Optical, emission, and excitation dynamics of Eu3+‐doped bismuth‐based phosphate glass for visible display laser applications

• Published in: Luminescence (Chichester, England) England), 2023-01, Vol.38 (1), p.71-82
• Main Authors: Babu, P. Reddi, Gelija, Devarajulu, Pasupuleti, Kedhareswara Sairam, Kumar, B. Kiran, Sushma, N. John, Kim, Moon‐Deock, Raju, B. Deva Prasad
• Format: Article
• Language: English
• Subjects: Bismuth; Chromaticity; Emission analysis; Emission spectra; Emissions; Eu3+ ions; Europium; Excitation spectra; Fourier transforms; Glass; Infrared spectra; J–O parameters; Laser applications; Lasers; Mathematical analysis; Parameters; Phosphate glass; Phosphates; Phosphorus pentoxide; Photoluminescence; Photons; Probability theory; Radiative lifetime; radiative parameters; Spectra; Spectral emissivity; Temperature dependence; Transition probabilities; visible lasers; Xenon; Xenon lamps
• ISSN: 1522-7235; 1522-7243
• DOI: 10.1002/bio.4422

Eu3+‐doped‐bismuth‐based phosphate glasses with chemical equation (60 − x)P2O5–20Bi2O3−10Na2CO3–10SrF2–xEu2O3 (PBNSEu), (where x = 0, 0.1, 0.5, 1.0, 1.5 and 2 mol%) were fabricated using the melt‐quenching method. Obtain X‐ray diffraction (XRD), energy‐dispersive X‐ray (EDAX), and Fourier transform infrared (FTIR) spectra were used to characterize the structure of the prepared PBNSEu glass. The J–O (Judd–Ofelt) intensity parameters (Ω2, Ω4) were estimated using photoluminescence emission spectra. When excited with a xenon lamp at λexc = 394 nm, the most intense red‐emission transition occurred at ~612 nm (5D0→7F2). J–O intensity parameters were used to calculate radiative properties, whereas the radiative branching ratio (βR), radiative transition probability (AR), radiative lifetime (τR), and total radiative transition rate (Aτ) were calculated for the transitions 5D0→7FJ (where J = 0–4) and were obtained in the emission spectra for europium ion‐doped in the current glass. Using the CIE1931 chromaticity coordinates axes, the colours of various concentrations of Eu3+ ion‐doped PBNS glass were evaluated using the emission spectra. Temperature‐dependent luminescence spectra were recorded for the optimized PBNSEu20 glass to calculate the activation energy. These results strongly suggested red components in w‐LEDs and visible display laser applications. The graphical depicts the emission spectra of the PBNSEu glass that were studied in the spectral range 560–720 nm at room temperature. Peak positions are found at 578, 592, 612 and 653 nm, and 702 nm, respectively. The transition 5D0→7F2 (612 nm) was the highest intensity peak compared with other transitions.