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. 2015 Jun 16;5:11423. doi: 10.1038/srep11423

Figure 1. Photoswitching of carbon dots.

Figure 1

(a) The on-off switching observed by alternating 401 nm and 639 nm laser excitation. (b) Photon counts in a hybrid photomultiplier detector show photo-decay and subsequent gain in intensity (photoswitch) using 401 laser. The blue arrow shows the 401 nm pulses (detected in channel 1) and the red bars show the photo-decay with 639 nm Laser (detected in channel 2). The 4th and 6th cycle, with a slightly higher exposure time of blue light, results a better recovery of fluorescence.