Synthesis of high efficient Ca{sub 2}SiO{sub 4}:Eu{sup 2+} green emitting phosphor by a liquid phase precursor method

Journal Article · Tue May 15 04:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2011.11.046· OSTI ID:22012106

Luo, Y Y; Jo, D S; Senthil, K ^[1]; Tezuka, S; Kakihana, M ^[2]; Toda, K ^[3]; Masaki, T ^[1]

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1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577 (Japan)
3. Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, Ikarashi 2 nocho 8050, Niigata 950-2181 (Japan)

Green emitting Eu{sup 2+}-doped Ca{sub 2}SiO{sub 4} phosphors were synthesized by three different methods (a conventional solid state reaction (SSR) method, a novel liquid phase precursor approach using SiO{sub 2} sol (LPP-SiO{sub 2}(sol)) and water-soluble silicon compound (LPP-WSS)). The obtained phosphors exhibited a broad excitation spectrum ranging from 225 to 450 nm and a strong green emission peak at 502 nm due to the 4f{sup 6}5d{sup 1}{yields}4f{sup 7}({sup 8}S{sub 7/2}) transition of Eu{sup 2+}. The highest luminescent intensity was obtained for the samples fired at 1100 Degree-Sign C. The dependence of luminescence properties on Eu{sup 2+} concentration for the phosphors synthesized using LPP-WSS method was also examined from 0.1 to 5.0 mol% and the maximum emission intensity was observed at 3.0 mol% Eu{sup 2+}. A detailed analysis using various characterizations revealed that phosphors produced by the LPP-WSS process exhibited more homogenous phase distribution and higher luminescence intensity than those from the other two processes, which suggested the potential application of Ca{sub 2}SiO{sub 4}:Eu{sup 2+} in white light-emitting diodes and fluorescence lamps. - Graphical abstract: The synthesis of Eu{sup 2+} doped Ca{sub 2}SiO{sub 4} green emitting phosphors were carried out using LPP-SiO{sub 2}(sol), LPP-WSS and SSR methods. The adequate reaction of starting materials base on solution mixing and cellulose impregnating during LPP-WSS procedure resulted in single crystalline structure as well as fine morphology, and finally determined a superior luminescent intensity. Highlights: Black-Right-Pointing-Pointer Ca{sub 2}SiO{sub 4}:Eu{sup 2+} phosphor was synthesized by three methods (SSR, LPP-SiO{sub 2} and LPP-WSS). Black-Right-Pointing-Pointer Effect of different processes on the property of phosphor was studied. Black-Right-Pointing-Pointer Phosphor produced by LPP-WSS showed better homogenous phase and fluorescent property. Black-Right-Pointing-Pointer LPP-WSS approach was identified as the best method among these three approaches.

• OSTI ID: 22012106
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. . 189; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALCIUM SILICATES
CELLULOSE
DISTRIBUTION
DOPED MATERIALS
EUROPIUM IONS
EXCITATION
FLUORESCENCE
LIGHT EMITTING DIODES
LIQUIDS
MONOCRYSTALS
MORPHOLOGY
PEAKS
PHOSPHORS
PRECURSOR
SILICA
SILICON OXIDES
SOLIDS
SOLS
SYNTHESIS
THERMAL ANALYSIS