Luminescence and radiative features of Gd2O3 modified and Pr3+ doped borate glass via energy transfer from Gd to Pr for blue- and UV-excited WLEDs

We investigate the XRD , FTIR, structure variation factors, optical absorption , luminescence and radiative behaviors of mixed Gd 2 O 3 in a 20Li 2 O 3 -30SrO-(49-x)B 2 O 3 -xGd 2 O 3 -1Pr 2 O 3 glass. The Judde-Ofelt (J-O) analysis of the absorption spectra is performed to deduce intensity parameters. The refractive index and Ω λ = 2, 4, 6 values are employed to evaluate the branching ratios (β R ), and radiative transition probabilities (A R ) of Pr 3+ luminescent states. At a wavelength of 444 nm for optical pumping , critical factors such as significant optical gain , and gain bandwidth in the 3 P o → 3 H 4 transition for designing visible laser systems are estimated. The Gd 3+ ions sensitize the Pr 3+ ions through ET from their 6 P 7/2 state to the 3 P J = 2, 1, 0 states of Pr 3+ ions. The extracted Commission Internationale de l'Éclairage (CIE), correlated color temperature (CCT) and color purity (CP) values from the luminescence spectra demonstrate the emission of white light. These results have implications for WLEDs and optical amplification .