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arXiv · 1808.01140

Nanophotonic enhanced two-photon excited photoluminescence of perovskite quantum dots

Christiane Becker·Sven Burger·Carlo Barth·Phillip Manley·Klaus Jäger·David Eisenhauer·Grit Köppel·Pavel Chabera·Junsheng Chen·Kaibo Zheng·Tönu Pullerits
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Abstract

All-inorganic CsPbBr3 perovskite colloidal quantum dots have recently emerged as promising material for a variety of optoelectronic applications, among others for multi-photon-pumped lasing. Nevertheless, high irradiance levels are generally required for such multi-photon processes. One strategy to enhance the multi-photon absorption is taking advantage of high local light intensities using photonic nanostructures. Here, we investigate two-photon-excited photoluminescence of CsPbBr3 perovskite quantum dots on a silicon photonic crystal slab. By systematic excitation of optical resonances using a pulsed near-infrared laser beam, we observe an enhancement of two-photon-pumped photoluminescence by more than one order of magnitude when comparing to using a bulk silicon film. Experimental and numerical analyses allow relating these findings to near-field enhancement effects on the nanostructured silicon surface. The results reveal a promising approach for significant decreasing the required irradiance levels for multi-photon processes being of advantage in applications like low-threshold lasing, biomedical imaging, lighting and solar energy.

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Christiane Becker, Sven Burger, Carlo Barth, Phillip Manley, Klaus Jäger, David Eisenhauer, Grit Köppel, Pavel Chabera, Junsheng Chen, Kaibo Zheng, Tönu Pullerits. 2018-08-03. Nanophotonic enhanced two-photon excited photoluminescence of perovskite quantum dots. https://doi.org/10.1021/acsphotonics.8b01199

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