Figure | Synthesis of Cs/FA alloyed perovskite nanoplatelets for linearly polarized emission. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure | Synthesis of Cs/FA alloyed perovskite nanoplatelets for linearly polarized emission.

Caption

Figure | Synthesis of Cs/FA alloyed perovskite nanoplatelets for linearly polarized emission. a, In-situ photoluminescence spectra during the formation of each Cs/FA ratio of perovskite nanoplatelets (PeNPLs) in colloidal solution. Inset are photographs of colloidal PeNPL solutions illuminated with a UV lamp (365 nm wavelength). The Cs/FA ratio regulates the nucleation and growth kinetics, which influences the extent of nanoplatelet overgrowth and size distribution of PeNPLs. b, Schematic illustration of the synthesis of PeNPLs with tunable Cs/FA ratios. FA incorporation stabilizes the photoactive perovskite phase compared to Cs-only PeNPLs. Nevertheless, when the Cs/FA ratio deviates from the optimal range, heterogeneous growth can induce disordered PeNPLs. c, Polarization dependence of the normalized PL intensity of each PeNPL films. The Cs/FA-alloyed PeNPLs exhibit a higher degree of linear polarization than the Cs-only PeNPLs, which is attributed to their well-oriented superlattice and enhanced optical properties.

Credit

Junzhi Ye et al.

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