Very high luminescence enhancement of perovskite quantum dots (PeQDs) is achieved under near-infrared excitation through sensitization by upconversion nanoparticles (UCNPs) and localized surface plasmon (LSP) coupling. To overcome the low quantum yield of UCNPs, the plasmonic effect is exploited through a metal-insulator-metal (MIM) configuration. Here, Au nanorods (AuNRs) on a UCNPs/PeQDs (UP) layer supported by a Ag film (AuNRs-UCNPs/PeQDs-Ag film, or MUPM) configuration using UCNPs and PeQDs of similar sizes as the insulator layer is reported for the first time. Despite the thin thickness of the UP layer, we observed strong green emission from the PeQDs under 980 nm excitation, indicating high energy transfer efficiency. Furthermore, by capping AuNRs with amphiphilic diblock copolymers, photoluminescence quenching is suppressed. An overall 29-fold upconversion enhancement is achieved for the green emission in the MUPM compared with a UCNPs/PeQDs-glass owing to the strongly localized electric field from gap surface plasmons and the coupling of the longitudinal LSP resonance band of AuNRs with the excitation of UCNPs. This study provides a novel pathway to prepare a highly efficient and effective emissive device based on MIM configurations using UCNPs and PeQDs, which can be expanded to serve as a generalized platform in a wide range of optoelectronic applications.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (NRF-2020R1A2C3003958 (D. H. K), 2017R1A5A1015365 (J. K. H.), 2019R1C1C1002802 (J. K. H.)), the Basic Science Research Program (Priority Research Institute) funded by the Ministry of Education (2021R1A6A1A10039823 (D. H. K.)), the Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (2020R1A6C 101B194 (D. H. K, J. K. H.)), the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2018M3D1A 1058536 (D. H. K.)), and the Ministry of Science and Technology (MOST 109-2113-M-002-020-MY3 (R. S. L.)). We appreciate Dr Hyungduk Ko at the Center for Opto-Electronic Convergence Systems at Korea Institute of Science and Technology for providing fruitful discussions.
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