Fig. 4 | Nature Communications

Fig. 4

From: Low irradiance multiphoton imaging with alloyed lanthanide nanocrystals

Fig. 4

Multiphoton imaging at low irradiance. ad Images of single core/shell 8-nm NaEr0.2Yb0.8F4 aUCNPs (red dashed circle) and 8-nm NaYF4: 20% Yb3+, 20% Er3+ UCNPs (white dashed circles), with emission intensity scale in c.p.s. next to each image. Scale bar is 1 μm. e Linecuts of single NaEr0.2Yb0.8F4 core/shell aUCNP at 375 W cm−2 (red circle) and NaYF4: 20% Yb3+, 20% Er3+ UCNP at 30,000 W cm−2 (green circle). fi Images in 0.5-μm polystyrene beads loaded with ensembles of UCNPs (compositions as in ad). j Brightfield image of the two beads in fi, with 980-nm laser focused at the X

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