Mg1.96?1.96xZn1.96xGeO4:Mn0.04 phosphors for electroluminescent display applications
DOI: 10.1016/j.jallcom.2008.01.043
Title: Mg1.96?1.96xZn1.96xGeO4:Mn0.04 phosphors for electroluminescent display applications
Journal Title: Journal of Alloys and Compounds
Volume: 468
Publication Date: 22 January 2009
Start Page: 512
End Page: 515
Published online: online 5 March 2008
ISSN: 0925-8388
  • Optoelectronic Devices Laboratory, Department of Physics, Cochin University of Science and Technology, Kochi 682022, Kerala, India
  • Abstract: mbic magnesium germenate (Mg2GeO4) doped with manganese was synthesized by solid-state reaction technique. A broad red emission with a peak at 653 nm was observed independent of excitation wavelength. The effect of Zn incorporation on structural and optical properties is investigated, keeping the concentration of Mn fixed at 2 at.%. XRD and DRS analysis of the samples reveal the formation of a solid solution up to x = 0.10 beyond which phase segregation occurs. Formation of a sub-band gap is observed for Mn doped samples which decreased with Zn doping. Both green and red emission is observed for Zn doped samples above x = 0.10. Red emission is attributed to the 4T1 → 6A1 transition of Mn2+ at Mg2+ site in Mg2GeO4 and green emission is from 4T1 → 6A1 transition of Mn2+ at Zn2+ site of Zn2GeO4. PLE was found to be red-shifted with Zn doping.
    Accepted: 9 January 2008
    Received: 27 June 2007
    Revised: 7 January 2008
    Keywords: Mg2GeO4; Luminescence; Phosphor
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