Tunable and white emission from ZnO:Tb3+ nanophosphors for solid state lighting applications

• ZnO:Tb3+ nano-phosphors were synthesised by a solution combustion method.
• Emission bands of blue, green, and red obtained due to defect and Tb3+ transitions.
• The formation of different kind of defect is confirmed by XPS analysis.
• The emitting colour could easily be tuned from yellow to blue by varying the Tb3+.
• Near white emission was achieved for the 5 mol% of the Tb3+ doping in ZnO:Tb3+.

Terbium doped Zinc oxide (ZnO:Tb3+) nano-phosphors (NPr) with a hexagonal wurtzite structure were synthesised by a solution combustion method. X-ray photoelectron spectroscopy confirmed the formation of different kind of defects for the undoped and lower Tb doping concentrations and the formation of Tb2O3 at higher doping concentrations. A broadband orange-red emission ranging from 500 to 850 nm was obtained from the undoped ZnO while white light emission was observed from ZnO doped with 5 mol% of Tb. The colour of the emission of the ZnO:Tb3+ NPr was tuned by varying the concentrations of Tb3+ in the ZnO host. The ZnO:Tb3+ NPr have potential applications in solid state lighting.

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