Synthesis and photoluminescence properties of NaLaMgWO₆:RE³⁺ (RE = Eu, Sm, Tb) phosphor for white LED application

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• 作者：Jingshan Hou^a ; ^b ; ^c ; Xin Yin^b ; ^c ; Fuqiang Huang^b ; ^c ; ^{huangfq@mail.sic.ac.cn} ; Weizhong Jiang^a ; ^{jwzh@dhu.edu.cn}
• 关键词：A. Optical materials ; B. Chemical synthesis ; C. X-ray diffraction ; C. Electron microscopy ; D. Luminescence ; D. Crystal structure
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：June, 2012
• 卷：47
• 期：6
• 页码：1295-1300
• 文件大小：1217 K

摘要

Single phase of NaLa_1鈭?em>xMgWO₆:xRE³⁺ (0 < x 鈮?) (RE = Eu, Sm, Tb) phosphors were prepared by solid-state reaction method. X-ray diffraction, scanning electron microscopy, the morphology energy-dispersive X-ray spectroscopy, UV-vis diffuse reflectance spectra and photoluminescence were used to characterize the samples. Under the light excitation, NaLaMgWO₆:Eu³⁺, NaLaMgWO₆:Sm³⁺ and NaLaMgWO₆:Tb³⁺, phosphors showed the characteristic emissions of Eu³⁺ (⁵D₀ 鈫?#xA0;⁷F_{4, 3, 2, 1}), Sm³⁺ (⁴G_5/2 鈫?#xA0;⁶H_{5/2, 7/2, 9/2}), and Tb³⁺ (⁵D₄ 鈫?#xA0;⁷F_{6, 5, 4, 3}), respectively. The intensity of the red emission for Na(La_0.6Eu_0.4)MgWO₆ is 2.5 times higher than that of (Y_0.95Eu_0.05)₂O₃ under blue light irradiation. The quantum efficiencies of the entitled phosphors excited under 394 nm and 464 nm are also investigated and compared with commercial phosphors Y₂O₃:Eu³⁺, Sr₂Si₅N₈:Eu²⁺ and Y₃A₅G₁₂:Ce³⁺. The results demonstrated NaLaMgWO₆:RE³⁺ phosphors as potential candidates for white light emitting diode pumped by UV or blue chip.