Dy³⁺ doped borate glasses for laser illumination

Intense multi-peak warm yellowish-white fluorescence emissions of Dy³⁺ are exhibited in alkaline-earth borate glasses under the excitation of a blue laser. The net emission power and net emission photon number are identified to be 498.23μW and 14.28 × 10¹⁴cps, respectively, and the quantum yield is as high as 23.10% in 2.0wt% Dy₂O₃ doped alkalineearth borate glass under the excitation of a 453nm blue laser with 14.13mW power. Anticipation of fluorescence color reveals that white luminescence can be achieved when the intensity ratio between residual laser light and Dy³⁺ emission reaches the appropriate range. By the introduction of Ce³⁺, the excitation wavelength range and the emission intensity of Dy³⁺ in alkaline-earth borate glasses are expanded to UVB region and improved by a maximum sensitization factor of 38.2, respectively, demonstrating the utilizability of a UV pumping laser for Ce³⁺-Dy³⁺ codoped alkaline-earth borate glasses. Efficient fluorescence emission and realizable white lighting in Dy³⁺ doped alkaline-earth borate glasses under the laser excitation will promote the development of laser illumination devices.