Tuning the Luminescence of Layered Halide Perovskites

Abstract

Layered halide perovskites offer a versatile platform for manipulating light through synthetic design. Although most layered perovskites absorb strongly in the ultraviolet (UV) or near-UV region, their emission can range from the UV to the infrared region of the electromagnetic spectrum. This emission can be very narrow, displaying high color purity, or it can be extremely broad, spanning the entire visible spectrum and providing high color rendition (or accurately reproducing illuminated colors). The origin of the photoluminescence can vary enormously. Strongly correlated electron−hole pairs, permanent lattice defects, transient light-induced defects, and ligand-field transitions in the inorganic layers and molecular chromophores in the organic layers can be involved in the emission mechanism. In this review, we highlight the different types of photoluminescence that may be attained from layered halide perovskites, with an emphasis on how the emission may be systematically tuned through changes to the bulk crystalline lattice: changes in composition, structure, and dimensionality.

Essential Amino Acid–Enabled Lead Bromide Perovskite Nanocrystals with High Stability

“…Development of luminescent, low‐cost, less toxic, color converters is a dynamic area of research . Metal halide perovskite semiconductor nanocrystals have emerged as a promising material for solution‐processed light emitters .…”

“…Despite of their success, there remain critical gaps in chemistry and scope to removal of lead and ligand toxicity. For example, nontoxic ligand–stabilized perovskite nanocrystals are rarely demonstrated in the literature . The installation of nontoxic ligands onto the surface of the perovskite nanocrystals substrate represents a unique synthetic challenge, that if overcome could significantly expand the utility of nontoxic‐based perovskite interfaces.…”

“…Colloidally stable MAPbX 3 perovskite nanocrystals with well‐defined optical properties have been reported since 2014 . Since then, colloidal MAPbX 3 quantum dots with long aliphatic ligand have been routinely prepared with high photoluminescence quantum yield . In our previous work, short bidentate ligand is used for the synthesis of stable perovskite nanomaterials .…”

Mechanochromic and Electroluminescence Properties of a Layered Hybrid Perovskite Belonging to the <110> Series

“…Films of 1 spin‐coated from DMSO solutions onto different substrates present slightly different emission properties (see Figure and SI), a common feature in hybrid perovskite thin films . As prepared films deposited onto plasma treated quartz substrates display emissions bands peaked at about 490 nm (FWHM = 193 meV, τ av = 24.6 ns) while films deposited onto PEDOT:PSS coated substrates show narrower bands peaked at about 515 nm (FWHM = 146 meV, τ av = 84.9 ns).…”

“…Low‐dimensional hybrid perovskites which have attracted much attention in the 90's, appear again these recent years as a fascinating class of semiconductor materials . Two main series of layered perovskite networks are known.…”