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이준상,김동하,현가담 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The miniaturization of color filters has received a great deal of attention for their use in displays and high-speed chips. However, most miniaturized color pixels reported up to date have been based on metal array structures implementing surface plasmon polaritions (SPPs), which suffer from degraded performance when the number of array elements decreases. Herein, we propose a pixel design that does not rely on SPPs, but rather on the resonant reduction of scattering via a metal-semiconductor-metal hybrid nanostructure array. Such hybrid nanostructure can transmit specific wavelengths of visible light even with a single array element without compromising the spectral purity. As an array, by effectively manipulating the different spatial parameters, the optical filters enable multi-spectral imaging and snapshot hyperspectral imaging at 10 folds sizes below the Nyquist limit. These functions provide additional degrees of freedom for enhanced optical information storage system.
김민주,김영지,현가담,김동하 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Perovskite quantum dots (PeQDs) have received much attention due to excellent 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 but low quantum yield of UCNPs and photoluminescence (PL) intensity of PeQDs 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 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.