Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201909445
Keywords
luminescent film; microbeads; multi-functionality; plasmonic effect; upconversion
Categories
Funding
- National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [NRF-2019R1H1A1080134, NRF-2016M1A2A2940912, 2017R1A2B3006469]
- Technology Development Program to Solve Climate Changes of the National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [NRF-2019R1H1A1080134, NRF-2016M1A2A2940912, 2017R1A2B3006469]
- Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korean government [20193020010370, 20163010012570]
- KIST [2E29300, 2V07560]
- National Research Foundation of Korea [2017R1A2B3006469, 2E30120, 2E29300] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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