Fig. 1: Variable luminescence from lanthanide activator ions upon different excitation conditions. | Nature Communications

Fig. 1: Variable luminescence from lanthanide activator ions upon different excitation conditions.

From: Excitation energy mediated cross-relaxation for tunable upconversion luminescence from a single lanthanide ion

Fig. 1

a Scheme for the energy migration process in the nanoparticles upon changing excitation wavelength (λ), pulse frequency (f), and laser power (P). b Energy absorption of 808 nm at the outmost layer and migration in the middle layer influence the CR efficiency between activator ions and modulator ions in the core nanocrystal. Migrating layer plays as an energy valve to control energy transition from the outer layer to the core layer.

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