Synthesis and Energy Transfer Mechanism of La1.9Y0.06Mo2O9∶Eu3+Sm3+ Phosphor by Solvent Thermal Method
HOU Qinqin1, JIANG Yuanru2, GAN Junyang2, ZHAO Yajuan2, ZHAO Bin2, HAN Tong3
1 Xi’an University of Architecture and Technology Huaqing Collage, Xi’an 710043 2 School of Science, Xi’an University of Architecture and Technology, Xi’an 710055 3 Northwest Industrial Group, Xi’an 710043
Abstract: La1.9Y0.06Mo2O9∶Eu3+Sm3+ series phosphor powder was synthesized by solvothermal method with ethylene glycol as solvent. The crystal texture, morphology under different solvent ratios and the energy transfer mechanism of La1.9Y0.06Mo2O9∶Eu3+Sm3+ phosphor powder were researched through XRD, SEM and PL.The XRD results showed that: La1.9Y0.06Mo2O9∶Eu3+Sm3+ phosphor powder was the cubic structure of the space point group P123 with a high degree of crystallinity. The doping of rare earth ion and adding of solvent did not change the crystal structure of phosphor powder. SEM found that the sample was dandelion 3D spherical particle with net structure, thin wall, regular shape, uniform size and good dispersion. Its diameter was around 8 μm. In La1.9Y0.06Mo2O9∶Eu3+Sm3+ phosphor powder, the co-doping of Sm3+ effectively improved the concentration quenching of Eu3+. When the concentration of Eu3+ was 16%, fluorescence intensity reached the maximum value, and the concentration quenching occurred when the concentration was increased to 20%. At 465 mm excitation wavelength, 4f characteristic spectrum of Eu3+ was emitted, and La1.9Y0.06Mo2O9∶16%Eu3+3%Sm3+ was about 7 times intensity of La1.9Y0.06Mo2O9∶8%Eu3+. The fluorescence intensity was effectively enhanced by the doping of Sm3+. Meanwhile, the strong but narrow peak position at 591 nm and 616 nm did not change, electric dipole transition of5D0-7F2 remained the strongest, and typical red light was emitted. And under the 405 nm stimulation, the 4f characteristic spectrum of Eu3+ was still emitted, which illustrated that the energy was effectively transferred to Eu3+, with the transfer efficiency of about 55%. The energy transfer belonged to dipole-dipole interaction (d-d).
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