Abstract
The ZnMoO4 phosphors doped with different concentrations of Er3+ ions have been successfully synthesized by solid state reaction method. The optical properties were studied by frequency upconversion (UC) emission studies. All the prepared phosphors can be effectively excited by 980 nm and exhibit intense peak at ∼552 nm which lies in green regime. With varying the concentration of Er3+ ions the maximum frequency UC emission intensity has been observed at 0.5 mol% concentrations. In the emission spectra, the UC emission peaks at blue (∼ 489 nm), green (∼ 532 nm, ∼545 nm and 552 nm) and red (∼ 656 nm and ∼668 nm) bands are corresponding to the 4F7/2→ 4I15/2, 2H11/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3+ ions. The mechanisms involved in the UC process confirm two photon absorption process which is explored with the help of energy level diagram. The colour of the emitted radiation has been visualized with the help of choromaticity diagram with CIE point (0.31, 0.60) lie in the green colour region. This indicates that the developed Er3+:ZnMoO4 phosphors have suitable applications in NIR to visible upconverter and in making green light display devices.
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