Two-photon excited photoluminescence of single perovskite nanocrystals

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Abstract

Lead-halide perovskite nanocrystals (NCs) have emerged as a novel type of semiconductor nanostructure, attracting great research interests in both fundamental science and practical applications. Here, we compare the optical properties of single CsPbI3 NCs under both one-photon and two-photon excitations, mainly including the photoluminescence (PL) blinking and PL decay dynamics. By means of the PL saturation effect caused by multi-exciton Auger recombination, we have also estimated a two-photon absorption cross section of ∼6.8 × 106 GM for single CsPbI3 NCs. The ability to realize efficient two-photon excitation of single perovskite NCs with strongly suppressed background fluorescence will help not only to promote their bio-imaging and biolabeling applications but also to reveal and manipulate their delicate electronic structures for potential usage in quantum information processing.

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Cao, Z., Lv, B., Zhang, H., Lv, Y., Zhang, C., Zhou, Y., … Xiao, M. (2019). Two-photon excited photoluminescence of single perovskite nanocrystals. Journal of Chemical Physics, 151(15). https://doi.org/10.1063/1.5124734

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