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Subject: search.filters.subject.Judd-Ofelt

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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.
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    White Light Emission and Judd-Ofelt Analysis of Dy3+ Doped Mixed Alkali Borate Glass for W-LEDs Material
    (2023-01-01)
    Jarucha, Nawarut
    ;
    Ruangtaweep, Yotsakit
    ;
    Nawarat, Poomirat
    ;
    Kanthang, Paisan
    ;
    Limsuwan, Pichet
    The Dy<sup>3+</sup> doped lithium sodium potassium borate glasses with white light-emitting were prepared by the melt quenching technique. In this work, optical, photoluminescence properties and Judd-Ofelt analysis of borate glasses have been investigated. For optical properties, Dy<sup>3+</sup> doped glasses showed the absorption in visible and near-infrared region, which originate from <sup>6</sup>H<inf>15/2</inf> ground state to higher state. While the luminescence properties of Dy<sup>3+</sup> doped glasses, the emission spectra were presented more intense at 484 nm (blue light) and 574 nm (yellow light) which are essential for white light emitting materials, whilst decay time decrease with an increase of Dy<inf>2</inf>O<inf>3</inf> contents. The emission intensity of Dy<sup>3+</sup> doped glasses were enhanced by adding Dy<inf>2</inf>O<inf>3</inf> concentrations until 0.5 mol%, after that the emission intensities were decreased due to the concentration quenching effect. Judd-Ofelt is analyzed by using the absorption and photoluminescence results, The stimulated emission cross-section has been investigated in this work. The CIE 1931 chromaticity investigation shows that Dy<sup>3+</sup> doped glass emitted light with white color. Hence, these glasses may be suitable candidates for use in W-LEDs material.