Amplifying excitation-power sensitivity of photon upconversion in a NaYbF4:Ho nanostructure for direct visualization of electromagnetic hotspots
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 4916-4921 |
Journal / Publication | Journal of Physical Chemistry Letters |
Volume | 7 |
Issue number | 23 |
Online published | 15 Nov 2016 |
Publication status | Published - 1 Dec 2016 |
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Abstract
Controlling excitation power is the most convenient approach to dynamically tuning upconversion that is essential for a variety of studies. However, this approach suffers from a significant constraint due to insensitive response of most upconversion systems to excitation power. Here we present a study of amplifying excitation power-sensitivity of upconversion in Ho3+ ions through the use of a NaYbF4 host. Mechanistic investigation reveals that the sensitive response of Ho3+ upconversion to excitation power stems from maximal use of the incident energy enabled by concentrated Yb3+ sensitizers. This allows us to sensitively tune the red-to-green emission intensity ratio from 0.37 to 5.19 by increasing the excitation power from 1.25 to 46.25 W cm-2, which represents a 5.6-fold amplification of the tunability (from 0.19 to 0.49) offered by Yb/Ho (19/1 mol %) codoped NaYF4. Our results highlight that the excitation-power sensitive upconversion emission can be exploited to experimentally visualize electromagnetic hotspots.
Citation Format(s)
Amplifying excitation-power sensitivity of photon upconversion in a NaYbF4:Ho nanostructure for direct visualization of electromagnetic hotspots. / Chen, Bing; Liu, Yong; Xiao, Yao et al.
In: Journal of Physical Chemistry Letters, Vol. 7, No. 23, 01.12.2016, p. 4916-4921.
In: Journal of Physical Chemistry Letters, Vol. 7, No. 23, 01.12.2016, p. 4916-4921.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review