Improvement of light emission of Mn-doped Zn2 SiO4 phosphors with sodium.
Mn-doped willemite (Zn2 SiO4 :Mn) green phosphor were synthesized by sol-gel technology. The effect of the addition of sodium, as in the composition Zn((1.92 - X)) Na(X) Mn(0.08) SiO4, on the emission behavior was studied. FT-IR and EPR results revealed that sodium ion is incorporated into the lattice and results in the formation of isolated Mn2+ and Mn-Mn pairs. The maximum emission intensity of the sample under ultraviolet (UV) excitation occurred at the sodium concentration of x = ~0.03. The green emission at about 525 nm is assigned to Mn2+ -Mn2+ pair centres on nearest neighbour Zn sites. The highest intensity of the green emission for x = ~0.03 is well close to the highest concentration of the Mn2+ -Mn2+ pair.
Department of Materials Engineering, Tatung University, Taipei, Taiwan, Republic of China. huyi@ttu.edu.tw
Yi
Y
Hu
Jen-Pu
JP
Yang
Jiun-Shing
JS
Liu
D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D008345:Manganese / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
D005456:Fluorescent Dyes; D017640:Silicates; D017967:Zinc Compounds; D008345:Manganese; D012964:Sodium; C029500:zinc silicate