Luminescence in Er3+ co-doped bismuth germinate glass–ceramics for blue and green emitting applications |
I. Kashif2, A. Ratep1 |
1Faculty of Women for Art, Science and Education, Department of Physics, Ain Shams University, Heliopolis, Cairo, Egypt 2Faculty of Science, Department of Physics, Al-Azhar University, Nasr City, Cairo, Egypt |
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Received: August 19, 2022; Revised: November 25, 2022 Accepted: December 18, 2022. Published online: January 9, 2023. |
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ABSTRACT |
Glass samples with the composition 40 Bi2O3 -60 GeO2-x Er2O3 are prepared using the melt quenching procedure. Fouriertransform infrared spectroscopy (FTIR), differential thermal analysis (DTA), Ultraviolet/Visible/Near-infrared (UV/Vis–NIR) absorption, photoluminescence spectroscopy (PL), and X-ray diffraction (XRD) are used to characterize the glass and glass– ceramic materials. The glass transition and crystallization temperatures are determined. Crystallization kinetics was studied in non-isothermal conditions. The oscillator strengths and Judd–Ofelt parameters (Ω2, Ω4, Ω6) for reported Er3+ absorption transitions are estimated, and they follow the trend Ω2 > Ω6 > Ω4 for observed Er3+ absorption transitions. The iconicity of glass samples was unaffected by an increase in Er3+ ions. XRD and FTIR confirmed the formation of the Bi4Ge3O12 phase after heat treatment of glass samples at the crystallization temperature. The CIE chromaticity diagram computes the CIE chromatic coordinates. The values for all glass and crystal samples are close to bright blue and green. Glass and glass ceramic samples are suitable for green and blue optoelectronics device applications. |
Key words:
Glass · Ceramic · Infrared (IR) spectroscopy · Differential thermal analysis (DTA) · Luminescence · Optical properties · X-ray diffraction (XRD) |
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