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    THE DEVELOPMENT OF SM3+ DOPED BARIUM TITANIUM BISMUTH BORATE GLASS FOR ORANGE EMISSION MATERIAL APPLICATION
    (2025-01-01)
    Jarucha, Nawarut
    ;
    Ruangtaweep, Yotsakit
    ;
    Meejitpaisan, Piyachat
    ;
    Limsuwan, Pichet
    ;
    Kim, Hong Joo
    SM<sup>3+</sup>–doped borate glasses were synthesized using the melt–quenching method, and luminescence characteristics were systematically investigated. Initially, the glass composition was modified by varying the Bi<inf>2</inf>O<inf>3</inf> content while maintaining the SM<sup>3+</sup> concentration at 1.00 mol%. Optical absorption measurements revealed that BiBaTB1Sm glasses exhibited a prominent peak at 401 nm in the visible region, which was selected as the excitation wavelength for photoluminescence analysis. The emission spectra demonstrated a maximum intensity at 598 nm under 401 nm excitation. Notably, the glass sample without Bi<inf>2</inf>O<inf>3</inf> showed stronger emission compared to the Bi<inf>2</inf>O<inf>3</inf>-doped counterparts. In a separate study, the SM<sup>3+</sup> concentration was varied (0.0, 0.1, 0.5, 1.0, and 2.0 mol%) to examine its effect on luminescence properties. luminescence intensity enhanced as the Sm content increased to 0.5 mol% before decreasing at higher concentrations due to the concentration quenching effect. Additionally, fluorescence decay time measurements indicated a reduction in lifetime with increasing SM<sup>3+</sup> content, attributed to energy transfer via cross-relaxation mechanisms. The CIE diagram confirmed that Sm<inf>2</inf>O<inf>3</inf>-doped glass emitted orange light. These findings suggest that SM<sup>3+</sup>-doped borate glasses hold promise for applications in orange-emitting photonic devices.
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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.