Study of the effect of doping dysprosium ions in soda lime silicoborate glasses using microwave techniques for white-light-emitting diodes (WLEDs)

Nattaporn Mahingsa; Watcharin  Rachniyom; Keerati  Kirdsiri; Nattapon  Srisittiposakun

doi:10.53848/ssstj.v12i1.1034

Authors

Nattaporn Mahingsa Nakhon Pathom Rajabhat University
Watcharin Rachniyom Nakhon Pathom Rajabhat University
Keerati Kirdsiri Nakhon Pathom Rajabhat University
Nattapon Srisittiposakun Nakhon Pathom Rajabhat University

DOI:

https://doi.org/10.53848/ssstj.v12i1.1034

Keywords:

Dysprosium ions, Soda lime borosilicate glass, Luminescence, White-light application, Microwave techniques.

Abstract

Soda lime silicoborate glasses doped with dysprosium ions (Dy³⁺) were synthesized with a glass composition of 55.0B₂O₃: 25.0SiO₂: 10.0Na₂O: 10.0CaO: xDy₂O₃ (where x represents the concentration of Dy₂O₃, varying from 0.0 to 2.0 mol%). The synthesis was carried out using a microwave technique and the physical, optical and luminescence properties of the obtained glasses were investigated. The results showed that the density and refractive index increased, while the molar volume decreased with higher Dy₂O₃ concentration. The absorption spectra indicated that these glasses exhibited absorption in the UV-visible and near-infrared light regions. When excited at 388 nm, the glass emitted light at wavelengths of 481, 575, and 663 nm. The emission intensity increased with increasing Dy₂O₃ concentration up to 0.5 mol%, after which it decreased due to the concentration quenching effect. The CIE 1931 chromaticity diagram confirmed that the glasses emitted light in the white region. Likewise, the glasses exhibited CCT values that fall within the bright white color region, with temperature values ranging from 4309 to 4393 K. The Y/B ratio was calculaed from the luminscence spectraindicating the level of asymmetry in the prepared glasses. The decay time showed a non-exponential behavior, indicating cross -relaxation between Dy³⁺-Dy³⁺ ions, and the decay curve was fitted using the IH model S = 10 (quadrupole-quadrupole). The Judd-Ofelt (JO) parameters (W₂, W₄ and W₆) were calculated from the absorption spectra, and the radiative transition probabilities (A_R), stimulated emission cross-sections (σ(λ_p)) and branching ratios (β_R) were obtained from the JO parameters. The results confirm the suitability of these glass samples for use in WLEDs and as laser medium.

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