Fig. 1: Multi-wavelength-responsive UCNCs. | Light: Science & Applications

Fig. 1: Multi-wavelength-responsive UCNCs.

From: Huge upconversion luminescence enhancement by a cascade optical field modulation strategy facilitating selective multispectral narrow-band near-infrared photodetection

Fig. 1

a TEM image of NaYF4:20% Yb3+, 2%Er3+@NaYF4@NaYF4:20% Yb3+, 20% Nd3+, 0.2% Tm3+ CSS UCNCs. b Line-scan elemental mapping curves of a single NaYF4:20% Yb3+, 2% Er3+@NaYF4@NaYF4:20% Yb3+, 20% Nd3+, 0.2% Tm3+ CSS NC. c Upconversion emission spectra of CSS UCNCs recorded under 808, 980 and 1540 nm laser excitation. (Inset) Corresponding photos of the CSS UCNC films upon illumination with three kinds of lasers. d Energy-transfer upconversion processes in Nd3+-, Yb3+-, Er3+-, and Tm3+-codoped CSS UCNCs

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