Journal
NANO LETTERS
Volume 14, Issue 1, Pages 101-106Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403383w
Keywords
Upconversion; surface plasmon; energy transfer; nanoparticles; photophysics
Categories
Funding
- University of Colorado
- Direct For Mathematical & Physical Scien [0847782] Funding Source: National Science Foundation
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Upconversion of infrared radiation into visible light has been investigated for applications in photovoltaics and biological imaging. However, low conversion efficiency due to small absorption cross-section for infrared light (Yb3+), and slow rate of energy transfer (to Er3+ states) has prevented application of upconversion photoluminescence (UPL) for diffuse sunlight or imaging tissue samples. Here, we utilize resonant surface plasmon polaritons (SPP) waves to enhance UPL in doped-lanthanide nanocrystals. Our analysis indicates that SPP waves not only enhance the electromagnetic field, and hence weak Purcell effect, but also increase the rate of resonant energy transfer from Yb3+ to Er3+ ions by 6 fold. While we do observe strong metal mediated quenching (14-fold) of green fluorescence on flat metal surfaces, the nanostructured metal is resonant in the infrared and hence enhances the nanocrystal UPL. This strong Coulombic effect on energy transfer can have important implications for other fluorescent and excitonic systems too.
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