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<p>In this study, the optical properties of Dy<sup>3</sup>⁺-doped SrZrSi₂O₇ (SZSO) luminescent materials were synthesized via a high-temperature solid-state reaction method and investigated for the first time. The crystal structure and phase purity of the synthesized phosphors were examined using the X-ray diffraction (XRD) technique. The XRD results matched the standard JCPDS suggesting that the prepared samples comprise a monoclinic phase structure. The structure of the synthesized phosphor was validated using the Rietveld refinement technique. Vibrational modes, surface morphology, and chemical composition were examined using Fourier Transform Infrared (FTIR) spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), and Energy Dispersive X-ray (EDX) spectroscopy, respectively. Under 354&#xa0;nm excitation, the phosphors exhibit three emission peaks at 492, 580, and 723&#xa0;nm, corresponding to the transitions <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>15/2</sub>, <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>13/2</sub>, and<sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>11/2</sub>. The PL intensity of the samples increased with rising Dy<sup>3</sup>⁺ ion concentration until concentration quenching occurred at x = 1.0&#xa0;mol% and the critical distance (Rc) was calculated to be 24&#xa0;Å. By doping Dy<sup>3</sup>⁺ ions into the phosphors capable of emitting white light were synthesized, exhibiting CIE chromaticity coordinates of (0.2883, 0.3123) which are in close agreement with the standard white light coordinates of (0.333, 0.333). The CCT analysis revealed that the emitted light from these phosphors is cool in nature. The diffuse reflectance spectroscopy (DRS) analysis was conducted to calculate the band gap of the prepared phosphor, which was found to be 5.04&#xa0;eV. The thermoluminescence (TL) properties of SZSO: Dy<sup>3</sup>⁺ phosphors were also studied, and relevant trapping parameters—including the order of kinetics (b), shape factor (μ<sub>g</sub>), trap density (n<sub>₀</sub>), frequency factor (s), and activation energy (E<sub>a</sub>)—are determined using Chen’s peak shape method. The thermoluminescence (TL) of UV-irradiated (254&#xa0;nm) samples was recorded at a constant heating rate of 5&#xa0;°C/s. The sample doped with 2&#xa0;mol% Dy<sup>3</sup>⁺ and irradiated for 50&#xa0;min exhibited optimal thermoluminescence (TL) intensity in the temperature range of 100–150&#xa0;°C, characterized by a single broad TL glow peak extending from 45 to 300&#xa0;°C. Using the TL glow curve deconvolution method, five distinct deconvoluted peaks were identified, indicating the presence of five separate trap centers. All these parameters prove that this material is a potential candidate for applications in thermoluminescent dosimeters (TLDs) and white light-emitting diodes (WLEDs).</p>

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Investigation on Optical Properties of Cool White Light Emitting Dy3+ Doped SrZrSi2O7 Luminescent Materials for WLEDs and TLD Applications

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Sanjay Kumar Baghel,
  • Nameeta Brahme,
  • D. P. Bisen,
  • Ganesh Ram Banjare,
  • Yugbodh Patle,
  • Chitrkant Belodhiya

摘要

In this study, the optical properties of Dy3⁺-doped SrZrSi₂O₇ (SZSO) luminescent materials were synthesized via a high-temperature solid-state reaction method and investigated for the first time. The crystal structure and phase purity of the synthesized phosphors were examined using the X-ray diffraction (XRD) technique. The XRD results matched the standard JCPDS suggesting that the prepared samples comprise a monoclinic phase structure. The structure of the synthesized phosphor was validated using the Rietveld refinement technique. Vibrational modes, surface morphology, and chemical composition were examined using Fourier Transform Infrared (FTIR) spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), and Energy Dispersive X-ray (EDX) spectroscopy, respectively. Under 354 nm excitation, the phosphors exhibit three emission peaks at 492, 580, and 723 nm, corresponding to the transitions 4F9/2 → 6H15/2, 4F9/2 → 6H13/2, and4F9/2 → 6H11/2. The PL intensity of the samples increased with rising Dy3⁺ ion concentration until concentration quenching occurred at x = 1.0 mol% and the critical distance (Rc) was calculated to be 24 Å. By doping Dy3⁺ ions into the phosphors capable of emitting white light were synthesized, exhibiting CIE chromaticity coordinates of (0.2883, 0.3123) which are in close agreement with the standard white light coordinates of (0.333, 0.333). The CCT analysis revealed that the emitted light from these phosphors is cool in nature. The diffuse reflectance spectroscopy (DRS) analysis was conducted to calculate the band gap of the prepared phosphor, which was found to be 5.04 eV. The thermoluminescence (TL) properties of SZSO: Dy3⁺ phosphors were also studied, and relevant trapping parameters—including the order of kinetics (b), shape factor (μg), trap density (n₀), frequency factor (s), and activation energy (Ea)—are determined using Chen’s peak shape method. The thermoluminescence (TL) of UV-irradiated (254 nm) samples was recorded at a constant heating rate of 5 °C/s. The sample doped with 2 mol% Dy3⁺ and irradiated for 50 min exhibited optimal thermoluminescence (TL) intensity in the temperature range of 100–150 °C, characterized by a single broad TL glow peak extending from 45 to 300 °C. Using the TL glow curve deconvolution method, five distinct deconvoluted peaks were identified, indicating the presence of five separate trap centers. All these parameters prove that this material is a potential candidate for applications in thermoluminescent dosimeters (TLDs) and white light-emitting diodes (WLEDs).