材料科学
等离子体子
量子点
光电子学
激光阈值
表面等离子共振
纳米颗粒
钙钛矿(结构)
表面等离子体子
表面等离子体激元
发光
塞尔效应
纳米技术
自发辐射
激光器
光学
波长
化学
物理
结晶学
作者
Shuya Ning,Zhihui Liu,Shuo Wang,Naming Zhang,Bin Yang,Ziyang Wang,Fanghui Zhang
摘要
All-inorganic halide perovskite quantum dots (QDs) have recently received much attention due to their excellent optoelectronic properties. And their emission properties still need to be improved for further applications. Here, we demonstrated a remarkable emission enhancement of the CsPbBr3 QDs based on an Ag nanoparticle-Ag film plasmonic coupling structure. Through precise control of the gap distance between Ag nanoparticle and Ag film, the localized surface plasmon resonance (LSPR) peak was tuned to match the emission wavelength of the CsPbBr3 QDs. We achieved a 30-fold fluorescence intensity enhancement and a lower lasing threshold, which is 25% of that of the CsPbBr3 QDs without plasmonic coupling structure. It is attributed to that the plasmonic coupling structure exhibits an extremely strong local electric field owing to the coupling between LSPR of Ag nanoparticle and surface plasmon polariton of Ag film. This work provides an effective way to enhance the optical emission of perovskite QDs and promotes the further exploration of on-chip light source.
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