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<p>A series of phosphors based on a pellyite-type BCZSO (Ba<sub>2</sub>CaZn<sub>2</sub>Si<sub>6</sub>O<sub>17</sub>) silicate host were synthesized via the conventional solid-state reaction method by co-doping with various combinations of metal ions (Pb²⁺, Bi³⁺) and rare-earth ions (Bi³⁺, Eu³⁺; Bi³⁺, Tb³⁺; Bi³⁺, Tb³⁺, Eu³⁺; and Pb²⁺, Eu³⁺) at different concentrations. The structural and morphological characteristics of the prepared samples were examined using powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). Their photoluminescence (PL) properties were systematically investigated. The efficiency of energy transfer between sensitizer and activator ions was analyzed in the co-doped systems. Luminescence decay profiles revealed that the lifetimes of the doped ions fall within the microsecond (Pb²⁺, Eu³⁺) and millisecond (Bi³⁺, Eu³⁺; Bi³⁺, Tb³⁺, Eu³⁺) ranges. The chromatic properties of the phosphors were evaluated using CIE chromaticity coordinates, and the correlated color temperature (CCT) values indicated that Bi³⁺, Eu³⁺ co-doped samples emit in the cold white region, while Bi³⁺, Tb³⁺; Bi³⁺, Tb³⁺, Eu³⁺; and Pb²⁺, Eu³⁺ doped samples emit in the warm white region. Given their promising thermal stability and efficient near-white light emission, the BCZSO-based phosphors demonstrate potential as suitable candidates for use in phosphor-converted white light-emitting diodes (pc-WLEDs).</p>

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Comparative Studies of the Photoluminescence Properties of the Metal Ions Co-doped with the Rare Earth Ions (Bi3+, Eu3+; Bi3+, Tb3+; Bi3+, Tb3+, Eu3+ and Pb2+, Eu3+) in the Silicate Based Single Phosphors for White Light Emitting Diode Applications

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • P. Sugumar,
  • P. Balakrishnan

摘要

A series of phosphors based on a pellyite-type BCZSO (Ba2CaZn2Si6O17) silicate host were synthesized via the conventional solid-state reaction method by co-doping with various combinations of metal ions (Pb²⁺, Bi³⁺) and rare-earth ions (Bi³⁺, Eu³⁺; Bi³⁺, Tb³⁺; Bi³⁺, Tb³⁺, Eu³⁺; and Pb²⁺, Eu³⁺) at different concentrations. The structural and morphological characteristics of the prepared samples were examined using powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). Their photoluminescence (PL) properties were systematically investigated. The efficiency of energy transfer between sensitizer and activator ions was analyzed in the co-doped systems. Luminescence decay profiles revealed that the lifetimes of the doped ions fall within the microsecond (Pb²⁺, Eu³⁺) and millisecond (Bi³⁺, Eu³⁺; Bi³⁺, Tb³⁺, Eu³⁺) ranges. The chromatic properties of the phosphors were evaluated using CIE chromaticity coordinates, and the correlated color temperature (CCT) values indicated that Bi³⁺, Eu³⁺ co-doped samples emit in the cold white region, while Bi³⁺, Tb³⁺; Bi³⁺, Tb³⁺, Eu³⁺; and Pb²⁺, Eu³⁺ doped samples emit in the warm white region. Given their promising thermal stability and efficient near-white light emission, the BCZSO-based phosphors demonstrate potential as suitable candidates for use in phosphor-converted white light-emitting diodes (pc-WLEDs).