Abstract
Photochromic materials with multicolor upconversion reversible modulations are attractive in optical switching devices. Herein, the fabricated YNbO4:Er3+/Tm3+/Yb3+ materials exhibit excellent photochromism and multicolor upconversion properties from green, red to near infrared (NIR) emissions with increasing Yb concentrations. Reversible multiband upconversion modulations are achieved by alternating light (365 and 405 nm) or thermal stimuli. After 365 nm irradiation, the luminescence color changes from yellow to red, the luminescent photoswitching contrast reaches up to 86.21% (green), 82.12% (red) and 77.38% (NIR) in the Y0.83Er0.01Tm0.01NbO4:0.15 Yb sample. Besides, the upconversion emission intensity before and after photochromic reaction shows remarkable change in a wide temperature range of 298–718 K. These results indicate that the Er3+/Tm3+/Yb3+ tri-doped YNbO4 materials can be a good candidate in optical switching and data storage applications.
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