Limsuwan, Pichet

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Limsuwan, Pichet
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Limsuwan, P.
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Email
pichet.li@kmitl.ac.th

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    White Emission from Dy3+ Doped in ZnO–CaO–B2O3 for WLEDs Material Application
    (2022-01-01)
    Chaemlek, O.
    ;
    Kiwsakunkran, N.
    ;
    Boonpa, W.
    ;
    Wantana, N.
    ;
    Sareein, T.
    The Dy<sup>3+</sup> ions doped CaO-ZnO-B<inf>2</inf>O<inf>3</inf> glasses were synthesis by the melt quenching technique with various Dy<inf>2</inf>O<inf>3</inf> concentrations to investigation physical and optical properties. The results showed that the density and the molar volume trend to be increased along with increased Dy<sup>3+</sup> concentration. The absorption spectra showed characteristic absorption peaks in the visible and near infrared regions. Judd–Ofelt (JO) intensity parameters have been obtained from the optical absorption spectra. The emission spectra of the glasses are illustrated the highest emission intensity at 574 nm wavelength, which corresponding to Dy<sup>3+</sup> transition <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>13/2</inf> level. The decay time value decreased as the concentration of Dy<inf>2</inf>O<inf>3</inf> increased. The CIE 1931 chromaticity investigation showed that Dy<sup>3+</sup> doped glasses emitted light with white color.
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    Radio and photo luminescence properties of Dy3+ ion doped bismuth barium gadolinium borate glass
    (2023-01-01)
    Ruamnikhom, R.
    ;
    Yasaka, P.
    ;
    Boonin, K.
    ;
    Limsuwan, P.
    ;
    Kaewkhao, J.
    Investigations on physical, optical and photo – radio luminescence properties of dysprosium doped bismuth barium gadolinium borate glass (BiBaGdBDy) have been prepared for the melt at 1200 °C and rapidly cooling in the casting process. The glasses were doped by Dy<inf>2</inf>O<inf>3</inf> with six concentrations which varied from 0.00 to 1.50 mol%. The cut and polished glass samples were measured density and refractive index at room temperature. The absorption spectra show at the wavelength 802, 891, 1083, 1265 and 1679 nm that that are matched with the transition of Dy<sup>3+</sup> from <sup>6</sup>H<inf>15/2</inf> (ground state) to various excited state <sup>6</sup>F<inf>5/2</inf>, <sup>6</sup>F<inf>7/2</inf>, <sup>6</sup>F<inf>9/2</inf>, <sup>6</sup>F<inf>11/2</inf> and <sup>6</sup>H<inf>11/2</inf> respectively. The 387 nm flash lamp was used to excite the sample lead to display the five emission bands at 481, 576, 661 and 753 nm which matched with the emission transitions <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>J</inf> (J = 15/2, 13/2, 11/2 and 9/2) respectively. The prominent blue light from <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>15/2</inf> and yellow light from <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>13/2</inf> emissions was combined and produces white light emission, which is confirmed by the CIE chromaticity diagram. The certain Lifetime of important laser-level is <sup>4</sup>F<inf>3/2</inf>, which shows a decreasing trend with the increase of Dy<inf>2</inf>O<inf>3</inf> concentration. The Judd-Ofelt (J-O) intensity parameters found the trend Ω<inf>2</inf> > Ω<inf>4</inf> > Ω<inf>6</inf>. The branching ratios (β<inf>R</inf>) transition probabilities (A<inf>R</inf>) and stimulated emission cross-sections (σ<inf>e</inf>) were estimated for <sup>4</sup>F<inf>9/2</inf>→<sup>6</sup>H<inf>13/2</inf> transition they are the radiative properties that were used to figure out the potential benefit of these glasses for laser action in the visible region along these lines suggests that the present Dy<sup>3+</sup> doped bismuth barium gadolinium borate glasses are suitable for white light applications and scintillator material.