Tip Enhancement of Upconversion Photoluminescence from Rare Earth Ion Doped Nanocrystals
| Autor: | Nina Mauser, D. Piatkowski, Marcin Nyk, Achim Hartschuh, Tobia Mancabelli, Sebastian Mackowski |
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| Rok vydání: | 2015 |
| Předmět: |
Photoluminescence
Materials science business.industry General Engineering General Physics and Astronomy Context (language use) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Photon upconversion 0104 chemical sciences Ion Nanocrystal Optoelectronics General Materials Science Spontaneous emission 0210 nano-technology business Image resolution Excitation |
| Zdroj: | ACS Nano. 9:3617-3626 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/nn504993e |
| Popis: | We present tip-enhanced upconversion photoluminescence (PL) images of Er(3+)- and Yb(3+)-doped NaYF4 nanocrystals on glass substrates with subdiffraction spatial resolution. Tip-sample distance dependent measurements clearly demonstrate the near-field origin of the image contrast. Time-resolved PL measurements show that the tip increases the spontaneous emission rate of the two emission channels of Er(3+) in the visible region. Very efficient enhancement of upconversion PL is discussed in the context of the two-photon nature of the excitation process and homoenergy transfer between the ions within the nanocrystals. Comparison between different nanocrystals and tips shows a strong influence of the tip shape on the image contrast that becomes particularly relevant for the larger dimensions of the investigated nanocrystals. |
| Databáze: | OpenAIRE |
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