FTIR, Raman and XPS Structural Studies of Bismuth Modified Phosphosilicate Glasses for Orange-Red Lighting Sources
John Reddy Vootukuru,
Manjula Kuntigorla,
Umamahesvari Hemakumar
et al.
Abstract:Bismuth-oxyfluoride glasses with the chemical composition of P2O5+NaF+SiO2+Bi2O3 (PNSiBi) have been prepared by melt-quenching method and studied their structural and thermal properties through Raman, Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) and differential thermal analysis. Moreover, elemental analysis of these glasses has been performed with energy-dispersive X-ray (EDX) spectroscopy. The glass transition and crystalline temperatures of the glasses have been estimated usi… Show more
“…Glasses doped with trivalent lanthanides are widely applied in Photonics and Optronics technologies such solid state lighting, solar energy (harvesting through photon conversion processes), lasers and laser cooling of solids applications. [1][2][3][4][5][6][7][8][9] These materials took on the ultimate importance due to their attractive, functional properties, namely the possibility of generating high fluorescence intensity, a distributed lifetime from nano to milliseconds scale, and a good monochromatic aspect for a given transition. 10 The optimization of these properties requires the appropriate choice of the lanthanide including its concentration and its ligand, and thus the glassy matrix in which is incorporated.…”
The present work focuses on the spectroscopic luminescence analysis of trivalent neodymium-doped lithium antimony-borate glasses, with the glass composition 70 Sb2O3—(25-x) B2O3–5 li2O—x Nd2O3 where x = 0.3; 0.5; 0.7 mol% (SBLN). Around 475 nm excitation used by the transition 4I9/2 → 2G9/2 + 2D3/2 + 2K15/2 and that induced emission lines of wavelengths λ
emis = 584;673;767;826 nm (red is low intensity). The specific emission follows the transitions 2G7/2 + 4G5/2 → 4IJ (J = 9/2; 11/2; 13/2; 15/2). Previous work on Nd3+ doped glasses studied near-infrared emission in 4F3/2 → 4IJ mode (J = 9/2; 11/2; 13/2) via near-infrared excitation 4I9/2 → 4F5/ 2+2H9/2. The Judd-Ofelt analysis applied to SBLN glasses showed that the ΩK parameters are consistent with the values in the literature. SBLN7 glass has the best spectroscopic factor Ω4/Ω6 = 0.974; while the best luminescence branching ratio is that of the green emission and it stands at an average β = 70%. Similarly, green emission has the best values of stimulated emission cross section and gain bandwidth. Calculated and measured lifetimes are ranged between 15 and 40 microseconds; however, quantum efficiency varies between 50 and 91%. In another side calculated and measured refractive index values are very close. The chromatic coordinates of observed green color showed accurately that lies in the yellowish-green region of the chromaticity diagram edited by CIE 1931. The calculation of its temperature was made by Mc Macy’s equation, and it is in the limits of 5100 K; which corresponds to a cool color similar to midday sunlight.
“…Glasses doped with trivalent lanthanides are widely applied in Photonics and Optronics technologies such solid state lighting, solar energy (harvesting through photon conversion processes), lasers and laser cooling of solids applications. [1][2][3][4][5][6][7][8][9] These materials took on the ultimate importance due to their attractive, functional properties, namely the possibility of generating high fluorescence intensity, a distributed lifetime from nano to milliseconds scale, and a good monochromatic aspect for a given transition. 10 The optimization of these properties requires the appropriate choice of the lanthanide including its concentration and its ligand, and thus the glassy matrix in which is incorporated.…”
The present work focuses on the spectroscopic luminescence analysis of trivalent neodymium-doped lithium antimony-borate glasses, with the glass composition 70 Sb2O3—(25-x) B2O3–5 li2O—x Nd2O3 where x = 0.3; 0.5; 0.7 mol% (SBLN). Around 475 nm excitation used by the transition 4I9/2 → 2G9/2 + 2D3/2 + 2K15/2 and that induced emission lines of wavelengths λ
emis = 584;673;767;826 nm (red is low intensity). The specific emission follows the transitions 2G7/2 + 4G5/2 → 4IJ (J = 9/2; 11/2; 13/2; 15/2). Previous work on Nd3+ doped glasses studied near-infrared emission in 4F3/2 → 4IJ mode (J = 9/2; 11/2; 13/2) via near-infrared excitation 4I9/2 → 4F5/ 2+2H9/2. The Judd-Ofelt analysis applied to SBLN glasses showed that the ΩK parameters are consistent with the values in the literature. SBLN7 glass has the best spectroscopic factor Ω4/Ω6 = 0.974; while the best luminescence branching ratio is that of the green emission and it stands at an average β = 70%. Similarly, green emission has the best values of stimulated emission cross section and gain bandwidth. Calculated and measured lifetimes are ranged between 15 and 40 microseconds; however, quantum efficiency varies between 50 and 91%. In another side calculated and measured refractive index values are very close. The chromatic coordinates of observed green color showed accurately that lies in the yellowish-green region of the chromaticity diagram edited by CIE 1931. The calculation of its temperature was made by Mc Macy’s equation, and it is in the limits of 5100 K; which corresponds to a cool color similar to midday sunlight.
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