Fig. 4.
Multiphoton scanning images of 975 nm excited Yb-UCNPs at (a) 2 µs/pixel, (c) 40 µs/pixel, and 795 nm excited Nd-UCNPs at (b) 2 µs/pixel and (d) 8 µs/pixel. (e) Lifetime measurements of two samples in (c) and (d).
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