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<p>Pr³⁺-doped Tellurium–Bismuth–Borate (TEBIB) glasses were synthesized using the conventional melt-quenching method to investigate their structural, optical, and chromaticity characteristics. X-ray diffraction (XRD) confirmed the amorphous nature of all samples, and FTIR spectra revealed the presence of TeO₄, BO₃, and BiO₆ structural groups, demonstrating that Pr³⁺ ions were homogeneously incorporated into the glass network without inducing crystallization. The optical absorption spectra exhibited well-resolved 4f–4f transitions characteristic of Pr³⁺ ions. Judd–Ofelt (J–O) analysis of the parameter sequence Ω₂ &gt; Ω₆ &gt; Ω₄, indicating a highly asymmetric and covalent ligand environment favorable for strong electric-dipole transitions. Photoluminescence studies revealed several visible emissions, among which a dominant blue emission band at ~ 480&#xa0;nm was attributed to the ³P₀ → ³H₄ transition. The CIE 1931 chromaticity analysis yielded coordinates (x = 0.14, y = 0.09), confirming the prominence of blue emission with color purity exceeding 80%. Minor coordinate shifts toward the green region with increasing Pr³⁺ concentration were associated with cross-relaxation effects. The combined structural, optical, and chromaticity investigations affirm that Pr³⁺-doped TEBIB glasses possess excellent transparency, thermal stability, and efficient blue luminescence, making them promising materials for visible-range photonic devices, solid-state lasers, and optical display technologies.</p>

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Physical, optical and chromaticity investigations of Pr³⁺ doped Tellurium–Bismuth–Borate glasses for blue emission applications

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Pawan Kumar,
  • S. S. Meena,
  • Menka Meena,
  • Nitiksha sharma,
  • Beena Bhatia

摘要

Pr³⁺-doped Tellurium–Bismuth–Borate (TEBIB) glasses were synthesized using the conventional melt-quenching method to investigate their structural, optical, and chromaticity characteristics. X-ray diffraction (XRD) confirmed the amorphous nature of all samples, and FTIR spectra revealed the presence of TeO₄, BO₃, and BiO₆ structural groups, demonstrating that Pr³⁺ ions were homogeneously incorporated into the glass network without inducing crystallization. The optical absorption spectra exhibited well-resolved 4f–4f transitions characteristic of Pr³⁺ ions. Judd–Ofelt (J–O) analysis of the parameter sequence Ω₂ > Ω₆ > Ω₄, indicating a highly asymmetric and covalent ligand environment favorable for strong electric-dipole transitions. Photoluminescence studies revealed several visible emissions, among which a dominant blue emission band at ~ 480 nm was attributed to the ³P₀ → ³H₄ transition. The CIE 1931 chromaticity analysis yielded coordinates (x = 0.14, y = 0.09), confirming the prominence of blue emission with color purity exceeding 80%. Minor coordinate shifts toward the green region with increasing Pr³⁺ concentration were associated with cross-relaxation effects. The combined structural, optical, and chromaticity investigations affirm that Pr³⁺-doped TEBIB glasses possess excellent transparency, thermal stability, and efficient blue luminescence, making them promising materials for visible-range photonic devices, solid-state lasers, and optical display technologies.