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International Journal of Photoenergy
Volume 2013 (2013), Article ID 410613, 9 pages
Research Article

Rare Earth Free Phosphor with Controlled Microstructure and Its Photocatalytic Activity

1Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjo-1, Saga 840-8502, Japan
2Department of Bio-Engineering, Faculty of Engineering, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan

Received 9 May 2013; Accepted 4 July 2013

Academic Editor: Vincenzo Augugliaro

Copyright © 2013 Hom Nath Luitel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

The crystalline M3V2O8 (M = Zn,Mg,Ca,Sr) phase is formed at 775 oC indicating the sufficient temperature for the generation of highly crystalline M3V2O8 phases as shown in Figure S1. Further, there is the solubility of either of Zn and V ions in the Zn3V2O8 phase at least upto 10 mol% excess of the Zn or V ions as seen in the XRD profiles of different moles of Zn to V compositions shown in Figure S3. However, the PL emission intensity is enhanced only in 10 mol% V excess composition that might be due to enhanced charge transfer efficiency from excited states to ground state of V5+ ion (3T2, 3T1,→ 3A2) in the Zn3V2O8 crystal lattice.

The CIE color co-ordinate of the M3V2O8 (M=Zn,Mg,Ca,Sr) phosphors measured during black light irradiation indicating the color point in the mancell diagram is slightly varied from metal ions. Slight red shift took placed on mooving from Zn to Mg to Sr. However, the Ca3V2O8 component exhibited fairly weak emission and exhibited whitish color. With the addition of 5 mol% rare/heavy metal ions ( like Eu, Ce, Tb, Bi in Figure S4) or 10 mol% transition metal ions (Ti, Cr, Mn, Co, Cr in Figure S5) or 5 mol% ions with different charges (Na+, Ag+, Mg2+, Sr2+, Al3+, Si4+ in figure S6) did not enhance the emission brightness of the Zn3V2O8 phosphor. All these ions substitution into the Zn3V2O8 host decreased the PL intensity.

  1. Supplementary Materials