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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20nm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 materials have got new applications in optoelectronic devices such as perovskites (PeLEDs) and lasers. How to further improve the luminous efficiency of perovskite thin films is a hot topic at present. The doping of gold nanoparticles (Au NPs) with 20 nm diameter into the interfacial layer PEDOT: PSS enhanced the fluorescence intensity of the luminescent layer with methylamine lead bromide (CH3NH3PbBr3) film by 2.7 times. The results show that the introduction of Au NPs effectively enhances the absorption of CH3NH3PbBr3 thin films and increases the radiation transition rate of excitons. At the same time, combined with optical simulation, it was found that the near-field and far-field surface plasmon polaritons of Au NPs are effectively coupled with the absorption / emission region of the perovskite thin film to maximize the luminous efficiency. It is suggested that the use of the Au NPs near-field and far-field plasmon effect can maximize the fluorescence emission efficiency of perovskite films. This study provides important theoretical guidance and technical support for the preparation of high efficiency PeLEDs and lasers .