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Browsing by Author Tran, Ngoc

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  • A Luminescence Properties of Tb, SmCo-doped in Alkali Aluminoborate Glasses.pdf.jpg
  • Article

  • Luminescence Properties of Tb, SmCo-doped in Alkali Aluminoborate Glasses

    • Authors: Tran, Ngoc; Phan, Thi Hoai Thương; Hoang, Sy Tai (2019)

  • Spectroscopic properties of Tb3+ and Sm3+ ions co-doped in alkali aluminoborate glasses (70-x-y)B2O3.28Li2O.2Al2O3.xSm2O3.yTb2O3 (ABL:Tb, Sm) fabricated by melting method have been studied. The emission intensity of Tb3+ or Sm3+ in ABL:Tb or ABL:Sm glasses is influenced by the Tb3+ or Sm3+doping concerning with the 0.75 mol% and 1.0 mol% optimum concentrations, respectively. The concentration quenching effect of Tb3+ or Sm3+ in ABL:Tb, Sm glasses is observed. The mechanism of this phenomenon is attributed to the f-f intersaction for either Tb3+/Sm3 . The ABL:Tb, Sm glasses can produce color emission from green to red by properly tuning the relative ratio between Tb3+ and Sm3+. The emi...
  • 39.pdf.jpg
  • Article

  • Optical Properties of Dy3+ and Ce3+ in Borate Glass

    • Authors: Tran, Ngoc (2015)

  • Spectroscopic properties of Dy3+ and Ce3+ ions doped alkali metal borate glasses (70-x-y)B2O3.15Li2CO­­3.15Na2CO3.xDy2O3 and yCeO2 (BLN:Dy,Ce) fabricated by melting method have been studied. Energy transfer from the absorption and fluorescence center has been discussed. Judd–Ofelt (J-O) theory has been used to evaluate various spectroscopic properties such as oscillator strengths (fexp, fcal), intensity parameters Ωl(l=2,4,6), spontaneous transition probabilities (AR), radiative life times (tR) and luminescence branching ratios (σexp, σR). The cross-relaxation mechanism was discussed for BLN glass.
  • 66.pdf.jpg
  • Article

  • Optical Properties of Sm3+ ions in Borate Glass

    • Authors: Tran, Ngoc; Vu, Phi Tuyen; Pha, Van Do (2014)

  • Samarium doped B2O3-Na2O-Li2O (BNaLi) [u1] glasses with concentration of 0.5 mol% were prepared by the conventional melting procedure. Optical absorption, excitation, luminescence spectra and lifetime have been measured at room temperature. Judd – Ofelt (JO) theory is used to study the spectral properties and to calculate the radiative transition probabilities. The predicted[u2] branching ratios (βR), radiative lifetime (ιR) and stimulated emission cross-sections [u3] (σ(λp)) of the 4G5/2 excited level are reported.

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Browsing by Author Tran, Ngoc

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 1 to 3 of 3
  • A Luminescence Properties of Tb, SmCo-doped in Alkali Aluminoborate Glasses.pdf.jpg
  • Article

  • Luminescence Properties of Tb, SmCo-doped in Alkali Aluminoborate Glasses

    • Authors: Tran, Ngoc; Phan, Thi Hoai Thương; Hoang, Sy Tai (2019)

  • Spectroscopic properties of Tb3+ and Sm3+ ions co-doped in alkali aluminoborate glasses (70-x-y)B2O3.28Li2O.2Al2O3.xSm2O3.yTb2O3 (ABL:Tb, Sm) fabricated by melting method have been studied. The emission intensity of Tb3+ or Sm3+ in ABL:Tb or ABL:Sm glasses is influenced by the Tb3+ or Sm3+doping concerning with the 0.75 mol% and 1.0 mol% optimum concentrations, respectively. The concentration quenching effect of Tb3+ or Sm3+ in ABL:Tb, Sm glasses is observed. The mechanism of this phenomenon is attributed to the f-f intersaction for either Tb3+/Sm3 . The ABL:Tb, Sm glasses can produce color emission from green to red by properly tuning the relative ratio between Tb3+ and Sm3+. The emi...
  • 39.pdf.jpg
  • Article

  • Optical Properties of Dy3+ and Ce3+ in Borate Glass

    • Authors: Tran, Ngoc (2015)

  • Spectroscopic properties of Dy3+ and Ce3+ ions doped alkali metal borate glasses (70-x-y)B2O3.15Li2CO­­3.15Na2CO3.xDy2O3 and yCeO2 (BLN:Dy,Ce) fabricated by melting method have been studied. Energy transfer from the absorption and fluorescence center has been discussed. Judd–Ofelt (J-O) theory has been used to evaluate various spectroscopic properties such as oscillator strengths (fexp, fcal), intensity parameters Ωl(l=2,4,6), spontaneous transition probabilities (AR), radiative life times (tR) and luminescence branching ratios (σexp, σR). The cross-relaxation mechanism was discussed for BLN glass.
  • 66.pdf.jpg
  • Article

  • Optical Properties of Sm3+ ions in Borate Glass

    • Authors: Tran, Ngoc; Vu, Phi Tuyen; Pha, Van Do (2014)

  • Samarium doped B2O3-Na2O-Li2O (BNaLi) [u1] glasses with concentration of 0.5 mol% were prepared by the conventional melting procedure. Optical absorption, excitation, luminescence spectra and lifetime have been measured at room temperature. Judd – Ofelt (JO) theory is used to study the spectral properties and to calculate the radiative transition probabilities. The predicted[u2] branching ratios (βR), radiative lifetime (ιR) and stimulated emission cross-sections [u3] (σ(λp)) of the 4G5/2 excited level are reported.