Synthesis and luminescence properties of Ca₂SiO₄-based red phosphors with Sm³⁺ doping for white LEDs

Jin-jun Cai, Huan-huan Pan, and Yi Wang School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, China

摘 要：Sm3+-activated Ca2SiO4 red phosphors were prepared by the conventional high-temperature solid-state reaction method, and the effects of sodium （Na+） and samarium （Sm3+） ions doping concentrations on their crystal structure and luminescent properties were investigated by X-ray diffraction （XRD） and fluorescent spectrofluorometer.XRD patterns demonstrate that a well-crystalline structure forms in the phosphors when they are treated by calcination at 1200°C for 4h, and the excitation spectra exhibit good absorption in the range between 350 and 420nm. Under the irradiation of 405nm near-ultraviolet （NUV） light, the spectra of the phosphors show a main emission peak at 601nm attributed to the 4G5/2 → 6H7/2 transition of Sm3+ions, and its intensity is greatly influenced by the concentrations of Sm3+ and Na2CO3 . When the concentrations of Sm3+ ions and Na2CO3 are 2mol% and 6mol%, respectively, the optimal emission intensity can be obtained. From strong absorption in the near ultraviolet zone, the Na0.06 Sm0.02Ca1.92SiO4 phosphor is a promising red-emitting phosphor for white light emitting diodes （W-LEDs）.

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