Abstract
Hybrid halide perovskites are semicondoctor materials with desirable characteristics of color-tunable and narrow-band emissions for lighting and display technology. They have size-tunable emissions due to quantum size effects. In this work, the Formamidinium Lead Bromide perovskite CH(NH2)2PbBr3 nanoplatelets (NPLs) were successfully synthesized by ligand-assisted reprecipitation method under room condition, in which the emission color-tunability was realized via quantum size effect without anion–halide mixing, by varying the oleylamine to oleic acid volume ratio as surfactants, while the total amount of oleic acid remained unchanged. We are able to adjust the optical proprieties of FAPbBr3 NPLs and, consequently, their structural properties. The obtained colloidal solutions of FAPbBr3 nanoplatelets with uniform size exhibited different photoluminescence wavelengths covering the spectral region from 440 to 525 nm. The maximum absolute PL quantum yield (PLQY) of the green emission was measured to be as high as 80% at room temperature. The size of FAPbBr3 NPLs could be effectively tuned from 15.5 to 38.1 nm with an increase in the oleylamine and oleic acid ligands ratio.
Highlights
Lighting and display technologies are seeking emitter materials with the ability to precisely fine-tune the emission wavelength with narrow FWHM, to improve the color performance of lighting and display systems [1]
Lead halide perovskites NCs have attracted great attention due to their excellent performance, including precisely tunable narrow emission spectrum across the visible region, high photoluminescence quantum yields (PLQYs), as well as high stability [2,3,4]. This class of materials has already shown great potential in many areas, such as solar cells [5], lasers [6], and advanced photonics [6], owing to their exceptional optoelectronic properties and their lower cost and more simple synthesis compared to the state of the art semiconductor materials
Hybrid halide perovskites NCs are a new type of perovskite semiconductor material where the structure contains an organic and metal cation, which can have the properties of organic semiconductors as well as those of the inorganic
Summary
Lighting and display technologies are seeking emitter materials with the ability to precisely fine-tune the emission wavelength with narrow FWHM, to improve the color performance of lighting and display systems [1]. Lead halide perovskites NCs have attracted great attention due to their excellent performance, including precisely tunable narrow emission spectrum across the visible region, high photoluminescence quantum yields (PLQYs), as well as high stability [2,3,4]. Hybrid halide perovskites NCs are a new type of perovskite semiconductor material where the structure contains an organic and metal cation, which can have the properties of organic semiconductors as well as those of the inorganic Their typical crystal structure is illustrated, where A is a monovalent cation such as methylammonium (CH3NH+; MA+) or formamidinium (CH(NH2)2+; FA+) positioned at the center, B is a divalent metal cation (Pb2+) at the center of the octahedra, and X is a halide anion (Cl−, Br−, or I−) that occupies the corner-sharing BX6 octahedra (Figure 1).
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