Fig. 4: Fluorescence spectra of NBFYE HNPs synthesized by adding 1.5 g PAA and 5 mL H2O to the reaction system under 980 nm irradiation. | Light: Science & Applications

Fig. 4: Fluorescence spectra of NBFYE HNPs synthesized by adding 1.5 g PAA and 5 mL H2O to the reaction system under 980 nm irradiation.

From: Hollow nanoparticles synthesized via Ostwald ripening and their upconversion luminescence-mediated Boltzmann thermometry over a wide temperature range

Fig. 4

a UCL and (b) NIR-II spectra (P = 4.85 W cm−2). c UCL spectra with excitation laser power between 4.13 W cm−2 and 13.73 W cm−2. d Pump power dependence of UCL intensity. Time-resolved fluorescence decays of Er3+ ions emission at (e) 525 nm and (f) 544 nm

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