Proceedings Article | 24 November 2023
KEYWORDS: Gold, Electric fields, Nanoparticles, Localized surface plasmon resonances, Perovskite, Dielectrics, Metals, Polymethylmethacrylate, Optical properties, Fluorescence
All-inorganic halide perovskite, such as CsPbX3(X=Cl, Br, I) has excellent photoelectric performance, with high fluorescence quantum yield, large carrier mobility, nanocrystalline size adjustment, large gain coefficient and other advantages. It has broad application prospects in light-emitting diodes (LED), solar cells, lasers and other photoelectric devices. However, with the further study of perovskite materials, it is shown that the way and the optimization of the process to enhance the green light efficiency of perovskite is complex, which greatly restricts the development of the device. Local surface plasmon resonance (LSPR) absorption is a unique optical property of nanoparticles and is one of the hot research directions in the field of nanophotonics. It has important applications in enhancing luminous efficiency, Raman scattering, detector absorption and so on. In this paper, the finite-difference time-domain method was used to investigate the variation of the resonance absorption peaks of gold nanoparticles (Au NPs) with sizes. An appropriate size of Au NP was selected to enhance the luminescence intensity of CsPbBr3 thin films. Meanwhile, different dielectric layer materials (SiO2, PMMA, MgF2, respectively) and different thicknesses of them (5, 10, 15, 20 nm, respectively) was chosen to optimize the performance of this structure to prevent fluorescence quenching between Au NPs and perovskite layer. The results show that the size and spacing of Au nanostructures, as well as the refractive index and thickness of the substrate, can significantly affect the LSPR effect. This provides an effective solution and experimental experience for enhancing the efficiency of green perovskite luminescence.
