Excitation expansion in the high‐energy UV region for Dy3+‐doped medium‐temperature molten silicate glass phosphors

Abstract Medium‐temperature molten Dy 3+ ‐doped silicate (LNKBAS) glass phosphors can be excited efficiently in the low‐energy ultraviolet region (UVA). To this end, the addition of sensitizers Sb 3+ and Ce 3+ expands the validly excitable wavelength of Dy 3+ from 348 to 248 nm. Fluorescence spectra demonstrate the superposition effect of the sensitization in the high‐energy ultraviolet region (UVC), and the multiplicative effect of sensitization in the UVA and medium‐energy ultraviolet region (UVB) for Sb 3+ –Ce 3+ –Dy 3+ tri‐doped LNKBAS glass phosphors. The chromaticity coordinate of LNKBASCe 0.04 Sb 0.1 Dy 1.0 is (0.2725, 0.3031) at 248 nm excitation, and the sensitization coefficient of LNKBASCe 0.04 Sb 0.2 Dy 1.0 reaches at 19.85 under 309 nm excitation. Static fluorescence photographs and dynamic fluorescence video reveal the excitation expansion and the multiplicative effect of sensitization to Dy 3+ by adding sensitizers at a macroscopic level. In general, the ideal rare‐earth energy conversion in medium‐temperature molten silicate glass phosphors offers promising prospects for saving energy and manufacturing high‐quality optoelectronic devices.