Fig. 2 | Nature Communications

Fig. 2

From: Low irradiance multiphoton imaging with alloyed lanthanide nanocrystals

Fig. 2

Enhancement of single UCNP emission. a Single-particle emission (496–745 nm) as a function of Er3+ content. Blue and red circles are 8 nm NaY(0.8−x)ErxYb0.2F4 cores and with 4 nm shells, respectively. Blue and red squares are NaErF4 and NaErF4 core/shells, respectively. Excitation density is 2 × 106 W cm−2. Error bars are one standard deviation from the mean (n ≥ 50). b Laser intensity-dependent effects of inert shell thickness on single NaYb0.4Er0.6F4 aUCNP emission

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