BRIGHT RED LUMINESCENCE EMISSION FROM PR3+ - MN2+ PAIR OF IONS DOPED IN CAO-PBO-B2O3-SIO2 GLASS WEB FOR RED LIGHT SENSORS AND LED APPLICATIONS

Abstract

The novel synthesis remote composition of CaO-PbO-B2O3-SiO2: Pr3+ -Mn2+ glasses were prepared by meltquenching technique. The absorption spectra of Pr3+ -Mn2+ co-doped ions glasses exhibits various optical transitions in Uv-vis-NIR region. The photoluminescence spectra of Pr3+ - Mn2+ pair of ions contain glasses exhibited in various luminescent transitions. Among all luminescent transitions, the high intense 3P0 → 3H6 (696 nm) was observed that fall on bright red region due to its high crystal field strength of octahedral Mn2+ sensitizer ions. The all optical absorption and luminescent transitions of Pr3+ activator ions are related to 4f2 intraconfigurational transitions. Among all prepared samples, the PrMn1.0 glass shows high luminescent energy transfer of metal (Mn2+) to metal (Pr3+) intervalence charge transfer transition of d5 → f 2 . The EPR spectra exhibited sextet signal due to presence of octahedral Mn2+ paramagnetic ions. The ɡ ≈ 2.02 shows at centre of spectrogram were identified as Mn2+ (Oh) ions. From the quantitative analysis of these results, the energy transfer transition is associated from Mn2+ donor ions to Pr3+ activator ions (Mn2+ → Pr3+). The IR spectra confirmed the presence of borosilicate molecular dynamic units. XRD analysis suggest that all glass samples are inorganic non-crystalline structure without narrow sharp peaks.