超薄金膜-发光层-光子晶体三明治结构的光学特性及荧光调制

Optical Properties and Fluorescence Modification of the Sandwich Structure Composed of Ultra-Thin Gold films, Light-Emitting Layers and Photonic Crystals

结合垂直沉积自组装法和旋涂法制备了由超薄金膜、发光层和三维光子晶体组成的三明治结构。通过对样品的衰减全反射曲线进行测量和分析,发现该三明治结构的光学特性取决于光子晶体的质量,高质量三维光子晶体使得三明治结构的衰减全反射曲线在48°和63°两个位置出现了反射波谷,而低质量三维光子晶体的三明治结构的反射波谷完全消失。与薄金膜-发光层双层结构相比,该三明治结构的荧光特性曲线也出现了显著变化,单一辐射峰分裂为双峰,且位于600nm的辐射峰比位于620nm处的辐射峰要弱30%。

Sandwich structures composed of an ultra-thin gold film, a light-emitting layer and a three-dimensional （3D） photonic crystal （PC） are fabricated by the vertical deposition method and spin-coating method. Attenuated total reflection measurements show that the 3D PC plays a crucial role in the formation of significant optical properties. For the sandwich structure with a high-quality 3D PC, two reflection troughs are clearly observed at the incidence angles of 48° and 63°, while the reflection troughs disappear in the attenuated total reflection curves of the sandwich structures for those with a low-quality 3D PC. Compared with the two-layer structures of ultra-thin gold film and light-emitting layer, pronounced changes are found in the curves of the fluorescence properties of the sandwiches, the single emitting peak at 600 nm of quantum dots （QDs） is split into two peaks, and the intensity of peak positioned at 600 nm is weaker than that positioned at 620 nm by 30%.