White Light Emission and Judd-Ofelt Analysis of Dy³⁺ Doped Mixed Alkali Borate Glass for W-LEDs Material

The Dy³⁺ doped lithium sodium potassium borate glasses with white light-emitting were prepared by the melt quenching technique. In this work, optical, photoluminescence properties and Judd-Ofelt analysis of borate glasses have been investigated. For optical properties, Dy³⁺ doped glasses showed the absorption in visible and near-infrared region, which originate from ⁶H_15/2 ground state to higher state. While the luminescence properties of Dy³⁺ doped glasses, the emission spectra were presented more intense at 484 nm (blue light) and 574 nm (yellow light) which are essential for white light emitting materials, whilst decay time decrease with an increase of Dy₂O₃ contents. The emission intensity of Dy³⁺ doped glasses were enhanced by adding Dy₂O₃ concentrations until 0.5 mol%, after that the emission intensities were decreased due to the concentration quenching effect. Judd-Ofelt is analyzed by using the absorption and photoluminescence results, The stimulated emission cross-section has been investigated in this work. The CIE 1931 chromaticity investigation shows that Dy³⁺ doped glass emitted light with white color. Hence, these glasses may be suitable candidates for use in W-LEDs material.