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. Author manuscript; available in PMC: 2008 Sep 19.
Published in final edited form as: J Am Chem Soc. 2006 Apr 5;128(13):4303–4309. doi: 10.1021/ja0567642

Figure 4.

Figure 4

Fluorescence switching. Fluorescence of 7.0 nM 68 nm photochromic nanoparticles under 420 nm excitation is switched on and off with alternating UV and visible irradiation, as described in the text. The fluorescence intensity reaches maximal intensity in 20 s under 2.8 × 10−9 einstein excitation, whereas it takes 20 min to switch off fluorescence at ambient conditions and this can be accelerated with stronger visible light illumination (see text).