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Red-light-emitting phosphors based on Sr1.5Ca0.5SiO4 activated by trivalent europium ions (Eu3+) were successfully synthesized using a solid-state reaction method, and their luminescence properties were investigated. The photoluminescence spectra of Sr1.5Ca0.5SiO4:x Eu3+ phosphors synthesized at different temperatures and times and with different Eu3+ concentrations revealed emission peaks at 591 nm, 612 nm and 655 nm, which can probably be attributed to the transition of Eu3+ ions from 5D0 to 7FJ (J = 1, 2 and 3). The emission intensities of the transitions from 5D0 to 7FJ (J = 1, 2 and 3) increased as the synthesizing temperature rose for 2 h. Comparison with the relevant International Commission on Illumination diagram showed that Sr1.5Ca0.5SiO4:x Eu3+ phosphors synthesized at different temperatures and times and with different Eu3+ concentrations all emitted red light, with phosphors synthesized at 1300 ℃ and with concentrations of 1.5 at.% yielding the maximum emission intensity. These results show Sr1.5Ca0.5SiO4:1.5% Eu3+ to be a noteworthy red-light-emitting phosphor candidate for white light-emitting diodes (WLEDs).
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