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Comparative study of Eu3+ doped calcium borate glasses and crystalline calcium hexaborate phosphors.

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Title: Comparative study of Eu3+ doped calcium borate glasses and crystalline calcium hexaborate phosphors.
Authors: Sharma, Suruchi1 (AUTHOR), Middha, Shiffali1 (AUTHOR), Khanna, Atul1 (AUTHOR) atul.phy@gndu.ac.in, Chen, Benjamin2 (AUTHOR), Chen, Banghao2 (AUTHOR)
Source: Journal of Materials Science: Materials in Electronics. Jan2024, Vol. 35 Issue 2, p1-19. 19p.
Abstract: Calcium borate glasses and crystalline calcium hexaborate phosphors were prepared by doping with varying concentration of Eu2O3. Crystalline samples of composition: (100−x)CaB6O10-xEu2O3 (x = 0 to 5 mol%) and their analogous glass samples of composition: (25−0.25x)CaO-(75−0.75x)B2O3-xEu2O3 (x = 0 to 5 mol %) were prepared by solid-state reaction and melt-quenching techniques respectively. The samples were characterized by X-ray diffraction (XRD), differential scanning calorimetry, Raman, Fourier transform infrared, photoluminescence (PL) and the 11B Magic Angle Spinning (MAS) and Nuclear Magnetic Resonance (NMR) spectroscopy. A comparison was made between the light emission properties of crystalline and glassy borate phosphors. Rietveld analysis of XRD patterns confirm the monoclinic structure of calcium hexaborates. The density of glasses increases from 2.42 to 3.04 g cm−3 and the glass transition temperature increases from 727 to 751 °C with an increase in concentration of Eu2O3 from 0 to 5-mol%. Raman and FTIR studies show vibration modes in tri, hexa and pentaborate anions containing [BO4] and [BO3] structural units in crystalline and glass samples. The concentration of tetrahedral borons in the undoped 25CaO–75B2O3 glass and crystalline CaB6O10 was found to be 37 and 35% respectively. Eu2O3 doped calcium borate glasses emit intense red color while the crystalline calcium hexaborates emit whitish-blue color at an excitation wavelength of 392 nm. The emission of bluish light in Eu doped crystalline calcium hexaborates reveals that partial reduction of Eu3+ into Eu2+ takes place in the crystalline sample. In both glass and crystalline samples, the PL intensity increases with an increase in concentration of Eu2O3 from 1 to 4 mol%, while at 5 mol% Eu2O3 concentration, quenching of luminescence is observed. The luminescence intensity of glasses is found to be significantly higher than that of crystalline samples. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Comparative study of Eu<superscript>3+</superscript> doped calcium borate glasses and crystalline calcium hexaborate phosphors.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%3A+Materials+in+Electronics%22">Journal of Materials Science: Materials in Electronics</searchLink>. Jan2024, Vol. 35 Issue 2, p1-19. 19p.
– Name: Abstract
  Label: Abstract
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  Data: Calcium borate glasses and crystalline calcium hexaborate phosphors were prepared by doping with varying concentration of Eu2O3. Crystalline samples of composition: (100−x)CaB6O10-xEu2O3 (x = 0 to 5 mol%) and their analogous glass samples of composition: (25−0.25x)CaO-(75−0.75x)B2O3-xEu2O3 (x = 0 to 5 mol %) were prepared by solid-state reaction and melt-quenching techniques respectively. The samples were characterized by X-ray diffraction (XRD), differential scanning calorimetry, Raman, Fourier transform infrared, photoluminescence (PL) and the 11B Magic Angle Spinning (MAS) and Nuclear Magnetic Resonance (NMR) spectroscopy. A comparison was made between the light emission properties of crystalline and glassy borate phosphors. Rietveld analysis of XRD patterns confirm the monoclinic structure of calcium hexaborates. The density of glasses increases from 2.42 to 3.04 g cm−3 and the glass transition temperature increases from 727 to 751 °C with an increase in concentration of Eu2O3 from 0 to 5-mol%. Raman and FTIR studies show vibration modes in tri, hexa and pentaborate anions containing [BO4] and [BO3] structural units in crystalline and glass samples. The concentration of tetrahedral borons in the undoped 25CaO–75B2O3 glass and crystalline CaB6O10 was found to be 37 and 35% respectively. Eu2O3 doped calcium borate glasses emit intense red color while the crystalline calcium hexaborates emit whitish-blue color at an excitation wavelength of 392 nm. The emission of bluish light in Eu doped crystalline calcium hexaborates reveals that partial reduction of Eu3+ into Eu2+ takes place in the crystalline sample. In both glass and crystalline samples, the PL intensity increases with an increase in concentration of Eu2O3 from 1 to 4 mol%, while at 5 mol% Eu2O3 concentration, quenching of luminescence is observed. The luminescence intensity of glasses is found to be significantly higher than that of crystalline samples. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              M: 01
              Text: Jan2024
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