Light-Emitting Halide Perovskite Nanoantennas

Halide perovskites are known like a veryattractive material for all-dielectric resonant nanophotonics due to theirproperties. Here we employ halide perovskites to create light-emitting nanoantennas with enhanced... [ view full abstract ]

Halide perovskites are known like a veryattractive material for all-dielectric resonant nanophotonics due to theirproperties. Here we employ halide perovskites to create light-emitting nanoantennas with enhanced photoluminescence due to the coupling of their excitons to dipolar and multipolar Mie resonances and demonstrate that the halide perovskite nanoantennas can emit light in the range of 530–770 nm depending on their composition.

Organic-inorganic (hybrid) perovskites of the MAPbX₃ family represent a class of dielectric materials with excitonic states at room temperature, refractive indices (n=2–3) high enough for the efficient excitation of Mie resonances, low losses at the exciton wavelength, chemically tunable band gap over the entire visible range (400–800 nm) by simple replacing or mixing the anion compound (I, Br or Cl), high defect tolerance, and high quantum yield (more than 30%) of photoluminescence (PL). These properties make them perfect candidates for effective nanoscale light sources.

In this work, we fabricate by laser printing method perovskite nanoparticles (NPs) supporting electric and magnetic dipolar and multipolar Mie resonances.

Fig.1 (a) Red curve corresponds to experimental DF scattering spectrum for single perovskite NP with diameter 415 nm. Green and blue lines stand for analytical mode decomposition for single spherical perovskite NP of 440 nm in homogeneous air media. (b) PL spectra (marked by the corresponding colors of the frames of SEM image) normalized to the volume for perovskite NPs as well as for 0.5 μm perovskite film. Scale bar in the SEM image is 400 nm.

Fig.2 Resonant properties of perovskite nanoparticles with different composition. (a,c,e) Blue curve corresponds to experimental dark-field scattering spectra for single perovskite nanoparticles of different composition on a glass substrate. Filled color areas correspond to experimentally measured PL spectra of perovskite nanoparticles. (b,d,f) Red solid line shows analytical scattering spectrum in dark-field configuration for MAPbBr3, MAPbBr_1.5I_1.5, MAPbI₃ perovskite nanoparticles with diameters of 280, 240, and 260 nm, respectively. Green and blue lines stand for the mode decomposition in air (green dashed, MQ; blue dashed, EQ; green solid, MD, blue solid, ED).