Enhanced Two-photon Fluorescence of CsPbBr3 Nanocrystal Superlattice on Gold Films
Two-photon fluorescence emitted by micro/nanostructured perovskites has been widely applied in high-resolution imaging and photoelectric conversion.However,significantly enhancing the two-photon fluorescence emission intensity is essential for improving the performance of associated devices.Unlike dielectric substrates,the development of micro/nanostructures on precious metal films is effective for achieving enhanced linear and nonlinear optical responses owing to plasmon excitation.The results of this study showed that the optical response of superlattice structures grown on a gold film was stronger than that of samples grown on a glass substrate.Furthermore,experimental results showed that the linear photoluminescence intensity increased by approximately 100％and the two-photon luminescence intensity increased significantly by approximately 16 times.Furthermore,we confirmed a distinct polarization dependence of the two-photon emission of this superlattice by changing the polarization of the pump light,and that the polarization angle exhibited quadruple symmetry within the range of 0°～360°.These results indicated that growing a CsPbBr3 nanocrystalline superlattice on a gold film is an effective strategy to achieve enhanced two-photon emission intensities.This study provides new possibilities and optimization ideas for constructing high-performance micro/nano-nonlinear photonic devices.
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