Ahn, In-Hwan Yeo, Seon Ju Jung, Kinam Kang, Gumin Shin, Dong-Hun Jang, Ho Seong Kim, Byunghoon Nam, Minwoo Kwon, Seok Joon Ko, Doo-Hyun 2024-01-19T18:02:20Z 2024-01-19T18:02:20Z 2021-09-05 2020-03 1616-301X https://pubs.kist.re.kr/handle/201004/118890 Upconversion nanoparticles (UCNPs) have been integrated with photonic platforms to overcome the intrinsically low quantum efficiency limit of upconversion luminescence (UCL). However, platforms based on thin films lack transferability and flexibility, which hinders their broader and more practical application. A plasmonic structure is developed that works as a multi-functional platform for flexible, transparent, and washable near-infrared (NIR)-to-visible UCL films with ultra-strong UCL intensity. The platform consists of dielectric microbeads decorated with plasmonic metal nanoparticles on an insulator/metal substrate. Distinct improvements in NIR confinement, visible light extraction, and boosted plasmonic effects for upconversion are observed. With weak NIR excitation, the UCL intensity is higher by three orders of magnitude relative to the reference platform. When the microbeads are organized in a square lattice array, the functionality of the platform can be expanded to wearable and washable UCL films. The platform can be transferred to transparent, flexible, and foldable films and still emit strong UCL with a wide viewing angle. English WILEY-V C H VERLAG GMBH SURFACE MODIFICATION ENHANCEMENT PLATFORM A Multi-Functional Highly Efficient Upconversion Luminescent Film with an Array of Dielectric Microbeads Decorated with Metal Nanoparticles Article 10.1002/adfm.201909445 1 ADVANCED FUNCTIONAL MATERIALS, v.30, no.13 ADVANCED FUNCTIONAL MATERIALS 30 13 scie scopus 000512714800001 2-s2.0-85079448684 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article SURFACE MODIFICATION ENHANCEMENT PLATFORM luminescent film microbeads multi-functionality plasmonic effect upconversion