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- W2039348429 abstract "(2012년 3월 22일 접수 : 2012년 4월 17일 최종수정 : 2012년 4 월 17일 채택) Abstract Red phosphors Ca1-1.5xWO4:Eux 3+ were synthesized with different concentrations of Eu 3+ ions by using a solid-state reaction method. The crystal structure of the red phosphors was found to be a tetragonal system. X-ray diffraction (XRD) results showed the (112) main diffraction peak centered at 2θ = 28.71 o , and the size of crystalline particles exhibited an overall decreasing tendency according to the concentration of Eu 3+ ions. The excitation spectra of all the phosphors were composed of a broad band centered at 275 nm in the range of 230-310 nm due to O 2� → W 6+ and a narrow band having a peak at 307 nm caused by O 2� → Eu 3+ . Also, the excitation spectrum presents several strong lines in the range of 305-420 nm, which are assigned to the 4f-4f transitions of the Eu 3+ ion. In the case of the emission spectrum, all the phosphor powders, irrespective of Eu 3+ ion concentration, indicated an orange emission peak at 594 nm and a strong red emission spectrum centered at 615 nm, with two weak lines at 648 and 700 nm. The highest red emission intensity occurred at x = 0.10 mol of Eu 3+ ion concentration with an asymmetry ratio of 12.5. Especially, the presence of Eu 3+ in the Ca1-1.5xWO4:Eux 3+ shows very effective use of excitation energy in the range of 305-420 nm, and finally yields a strong emission of red light." @default.
- W2039348429 created "2016-06-24" @default.
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- W2039348429 date "2012-05-01" @default.
- W2039348429 modified "2023-09-26" @default.
- W2039348429 title "Synthesis and Photoluminescence Properties of CaWO4:Eu3+ Phosphors" @default.
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- W2039348429 doi "https://doi.org/10.3740/mrsk.2012.22.5.215" @default.
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