Hydrothermal growth of Zn2 SnO4 :Eu,Ca for red emission

Luminescence : the Journal of Biological and Chemical Luminescence
Krishna Sagar Chembanthodi Kuttykrishnan, Junaid Bushiri Mohammed

Abstract

Zinc stannate (Zn2 SnO4 ) and Zn2 SnO4 codoped with Eu3+ and Ca2+ (ZTO:Eu,Ca) were synthesized by hydrothermal method and characterized with X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDAX), Raman spectrometer, field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) and photoluminescence (PL) spectrophotometers. PL analysis of Zn2 SnO4 gives broad defect induced emission in the region 500-750 nm. The crystal structure of Zn2 SnO4 was retained even with a nominal doping of Eu, Ca and its combination in the Zn2 SnO4 . The Eu3+ ions were found to occupy the non-centrosymmetric sites of the Zn2 SnO4 and gave emissions at 592, 615 and 702 nm. Zn2 SnO4 :Eu,Ca showed red emission at 615 nm attributed to the electronic transition from the excited state 5 D0 → 7 F2 of the 4f6 configuration of Eu3+ . Nominal codoping of Eu3+ and Ca2+ ions promoted the quenching of orange emission from Eu3+ in Zn2 SnO4 :Eu,Ca.

References

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Jun 20, 2012·Nanotechnology·C-L ChenY Chen
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