State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.
Nanoscale. 2017 Dec 14;9(48):19353-19359. doi: 10.1039/c7nr06750j.
Organic single crystals have attracted great attention because of their advantages such as high carrier mobility and high thermal stability. Amplified spontaneous emission (ASE) is an important parameter for the optoelectronic applications of organic single crystals. Here, surface plasmon-enhanced ASE from the organic single crystals has been demonstrated by integrating graphene/copper nanoparticle (Cu NP) hybrid nanostructures. Graphene is fully accommodating to the topography of Cu NPs by the transfer-free as-grown method for the configuration of the hybrid nanostructures, which makes full electrical contact and strong interactions between graphene and the local electric field of surface plasmon resonances. The enhanced localized surface plasmon resonances induced by the hybrid nanostructures result in an enhanced intensity and lowered threshold of ASE from the organic single crystals. Moreover, the as-grown graphene sheets covering fully and uniformly on the Cu NPs act as a barrier against oxidation, and results in an enhanced stability of the fluorescence from the crystals.
有机单晶体因其载流子迁移率高、热稳定性好等优点而受到广泛关注。受激辐射放大（ASE）是有机单晶体光电应用的一个重要参数。在这里，通过集成石墨烯/铜纳米粒子（Cu NP）杂化纳米结构，实现了有机单晶体的表面等离子体增强 ASE。通过无转移的原位生长方法，石墨烯完全适应 Cu NPs 的形貌，以配置杂化纳米结构，从而实现石墨烯与表面等离激元共振局域电场之间的充分电接触和强相互作用。杂化纳米结构引起的局域表面等离激元共振增强导致有机单晶体的 ASE 强度增强和阈值降低。此外，完全和均匀覆盖在 Cu NPs 上的生长石墨烯片作为氧化的阻挡层，使晶体的荧光稳定性增强。
