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<p>Two phosphors converted white light emitting diodes (WLEDs) were fabricated by coating a blend of red and green-emitting phosphors on a blue InGaN LED chip (CREE 460&#xa0;nm). The required red and green-emitting phosphor samples were prepared by the modified wet chemical synthesis method. The synthesis method adopted here is Eco-friendly, Economical and Easy to handle. The powder XRD pattern and Rietveld refinement confirmed the crystal structures of phosphor samples. Photoluminescence (PL) emission and photoluminescence excitation spectra (PLE), and concentration quenching were noted for these phosphor samples. The red and green emitting phosphor samples showing optimal intensity were selected for WLED fabrication. SEM images were recorded to analyze particle size, and color coordinates were measured to assess color purity. Three types of WLED sources were fabricated by coating these two phosphors (red and green emitting) in different proportions on blue LED chips. The Commission Internationale de l’Éclairage (CIE) color coordinates, color rendering index (CRI), correlated color temperature (CCT), S/P ratio, Standard deviation of color matching (SDCM), and the hue bin comparison of R1-R16 values were noted for these WLEDs. Our fabricated LED, featuring this phosphor combination, achieves a record Ra value of 92.6 while also significantly enhancing other parameters.</p>

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Synthesis, characterization and fabrication of dual-phosphor converted white LED sources with improved parameters

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • D. P. Awade,
  • Priya V. Tumram,
  • Vaishali Raikwar,
  • S. K. Omanwar,
  • S. V. Moharil

摘要

Two phosphors converted white light emitting diodes (WLEDs) were fabricated by coating a blend of red and green-emitting phosphors on a blue InGaN LED chip (CREE 460 nm). The required red and green-emitting phosphor samples were prepared by the modified wet chemical synthesis method. The synthesis method adopted here is Eco-friendly, Economical and Easy to handle. The powder XRD pattern and Rietveld refinement confirmed the crystal structures of phosphor samples. Photoluminescence (PL) emission and photoluminescence excitation spectra (PLE), and concentration quenching were noted for these phosphor samples. The red and green emitting phosphor samples showing optimal intensity were selected for WLED fabrication. SEM images were recorded to analyze particle size, and color coordinates were measured to assess color purity. Three types of WLED sources were fabricated by coating these two phosphors (red and green emitting) in different proportions on blue LED chips. The Commission Internationale de l’Éclairage (CIE) color coordinates, color rendering index (CRI), correlated color temperature (CCT), S/P ratio, Standard deviation of color matching (SDCM), and the hue bin comparison of R1-R16 values were noted for these WLEDs. Our fabricated LED, featuring this phosphor combination, achieves a record Ra value of 92.6 while also significantly enhancing other parameters.