Multiplier effect of sensitization for Dy³⁺ fluorescence in borosilicate glass phosphor

Based on the demonstration of the fluorescent properties, Dy³⁺ doped borosilicate glasses (NLKSB) were confirmed to be an efficient phosphor under long-wave ultraviolet (UVA) radiation. Ce³⁺ and Sb³⁺ are introduced to the Dy³⁺ doped NLKSB glass system, which extends the excitable region to medium-wave ultraviolet (UVB) and short-wave ultraviolet (UVC) spectral ranges. Sensitization coefficient of Ce³⁺-Sb³⁺ to Dy³⁺ under different wavelengths is in accordance with the multiplication of Ce³⁺ to Dy³⁺ and Sb³⁺ to Dy³⁺, besides, this unexpected phenomenon is attributed to the effect of band superposition. The enhancement coefficient of quantum yield reaches up to 7.03 for the main emission of Dy³⁺ under the UVB-LED excitation, which indicates that multiplier effect of sensitization plays an outstanding role in macroscopic applications. The excellent sensitization effect and the effective excitability expansion provide a breakthrough in developing of high-quality lighting devices.