Synthesis and Luminescence Properties of Green-emitting Phosphor CaSc₂O₄:Ce³⁺

Abstract

Using CaCO₃, Sc₂O₃, and CeO₂ as raw materials, we prepared the CaSc₂O₄:Ce³⁺ green phosphors for white light LEDs via a high-temperature solid-phase method in a reducing atmosphere. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), fluorescence spectroscopy and other means were used to characterize the phase structure, apparent morphology, and photoluminescence properties of the product. CaSc₂O₄ was synthesized under a reducing atmosphere (95% N₂+5% H₂) at 1 400 °C for 4 hours. Upon excitation with a blue light (450 nm wavelength), CaSc₂O₄:Ce³⁺ displays a broadband green emission peak at 525 nm. The color coordinates of CaSc₂O₄:7% Ce³⁺ emission peak are (0.3712, 0.5940), and the product morphology is 1 μm granular. Hence, it acts as a green phosphor suitable for white LEDs that can be excited by blue light.

Keywords

WLED / CaSc₂O₄:Ce³⁺ / phosphor / luminescence properties

References

[1] Guo J, Zhao L, Tang Q, et al. Spectral Study on Energy Transfer of the LiMgPO₄ Phosphor Doped with Tm³⁺ and Tb³⁺[J]. Journal of Luminescence, 2020, 228(3): 117613

[2] Liu YY, Liu H, Zhao XX, et al. Effect of Spherical Particle Size on the Electrochemical Properties of Lithium Iron Phosphate[J]. Journal of Wuhan University of Technology -Materials Science Edition, 2019, 34(3): 47-55.

[3] Li Z, Wang YF, Cao J, et al. Hydrothermal Synthesis and Luminescent Properties of BaMoO₄:Sm³⁺ Red Phosphor[J]. Journal of Rare Earth, 2016, 34(2): 143-147.

[4] Sun ZG, Lu B, Ren GP, et al. Synthesis of Green-Emitting Gd₂O₂S:Pr³⁺ Phosphor Nanoparticles and Fabrication of Translucent Gd₂O₂S:Pr³⁺ Scintillation Ceramics[J]. Nanomaterials, 2020, 10(9): 1639-1642.

[5] Li Z, Zhao XC, Jiang YR. Hydrothermal Preparation and Photoluminescent Property of LiY(MoO₄)₂:Pr³⁺ Red Phosphors for White Light-emitting Diodes[J]. Journal of Rare Earth, 2015, 33(1): 33-36.

[6] Erdomu E, Yildiz E. Structural and Luminescence Properties of Pb²⁺-doped Li₆Gd(BO₃)₃ Phosphor[J]. Journal of Applied Spectroscopy, 2020, 87(4): 615-620.

[7] Ming ZQ, Zhao J, Swart HC, et al. Luminescence and Energy Transfer of Color-tunable Lu₂MgAl₄SiO₁₂: Eu²⁺, Ce³⁺, Mn²⁺ Phosphors[J]. Journal of Rare Earth, 2020, 38(5): 64-71.

[8] Mi WX, Zheng J, Qiao P, et al. Tunable Luminescence, Energy Transfer and Excellent Thermal Stability of SrMg₂(PO₄)₂:Ce³⁺,Tb³⁺ Phosphors for LEDs[J]. Journal of Rare Earth, 2021, 39(1): 25-31.

[9] Xiong XB, Yuan XM, Liang YJ, et al. Photoluminescence Properties and Energy Transfer from Ce³⁺ to Tb³⁺ in Zn₂SiO₄ Host[J]. Journal of Wuhan University of Technology -Materials Science Edition, 2015, 30(2): 235-240.

[10] Li Z, Wang YF, Cao J. Controlled Synthesis and Application of α-Al₂O₃ for Lu₃Al₅O₁₂:Ce³⁺ Green Spherical Phosphors[J]. Journal of Wuhan University of Technology -Materials Science Edition, 2018, 33(5): 1028-1031.

[11] Fan B, Liu J, Qi SM, et al. Preparation and Luminescent Properties of Green Phosphors LaGaO₃:Tb³⁺,Sn⁴⁺[J]. Spectroscopy and Spectral Analysis, 2020, 40(1): 65-70.

[12] Chatterjee R, Saha S, Panigrahi K, et al. Blue Emitting BaAl2O4:Ce³⁺ Nanophosphors with High Color Purity and Brightness for White LEDs[J]. Microscopy and Microanalysis, 2019, 25(6): 1466-1470.

[13] Li XS, Guo CJ, Wang HW, et al. Green emitting Ba_1.5Lu_1.5Al_3.5Si_1.5O₁₂:Ce³⁺ Phosphor with High Thermal Emission Stability for Warm WLEDs and FEDs-Science Direct[J]. Ceramics International, 2020, 46(5): 5863-5870.

[14] Wang HH, Wu M, Ma BL, et al. Molten-salt Synthesis of Large Micron-sized YAG:Ce³⁺ Phosphors for Laser Diode Applications[J]. Ceramics International, 2019, 45(17): 21657-21660.

[15] Zhao QS, Lu LP, Zhang XY, et al. Preparation and Characterization of YAG:Ce³⁺ Phosphors by Molten Salt Synthesis Method[J]. Mater Research Express, 2019, 6(8): 086321