited by periodic raster silver thin film in the gas material. A model was theoretically established, which was enhancing the internal luminous efficiency of LED, the SPPs radiant matching and the SPPs radiant declining. The experiment shows that the structure of the deposited silver thin film can improve the luminous efficiency because of the SPPs enhancement. Polarized mode of the emergent light has no effect on the luminous efficiency of LED; Metal raster absorptivity will achieve the peak if the duty ratio is about 0.87; SPPs potentiation can dramatically improve the luminous efficiency and nonlinear process. The research on the improvement of the LED luminous efficiency has theoretical and practical significance.