Luminescence Enhancement of Upconversion Nanoparticle Sensitized Perovskite Quantum Dots in Metal-insulator-metal Configuration under NIR Excitation
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All inorganic perovskite quantum dots (PeQDs) have received much attention due to excellent optical properties. However, due to their low efficiency under near-infrared (NIR) light excitation, potential applications have been limited. Recently, upconversion nanoparticle (UCNP) sensitized PeQD has been reported as a solution, but low quantum yield of UCNPs and photoluminescence (PL) intensity of PeQD film have still remained as challenges. In this work, UCNP sensitized PeQDs and polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) capped gold nanorods (AuNRs) were deposited on a metallic reflector, forming AuNRs/UCNPs and PeQDs/Ag film (MUPM) configuration. By exploiting gap plasmon polariton and localized surface plasmon effects, PL intensity of PeQDs increased under NIR excitation. Furthermore, PS-b-P2VP used as capping ligand prevented PL quenching from the direct contact of AuNRs and Ag film. This work provided a new platform to boost PL intensity of PeQD film under NIR excitation.