Nanopatterning of Perovskite Thin Films for Enhanced and Directional Light Emission

Abstract

Lead-halide perovskites offer excellent properties for lighting and display applications. Nanopatterning perovskite films could enable perovskite-based devices with designer properties, increasing their performance and adding novel functionalities. We demonstrate the potential of nanopatterning for achieving light emission of a perovskite film into a specific angular range by introducing periodic sol−gel structures between the injection and emissive layer by using substrate conformal imprint lithography (SCIL). Structural and optical characterization reveals that the emission is funnelled into a well-defined angular range by optical resonances, while the emission wavelength and the structural properties of the perovskite film are preserved. The results demonstrate a flexible and scalable approach to the patterning of perovskite layers, paving the way toward perovskite LEDs with designer angular emission patterns.

Bright Innovations: Review of Next-Generation Advances in Scintillator Engineering

“…Though self-absorption is addressed as one of the challenges for these materials, the sensitive layers are currently below ∼100 μm. − Thicker layers are desirable to provide higher stopping power to γ-quanta in the energy range important for practical applications, but their performance will suffer from high self-absorption. One of the solutions to decrease self-absorption in thicker lead halide perovskite NCs layers may be in patterning them. , Our hands-on experience with halide perovskites confirms that they are the ideal material for applications involving patterning. The other approach would be to modify the nanocrystals themselves, and modeling of quantum dots could be a great boost to the experimental work.…”

Microstructured Organic Cavities with High‐Reflective Flat Reflectors Fabricated by Using a Nanoimprint‐Bonding Process

“…For fabricating microstructures into microcavity active layers, direct nanoimprinting methods have been previously demonstrated in lead halide perovskite microcavities. [28,29] In organic microcavities, on the other hand, alternative approach for fabricating the microstructure have been proposed including a laser pattering. [18] However, in these approaches, although microstructures can be fabricated with high precision, the subsequent deposition of dielectric thin-film multilayers, acting as the upper DBR, onto a non-planar surface may potentially compromise the quality factor (Q ≈ 500).…”

Intrinsic stability of perovskite materials and their operational stability in light-emitting diodes

“…Recently, efforts have been made to improve the outcoupling efficiency of LEDs by artificially forming textured perovskite films, 167 nanopatterning the perovskite film, 168 using anodic aluminum oxide nanopore structure 169,170 and others. The textured film enhances the scattering of generated photons.…”

“…167 Similarly, the nanopatterning perovskite film shows two-three times emission increment because of a change in the angular distribution of photons. 168 Aluminum oxide nanopores enhance the light extraction efficiency of CsPbBr 3 NCs by redirecting the side directed emission light to the normal direction. 170 Tilting of [PbX 6 ] 4À octahedra induces destabilization in the perovskite structure.…”