Praseodymium ion-doped boro lithium glass material for optical applications: W-LED

Boro Lithium Praseodymium glasses are prepared by the melt quench method. According to the Hruby’s Criteria value, the prepared sample possesses high thermal stability. X-ray diffraction spectra and the physical property metallization reveal the amorphous and metallic nature of the glass samples. The high density and refractive indices of these glasses substantiate their suitability for use in optical systems. FTIR characterization discloses that strong B–O–Pr and B–O–B bonding with stretches and bending are formed at various frequencies. The absorption spectra of this optical material reveal that the maximum absorption lies in the range of 588 to 620 nm. The values of direct and indirect energy band gap showed decreasing trend as the concentration levels of Praseodymium increase from 0.1 to 0.5 mol%. Wear rate, frictional force and Wicker’s micro hardness values of these glass materials suggest their utility in the applications of lasers and solar energy concentrators. Judd–Ofelt results obtained from UV–VIS absorption measurements have been applied to photoluminescence spectra to evaluate radiative properties such as transition probability (A), radiative branching ratio (β_R) and the stimulated emission cross-section (σ_e) of the emission transitions. The obtained results show that the optical properties of the glass sample BPr4 found interesting towards the applications in optical systems.. The CIE 1976 plot shows that the prepared glass sample BPr4 is capable to emit white light, so this glare is suitable for white LEDs.