Dy³⁺ doped tellurium-borate glass phosphors for laser-driven white illumination

Dy³⁺ doped multi-component tellurium-borate (MTB) glasses are identified to be an effective phosphor for laser-driven white illumination. Quantitative characterization of absolute spectrum parameter reveals that 2.0 wt% Dy₂O₃ doped MTB glass processes excellent quantum yield as high as 14.42%. The color parameters of white fluorescence are effectively emendated by adjusting the sample size and the pumping power when the preferred doping concentration is determined. The chromaticity parameters including luminous flux, color coordinate and correlated color temperature in 5.48 × 2.28 × 2.11 cm³ bulk glass phosphor are derived to 3.21 lm, (0.350, 0.331) and 4719 K closed to the pure-white fluorescence when the excitation power is enhanced to 252.7 mW. Effective white fluorescence depended on controllable photon distribution demonstrates that Dy³⁺ doped MTB glasses have promising application in developing laser-driven white light sources.