有机-无机杂化钙钛矿材料在钙钛矿发光二极管(PeLEDs)和激光器等光电器件中得到了新的应用,如何进一步提高钙钛矿薄膜的发光效率是目前的研究热点。将20 nm粒径的金纳米粒子(Au NPs)掺杂至界面层PEDOT∶PSS中,可使以甲胺铅溴盐(CH₃NH₃PbBr₃)薄膜为发光层的荧光强度提升了2.7倍。研究表明,Au NPs的引入有效增强了CH₃NH₃PbBr₃薄膜的吸收,并提高了激子的辐射跃迁速率。同时,结合光学仿真进行分析,发现Au NPs的近场和远场表面等离激元均与钙钛矿薄膜吸收/发射区域有效耦合,从而最大程度地提高发光效率。提出利用Au NPs的近场和远场复合表面等离激元效应可最大程度地提高钙钛矿薄膜的荧光发射效率,该研究对制备高效率PeLEDs和激光器等提供了重要的理论指导和技术支持。

Organic-inorganic hybrid perovskite has been attracted increasing attention in perovskite light-emitting diodes (PeLEDs) and lasers. How to improve the luminous efficiency of perovskite film is a hot topic. Gold nanoparticles (Au NPs) with diameter of 20 nm are doped into PEDOT∶PSS. The emission intensity of CH3NH3PbBr3 film increases 2.7-fold when the CH3NH3PbBr3 film is used as the luminescent layer. The results show that, the absorption of CH3NH3PbBr3 film and the radiation transition rate of excitons are improved when Au NPs are introduced. The results of the analysis combined with optical simulation show that the near-field and far-field surface plasmons of Au NPs can both coupling with absorption and emission areas of perovskite film, and the maximize luminous efficiency can be obtained. The luminous efficiency of perovskite film can be improved at the greatest extent by comprehensive surface plasmons of Au NPs in near field and far field, which can provide important theoretical direction and technical support in the fabrications of high efficiency PeLEDs and lasers.