Eu³⁺ ions doped lithium aluminium gadolinium borophosphate glasses: Energy transfer, optical and luminescence behaviors for red emission material

Eu³⁺ ions doped Li₂O–Al₂O₃–Gd₂O₃–B₂O₃–P₂O₅ glasses have been prepared by melt quenching and characterized for their physical, optical and luminescence properties. Judd-Ofelt (JO) theory is used to evaluate the oscillator strengths and the three intensity parameters (Ω_λ, λ = 2, 4 and 6) of the glasses. The radiative properties such as radiative transition probabilities (A_R), radiative lifetimes (τ), branching ratios (β) and emission cross-section (σ_e) have been calculated from the absorption spectra according to the JO theory. The scintillation properties of glasses could be measured by comparing emission spectrum under the X-ray induced luminescence with bismuth germanate (BGO). The Commission Internationale de l'Elcairage (CIE) chromaticity coordinates (x,y) were also evaluated from the emission spectra of glasses and values of glasses take part in the red region.