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<p>Sodium-phosphate (NPZC) glasses by co-doping of Eu<sup>3+</sup> with different Bi<sup>3+</sup> amounts were fabricated via the melt-quenching method. Physical properties like refractive indices, molar volumes, and densities of current co-doped glasses were obtained. No sharp crystalline peaks via XRD (X-ray diffraction) were observed, indicating the amorphous features of the prepared glasses. The FTIR (Fourier transform infrared) spectra of glasses were recorded in the infrared (400–4000&#xa0;cm<sup>−1</sup>) and visible (200–600&#xa0;nm) regions. The cut-off edges (293- 312&#xa0;nm) and band gap energies (4.23–3.97&#xa0;eV) of glasses were estimated from the FTIR. Upon 327&#xa0;nm excitation, co-doped glasses exhibit bluish-green (350–550&#xa0;nm) of Bi<sup>3+</sup>(<sup>3</sup>P<sub>1</sub> → <sup>1</sup>S<sub>0</sub>) and red 612&#xa0;nm of Eu<sup>3+</sup> (<sup>5</sup>D<sub>0</sub> → <sup>7</sup>F<sub>2</sub>). JO (Ω<sub>2</sub> /Ω<sub>4</sub>) parameters and R/O ratios of current glasses are studied. The double-exponential formula is accorded to the decay curves of current glasses, and the decrease in lifetime (472˗378&#xa0;ns) indicates the Bi<sup>3+</sup> to Eu<sup>3+</sup> energy transfer (ET). The maximum ET efficiency of co-doped glasses was found to be 45%. The dipole–dipole interaction causes for PL decay, which is proved by Dexter and Reisfeld’s ET formula. The higher emission cross-section&#xa0;(19.15 × 10<sup>–22</sup> cm<sup>2</sup>) and optical gain (7.45 × 10<sup>–28</sup> cm<sup>2</sup>s) values of glasses were obtained. Moreover, the reddish-orange emission of co-doped glasses demonstrates a CCT value below 2500&#xa0;K and a CP value above 75%.</p>

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Impact of Bi3+ amounts on the structural, emission, and photometric properties of Eu3+-doped NPZC glasses for reddish-orange light applications

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Houssine Bourguiba,
  • Ramachari Doddoji,
  • Marwa Ennouri,
  • Ifa Jlassi,
  • Bernard Gelloz

摘要

Sodium-phosphate (NPZC) glasses by co-doping of Eu3+ with different Bi3+ amounts were fabricated via the melt-quenching method. Physical properties like refractive indices, molar volumes, and densities of current co-doped glasses were obtained. No sharp crystalline peaks via XRD (X-ray diffraction) were observed, indicating the amorphous features of the prepared glasses. The FTIR (Fourier transform infrared) spectra of glasses were recorded in the infrared (400–4000 cm−1) and visible (200–600 nm) regions. The cut-off edges (293- 312 nm) and band gap energies (4.23–3.97 eV) of glasses were estimated from the FTIR. Upon 327 nm excitation, co-doped glasses exhibit bluish-green (350–550 nm) of Bi3+(3P1 → 1S0) and red 612 nm of Eu3+ (5D0 → 7F2). JO (Ω2 /Ω4) parameters and R/O ratios of current glasses are studied. The double-exponential formula is accorded to the decay curves of current glasses, and the decrease in lifetime (472˗378 ns) indicates the Bi3+ to Eu3+ energy transfer (ET). The maximum ET efficiency of co-doped glasses was found to be 45%. The dipole–dipole interaction causes for PL decay, which is proved by Dexter and Reisfeld’s ET formula. The higher emission cross-section (19.15 × 10–22 cm2) and optical gain (7.45 × 10–28 cm2s) values of glasses were obtained. Moreover, the reddish-orange emission of co-doped glasses demonstrates a CCT value below 2500 K and a CP value above 75%.