Synthesis and photoluminescence of Ca-(Sn,Ti)-Si-O compounds
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira Aoba-ku, Sendai, Miyagi 980-8577 (Japan)
- NEC Lighting, Ltd., Research and Development Department, 3-1, Nichiden, Minakuchi-cho, Koka-shi, Shiga 528-8501 (Japan)
The phase relation of the compounds prepared in the CaO-SnO{sub 2}-SiO{sub 2} system at 1673 K and in the CaO-TiO{sub 2}-SiO{sub 2} system at 1573 K was investigated in order to explore new Ti{sup 4+}-activated stannate phosphors. Solid solutions of Ca(Sn{sub 1-x}Ti{sub x})SiO{sub 5} and Ca{sub 3}(Sn{sub 1-y}Ti{sub y})Si{sub 2}O{sub 9} were synthesized at x = 0-1.0 and y = 0-0.10, respectively, and their crystal structures were analyzed by powder X-ray diffraction. Photoluminescence of these solid solutions was observed in a broad range of a visible light wavelength region under ultraviolet (UV) light excitation. The peaks of the emission band of Ca(Sn{sub 0.97}Ti{sub 0.03})SiO{sub 5} and Ca{sub 3}(Sn{sub 0.925}Ti{sub 0.075})Si{sub 2}O{sub 9} were at 510 nm under excitation of 252 nm and at 534 nm under excitation of 258 nm, respectively. The absorption edges estimated by the diffuse reflectance spectra were at 300 nm (4.1 eV) for CaSnSiO{sub 5} and at 270 nm (4.6 eV) for Ca{sub 3}SnSi{sub 2}O{sub 9}, suggesting that the excitation levels in Ca(Sn{sub 1-x}Ti{sub x})SiO{sub 5} were above the band gap of the host, although the levels in Ca{sub 3}(Sn{sub 1-y}Ti{sub y})Si{sub 2}O{sub 9} were within the band gap and near the conduction band edge.
- OSTI ID:
- 22204689
- Journal Information:
- Materials Research Bulletin, Vol. 45, Issue 4; Other Information: Copyright (c) 2010 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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