Fig. 2: The mechanism of reversible mechanochromism in EuWO4 phosphors. | Nature Communications

Fig. 2: The mechanism of reversible mechanochromism in EuWO4 phosphors.

From: Force-light-heat stimulation-induced multicolor chromism and multifunctional applications of europium tungstate phosphor

Fig. 2

Eu 3 d a, W 4 f b, and O 1 s c high-resolution X-ray photoelectron spectra (XPS) spectra of the original, mechnochromic (17 MPa and 30 MPa for 10 min), and fully bleached EuWO4. d Eu L-edge X-ray Absorption Near-Edge Structure (XANES) spectra of the EWO-A, EWO-B, purchased EuO, and commercial Eu2O3. Enlarge figures correspond to the pre-edge and white lines of the EWO-A and EWO-B. The right panel is the average valence calculation for the Eu element based on white-line energy. e W L-edge XANES spectra of the EWO-A, EWO-B, tungsten foil, and standard WO3. The right panel is the average valence calculation for the W element using the integral area of the white line. f The schematic diagram of the pressure-induced coloration in EuWO4.

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