Control of perovskite luminescence with metamaterials

Adamo, Giorgio, Krishnamoorthy, Harish N.S., Gholipour, Behrad, Cortecchia, Daniele, So, Jin-Kyu, Birowosuto, M.D., Zheludev, Nikolai and Soci, C. (2018) Control of perovskite luminescence with metamaterials. SPIE Photonics Europe 2018, Strasbourg Convention & Exhibition Centre, Strasbourg, France. 22 - 26 Apr 2018.

Abstract

We show that luminescence spectra of solution-processable metal-halide perovskite films can be controlled by nanopatterning, leading to up to five-fold increase of luminescence yield. We engineered the optical response of the perovskite films using metamaterial design concepts and, as proof of principle, we fabricated all-perovskite dielectric metasurfaces and hybrid metal-perovskite metamaterials which show significantly enhanced luminescence emission and controlled spectral response throughout the visible region. The all-dielectric metamaterials were engraved by direct focused ion beam milling (FIB) onto thin films of methylammonium lead iodide perovskite (CH3NH3PbI3) spin-coated on quartz substrate. The perovskite metasurfaces show vivid structural color tuning and strong field enhancement, dependent on the geometrical parameters of the nanometer sized metamolecules. We observed up to a five-fold Purcell enhancement of both photo- and cathodo-luminescence emission compared to the unstructured films. We also discuss hybridization of perovskite films with plasmonic metamaterials and metal-semiconductor-metal slab waveguide geometries to provide higher control on the light extraction properties. Our results prove that nanostructuring and hybridization of perovskites with metamaterials are viable routes to engineer tunable structural colour and radiative emission properties on-demand, thus defining a new paradigm to increase the efficiency, control the luminescence spectrum, and improve light extraction and directivity of light-emitting devices.

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Contributors

Author: Nikolai Zheludev

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