Microstructure and photoluminescent properties of Sr{sub 2}SiO{sub 4}:Eu{sup 3+} phosphors with various NH{sub 4}Cl flux concentrations
- Institute of Microelectronics, Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan (China)
- Department of Material Engineering, National Pingtung University of Science and Technology, Pingtung County 912, Taiwan (China)
Graphical abstract: This paper describes effects of NH{sub 4}Cl concentration on microstructural and luminescent characteristics of Sr{sub 2}SiO{sub 4}:Eu{sup 3+} phosphors using microwave assisted sintering at 1200 °C for 1 h. The results showed the improved photoluminescence properties of microwave sintered Sr{sub 2}SiO{sub 4}:Eu{sup 3+} phosphors by adding NH{sub 4}Cl flux. Highlights: ► NH{sub 4}Cl flux improved the luminescence properties of microwave sintered phosphors. ► The particle sizes were enlarged from 1 μm to 10 μm as the NH{sub 4}Cl flux was added. ► The maximum photoluminescence intensity was appeared as adding 1 wt% NH{sub 4}Cl flux. ► The decay times of Sr{sub 2}SiO{sub 4}:Eu{sup 3+} phosphors with NH{sub 4}Cl flux were around 2.47–2.52 ms. -- Abstract: In this paper, effect of NH{sub 4}Cl flux concentrations (0, 1, 2, 3 and 4 wt%) on the crystal structure, morphology and photoluminescent properties of Sr{sub 2}SiO{sub 4}:Eu{sup 3+} phosphors synthesized by a microwave sintering at 1200 °C for 1 h was investigated and discussed. X-ray powder diffraction analysis showed the crystal structure was not affected and the pure Sr{sub 2}SiO{sub 4} phase was formed without second phase or phases of starting materials when adding with the NH{sub 4}Cl flux. The SEM images indicated that increase of the NH{sub 4}Cl flux enlarged the particle size of the phosphor particles. The photo-luminescence results showed the addition of 1 wt% NH{sub 4}Cl flux much improved the emission intensity at λ{sub em} of 617 nm as the excitation spectrum at λ{sub ex} of 395 nm. The decay times of Sr{sub 2}SiO{sub 4}:Eu{sup 3+} phosphors with different NH{sub 4}Cl flux concentrations were obtained around 2.47–2.52 ms.
- OSTI ID:
- 22215106
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 6; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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