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<p>In this study, calcium yttrium tungstate (Ca<sub>3</sub>Y<sub>2</sub>WO<sub>9</sub>) (CaYW) phosphors doped with Er<sup>3+</sup> ions were synthesised using the conventional solid-state reaction technique. An un-doped host matrix of CaYW was synthesised at three different temperatures—1100°C, 1200°C, and 1250°C—while varying the sintering duration between 10 h and 12 h. The prepared samples were further studied using X-ray diffraction (XRD), revealing that diffraction peaks of the sample sintered at 1100°C closely matched the standard JCPDS pattern (card number 00-038-0218). Furthermore, the material was identified as having a tetragonal crystal structure. Based on these findings, 1100°C was determined to be the optimal sintering temperature, with an ideal sintering time of 10 h and 40 min. Following this, a series of CaYW:<i>x</i>Er<sup>3+</sup> phosphors were synthesised with varying Er<sup>3+</sup> doping concentrations of 1&#xa0;mol%, 3&#xa0;mol%, 5&#xa0;mol%, 7&#xa0;mol%, and 9&#xa0;mol%. Their photoluminescence (PL) properties were examined along with the correlated colour temperature (CCT) and colour purity (CP), revealing strong luminescence in the green spectrum of the visible light region, with a peak centred at 563&#xa0;nm when excited at 380&#xa0;nm. However, concentration quenching was noted when the Er<sup>3+</sup> doping level exceeded 7&#xa0;mol%. Consequently, 7&#xa0;mol% was identified as the optimal doping concentration, and this sample was selected for further characterisation techniques such as XRD, scanning electron microscopy (SEM), ultraviolet (UV) spectroscopy along with diffuse reflectance spectra (DRS), Fourier transform infrared (FT-IR) spectroscopy, and thermogravimetric analysis (TGA) along with differential thermal analysis (DTA). Overall, the key insights of this research suggest that Er<sup>3+</sup>-doped CaYW phosphors demonstrate promising potential for usage in white light-emitting diode (w-LED) applications.</p> Graphical Abstract <p></p>

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Structural and Spectroscopic Insights of Solid-State-Synthesised Er3+-Doped CaYW Phosphor for Next-Generation Optoelectronic Applications

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Bhawna,
  • Swatija Sahoo,
  • Anu,
  • Renuka Bokolia,
  • Shailesh Narain Sharma,
  • A. S. Rao

摘要

In this study, calcium yttrium tungstate (Ca3Y2WO9) (CaYW) phosphors doped with Er3+ ions were synthesised using the conventional solid-state reaction technique. An un-doped host matrix of CaYW was synthesised at three different temperatures—1100°C, 1200°C, and 1250°C—while varying the sintering duration between 10 h and 12 h. The prepared samples were further studied using X-ray diffraction (XRD), revealing that diffraction peaks of the sample sintered at 1100°C closely matched the standard JCPDS pattern (card number 00-038-0218). Furthermore, the material was identified as having a tetragonal crystal structure. Based on these findings, 1100°C was determined to be the optimal sintering temperature, with an ideal sintering time of 10 h and 40 min. Following this, a series of CaYW:xEr3+ phosphors were synthesised with varying Er3+ doping concentrations of 1 mol%, 3 mol%, 5 mol%, 7 mol%, and 9 mol%. Their photoluminescence (PL) properties were examined along with the correlated colour temperature (CCT) and colour purity (CP), revealing strong luminescence in the green spectrum of the visible light region, with a peak centred at 563 nm when excited at 380 nm. However, concentration quenching was noted when the Er3+ doping level exceeded 7 mol%. Consequently, 7 mol% was identified as the optimal doping concentration, and this sample was selected for further characterisation techniques such as XRD, scanning electron microscopy (SEM), ultraviolet (UV) spectroscopy along with diffuse reflectance spectra (DRS), Fourier transform infrared (FT-IR) spectroscopy, and thermogravimetric analysis (TGA) along with differential thermal analysis (DTA). Overall, the key insights of this research suggest that Er3+-doped CaYW phosphors demonstrate promising potential for usage in white light-emitting diode (w-LED) applications.

Graphical Abstract