Reddish-orange Emission in Pr3+-V4+ Doped Ions in Calcium Lead Borosilicate Glasses for Photonics and Sensor Applications

Abstract

CaO-PbO-B2O3-SiO2:Pr2O3-V2O5 synthetic glasses were made using a traditional melt-quench method. In the UV-vis-NIR range, the optical absorption spectra show distinct transitions from different energy levels where simple Pr3+ ions are present. The absorption transition of V⁴⁺ ion identity exhibit ²T_2g®²E_2g (spin-allowed) single transition in the UV-vis region Because of the presence of the paramagnetic VO2+ ion, the EPR spectra showed high intensity hyperfine splitting of two sets of eight lines that were equally spaced apart. The evaluated g-factor in EPR spectra shows a centred at g≈ 1.9857. The FTIR studies revels the presence of borosilicate structural vibrations (SiO₄, BO₃ and BO₄) are identified in the prepared glass samples. Seven emission transitions are visible in the PL spectra as a result of the intra configurational f2-f2 of Pr3+ ions. The luminescence spectra of glass containing V4+ ions showed an emission transition with an octahedral geometry of 2E2g₨2T2g. The glass samples co-doped with V4+-Pr3+ ions showed multiple emission transitions. 3P03H6 (625 nm) are found to be notable emission transitions among all the emission transitions. The strength of the 3P0₨3H6 emission transition was found to increase several times when the concentration of V4+ ions in glass was gradually raised. Based on the quantitative analysis of these data, it was determined that at concentrations of 1.0%, there is a progressive rise in the efficient energy transfer from octahedral V4+Pr3+ ions (3d1, 4f2). Finally, it is concluded that the preferable PrV1.0 glass for getting highest efficient luminescence of Pr³⁺ ions due to energy transfer of metal-to-metal ntervalence charge transfer state (d¹ ® f²).