Figure 3 | Scientific Reports

Figure 3

From: Controllable optical modulation of blue/green up-conversion fluorescence from Tm3+ (Er3+) single-doped glass ceramics upon two-step excitation of two-wavelengths

Figure 3

UC fluorescence spectra of Tm3+ (a) and Er3+ (c) single-doped GCs at room temperature following single-wavelength excitation, and two-step excitation of two-wavelengths. Fluorescence images of Tm3+ (b) and Er3+ (d) single-doped GCs with and without one NIR laser power fixed and increasing power of another NIR laser marked by arrows. “+” denotes excitation combined with another NIR laser of fixed power. “−” denotes excitation combined without another NIR laser.

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