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MANGANESE ACTIVATED (2-x)ZnOxCdO1.1SiO2 PHOSPHORS OBTAINED BY SOLID STATE SYNTHESIS

C. Enache1,* , R. Turcin2, C. Savii1, M. Popovici1, R. M. Jurca3, V. Socoliuc4

Affiliation

  1. Institute of Chemistry Timisoara of the Romanian Academy, Timi oara, Mihai Viteazu Blvd. 24, RO-1900 Timi oara, Romania
  2. National Institute for R&D in Electrochemistry and Condensed Matter, 2 Tarnava St., RO 1900 Timisoara, Romania
  3. “Politehnica” University of Timisoara, Faculty of Industrial Chemistry and Environmental Engineering, 2 Victoriei Plaza, RO-1900 Timisoara, Romania
  4. National Institute for R&D in Electrochemistry and Condensed Matter, 2 Tarnava St., RO 1900 Timisoara, Romania

Abstract

The aim of the work was to study the evolution of luminescence emission properties of some Mn2+ activated phosphors in the ZnO – CdO – SiO2 system in correlation with both the cadmium oxide/zinc oxide mole ratio and the activator concentration. A number of phosphors corresponding to the mole target composition of (2-x)ZnOxCdO1.1SiO2:yMn, where 0 £ x £ 0.15, and y = 0.021; 0.042; 0.085, were obtained by firing the mixed powders of precursors (oxides and carbonates), at 1250 ºC or 1350ºC temperatures, in air, for 60 minutes. Thermal analysis technique was used in order to elucidate the oxide system behaviour during thermal treatment. Structural and optical properties were investigated by X-ray diffraction and spectrofluorometry techniques All obtained samples show a green luminescence emission, as it was expected for manganese-activated willemite. The emission intensity of the synthesised phosphors seems to be influenced by host matrix composition and activator amount, as well. It was observed that, in the domain of relatively low CdO/ZnO mole ratio, regardless the activator concentration, the emission intensity is favourable influenced by CdO content, the maximum being reached for the composition 1.975ZnO0.025CdO1.1SiO20.085Mn..

Keywords

Willemite, Zinc cadmium silicate, Manganese (II) activator, Green phosphors.

Submitted at: Oct. 10, 2002
Accepted at: March 12, 2003

Citation

C. Enache, R. Turcin, C. Savii, M. Popovici, R. M. Jurca, V. Socoliuc, MANGANESE ACTIVATED (2-x)ZnOxCdO1.1SiO2 PHOSPHORS OBTAINED BY SOLID STATE SYNTHESIS, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 305-311 (2003)