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A photograph of a proton-based EC device in the colored state, showing a letter E written by an UV laser.
(a) Transmission spectra of the device shown in Fig. 1 in the colored and bleached states measured before (solid lines) and after (dotted lines) UV illumination; (b) relative changes in the transmission.
A conceptual schematic of the UPM effect. Dashed (red) lines graphically represent the proton concentration profiles in the and layers. UV photochromic irradiation creates a high concentration of species in the irradiated area, which enhances EC coloration and decoloration.
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