An inhomogeneous interface reaction in a liquid–liquid immiscible two-phase system is developed to realize the large-scale room-temperature synthesis of perovskite-related Cs4PbBr6 fluorophores.
Monodisperse Au, Ag, and Au3Pd nanoparticles (NPs) with narrow size distribution are prepared by direct reaction of the related metal salt with oleylamine in toluene. Oleylamine serves as both a reducing agent and a surfactant in the synthesis. The sizes and shape of these NPs are tuned by reaction temperatures. The hydrophobic oleylamine-coated NPs can be made water soluble by replacing oleylamine with 3-mercaptopropionic acid. Both surface plasmonic resonance (SPR) and surface enhanced Raman scattering (SERS) observed from the Au and Ag NPs are found to be NP size- and surface-dependent.
Tunability of emitting colors of perovskite quantum dots (PQDs) was generally realized via composition/size modulation. Due to their bandgap absorption and ionic crystal features, the mixing of multiple PQDs inevitably suffers from reabsorption and anion-exchange effects. Herein, we address these issues with high-content Mn-doped CsPbCl PQDs that can yield blue-excitable orange Mn emission benefited from exciton-to-Mn energy transfer and Cl-to-Br anion exchange. Silica-coating was applied to improve air stability of PQDs, suppress the loss of Mn, and avoid anion-exchange between different PQDs. As a direct benefit of intense multicolor emissions from Mn-doped PQD@SiO solid phosphors, a prototype white light-emitting diode with excellent optical performance and superior light stability was constructed using green CsPbBr@SiO and orange Mn: CsPb(Cl/Br)@SiO composites as color converters, verifying their potential applications in the field of optoelectronics.
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