Luminescence properties of Tm 3+ /Dy 3+ co-activated borate and borophosphate glasses for near daylight w-LED and dosimetry application

The melt-quenching technique was used to synthesize Tm 3+ /Dy 3+ co-doped glasses, which were then characterized using various spectroscopic techniques. For the glasses, the direct and indirect optical band-gap energies from Tauc’s plot, as well as the Urbah energy ( E u ), were calculated. The PL emission spectra show the radiative transitions of Dy 3+ ions from 4 F 9/2 result in emissions at 484, 578, and 669 nm, and transition of Tm 3+ ions from 1 D 2 results in emissions at 452, 476, and 520 nm in Tm 3+ /Dy 3+ borate glass (TDB) and Tm 3+ /Dy 3+ borophosphate glasses (TDBP). The non-single exponential nature of the decay of the present glasses was studied by fitting with the Inokuti-Hirayama model, and the energy transfer ( Q ) and other related parameters were calculated. The results of the calculated colorimetric parameters, the value of the yellow-to-blue (Y/B) luminescence intensity ratio, and the TL kinetic parameters by the peak shape method show that both TDB and TDBP glasses are promising multifunctional materials. Graphical Abstract