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Browsing by Author Phan, Van Do

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  • 55.pdf.jpg
  • Article

  • Energy transfer studies of Dy3+ ions doped K2GdF5 crystal

    • Authors: Vu, Phi Tuyen; Phan, Van Do; N.M., Khaidukov; Nguyen, Trong Thanh (2012)

  • Dy3+ -doped K2GdF5 single crystals were synthesized under hydrothermal condition. The UV excitation spectra and lifetimes of K2GdF5:Dy3+ were measured at room temperature. The excitation spectra have shown charge transfer state (CTS) of Dy3+ and energy transfer from Gd3+ to Dy3+ ions in K2GdF5:Dy3+ crystal. The decay curve of the K2GdF5 sample doped with 5.0 mol % Dy3+ ions is a non – exponential curve and is well fitted to the Inokuti – Hirayama model for S = 6. The energy transfer parameters (Q, CDA) and the critical distance (R0) are calculated.
  • Investigation on Structure of TeO2-B2O3-SiO2-Al2O3-KF Glasses.pdf.jpg
  • Article

  • Investigation on structure of TeO2-B2O3-SiO2-Al2O3-KF glasses

    • Authors: Phan, Van Do (2020)

  • Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction (XRD) patterns. Effect of B2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy (FTIR) spectra. Optical band gap and Urbach energy were found from analysis of optical absorption spectra. Thermal studies were carried out by using Differential thermal analyzer (DTA) measurements.
  • 4358-97-9273-1-10-20191217.pdf.jpg
  • Article

  • Optical Properties and White Light Emission of Dy3+ Doped Alumino Borotellurite Glasses

    • Authors: Phan, Van Do (2019)

  • Dy3+ doped alumino borotellurite (ABT) glasses xB2O3+(80-x)TeO2+10Al2O3+10CaO+ 0.5Dy2O3 (where x = 35; 45 and 55) have been prepared by melting method. Their optical properties were studied through absorption, luminescence spectra and decay time measurements. Judd-Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) have been determined using absorption spectra and are been used to calculate the radiative parameters like transition probability, stimulated emission cross-section, branching ratios, gain band width and optical gain for the 4F9/2→6H13/2 transition in Dy3+ ions. The chromaticity coordinates is used to estimate the emission feature of prepared glasses
  • 49.pdf.jpg
  • Article

  • Predict optical properties of Dy3+ ions doped double potassium gadolinium fluoride crystal from absorption spectra

    • Authors: Phan, Van Do; Vu, Phi Tuyen; N. M., Khaidukov; Nguyen, Trong Thanh (2012)

  • Double potassium gadolinium fluoride crystal doped with 5.0 mol % of Dy3+ ions (K2GdF5:Dy3+) was synthesized under hydrothermal condition. The absorption, luminescence spectra and lifetime of K2GdF5:Dy3+ sample were measured at room temperature. Judd – Ofelt (JO) theory is used to study the spectral properties and to calculate the radiative transition probabilities. The prediced branching ratios (βR), radiative lifetime (ιR), integrated emission cross – section (Σif) and stimulated emission cross – sections (σ(λp)) of the 4F9/2 excited level are reported.[u1]
  • 4258-97-8272-1-10-20180320.pdf.jpg
  • Article

  • Sm3+ Doped Borotellurite Glass: Absorption, Fluorescence and Optical Parameters

    • Authors: Phan, Van Do (2018)

  • Borotellurite glasses doped with Sm3+ ions were prepared by a melt–quenching technique. The studies on optical characterization of Sm3+ ions have been carried out through absorption, emission and decay spectra. Judd-Ofelt (JO) intensity analysis has been presented and JO parameters were calculated for Sm3+ ions in borotellurite glasses. Radiative properties such as transition probabilities, branching ratios, radiative lifetime of 4G5/2 level and quantum efficiency were estimated by using JO parameters.
  • 4284-97-8420-1-10-20180924.pdf.jpg
  • Article

  • The Studies of Energy Transfer between Sm3+ ions in Lead Sodium Telluroborate Glasses Using Inokuti-Hirayama Model

    • Authors: Phan, Van Do (2018)

  • Lead sodium telluroborate (LSTB) glasses doped with different concentrations of Sm3+ ions were prepared by melting method. The excitation, emission spectra and lifetimes of LSTB:Sm3+ have been investigated. The quenching of luminescence intensity happens after 0.75 mol% concentration of Sm3+ ions. The non-exponential decay curves are fitted to the Inokuti and Hirayama model to give the energy transfer parameters between Sm3+ ions. The dominant interaction mechanism for energy transfer process is dipole–dipole interaction. The energy transfer probability (WDA) increases whereas lifetime (τexp) decreases with the increase of Sm3+ concentration in glass.

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Browsing by Author Phan, Van Do

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 7 of 7
  • 55.pdf.jpg
  • Article

  • Energy transfer studies of Dy3+ ions doped K2GdF5 crystal

    • Authors: Vu, Phi Tuyen; Phan, Van Do; N.M., Khaidukov; Nguyen, Trong Thanh (2012)

  • Dy3+ -doped K2GdF5 single crystals were synthesized under hydrothermal condition. The UV excitation spectra and lifetimes of K2GdF5:Dy3+ were measured at room temperature. The excitation spectra have shown charge transfer state (CTS) of Dy3+ and energy transfer from Gd3+ to Dy3+ ions in K2GdF5:Dy3+ crystal. The decay curve of the K2GdF5 sample doped with 5.0 mol % Dy3+ ions is a non – exponential curve and is well fitted to the Inokuti – Hirayama model for S = 6. The energy transfer parameters (Q, CDA) and the critical distance (R0) are calculated.
  • Investigation on Structure of TeO2-B2O3-SiO2-Al2O3-KF Glasses.pdf.jpg
  • Article

  • Investigation on structure of TeO2-B2O3-SiO2-Al2O3-KF glasses

    • Authors: Phan, Van Do (2020)

  • Borotellurite glasses were prepared by melt quenching technique. Amorphous nature of samples was confirmed through X-ray diffraction (XRD) patterns. Effect of B2O3 content on the structure of glass network was studied through Fourier-transform infrared spectroscopy (FTIR) spectra. Optical band gap and Urbach energy were found from analysis of optical absorption spectra. Thermal studies were carried out by using Differential thermal analyzer (DTA) measurements.
  • 4358-97-9273-1-10-20191217.pdf.jpg
  • Article

  • Optical Properties and White Light Emission of Dy3+ Doped Alumino Borotellurite Glasses

    • Authors: Phan, Van Do (2019)

  • Dy3+ doped alumino borotellurite (ABT) glasses xB2O3+(80-x)TeO2+10Al2O3+10CaO+ 0.5Dy2O3 (where x = 35; 45 and 55) have been prepared by melting method. Their optical properties were studied through absorption, luminescence spectra and decay time measurements. Judd-Ofelt (JO) intensity parameters (Ωλ, λ = 2, 4 and 6) have been determined using absorption spectra and are been used to calculate the radiative parameters like transition probability, stimulated emission cross-section, branching ratios, gain band width and optical gain for the 4F9/2→6H13/2 transition in Dy3+ ions. The chromaticity coordinates is used to estimate the emission feature of prepared glasses
  • 49.pdf.jpg
  • Article

  • Predict optical properties of Dy3+ ions doped double potassium gadolinium fluoride crystal from absorption spectra

    • Authors: Phan, Van Do; Vu, Phi Tuyen; N. M., Khaidukov; Nguyen, Trong Thanh (2012)

  • Double potassium gadolinium fluoride crystal doped with 5.0 mol % of Dy3+ ions (K2GdF5:Dy3+) was synthesized under hydrothermal condition. The absorption, luminescence spectra and lifetime of K2GdF5:Dy3+ sample were measured at room temperature. Judd – Ofelt (JO) theory is used to study the spectral properties and to calculate the radiative transition probabilities. The prediced branching ratios (βR), radiative lifetime (ιR), integrated emission cross – section (Σif) and stimulated emission cross – sections (σ(λp)) of the 4F9/2 excited level are reported.[u1]
  • 4258-97-8272-1-10-20180320.pdf.jpg
  • Article

  • Sm3+ Doped Borotellurite Glass: Absorption, Fluorescence and Optical Parameters

    • Authors: Phan, Van Do (2018)

  • Borotellurite glasses doped with Sm3+ ions were prepared by a melt–quenching technique. The studies on optical characterization of Sm3+ ions have been carried out through absorption, emission and decay spectra. Judd-Ofelt (JO) intensity analysis has been presented and JO parameters were calculated for Sm3+ ions in borotellurite glasses. Radiative properties such as transition probabilities, branching ratios, radiative lifetime of 4G5/2 level and quantum efficiency were estimated by using JO parameters.
  • 4284-97-8420-1-10-20180924.pdf.jpg
  • Article

  • The Studies of Energy Transfer between Sm3+ ions in Lead Sodium Telluroborate Glasses Using Inokuti-Hirayama Model

    • Authors: Phan, Van Do (2018)

  • Lead sodium telluroborate (LSTB) glasses doped with different concentrations of Sm3+ ions were prepared by melting method. The excitation, emission spectra and lifetimes of LSTB:Sm3+ have been investigated. The quenching of luminescence intensity happens after 0.75 mol% concentration of Sm3+ ions. The non-exponential decay curves are fitted to the Inokuti and Hirayama model to give the energy transfer parameters between Sm3+ ions. The dominant interaction mechanism for energy transfer process is dipole–dipole interaction. The energy transfer probability (WDA) increases whereas lifetime (τexp) decreases with the increase of Sm3+ concentration in glass.