Observation of “cool daylight” white light emission from Eu and Tb co-doped SrMoO4 nano ceramics

• Synthesis of undoped and Eu and Tb-doped and Eu–Tb co-doped Strontium Molybdate (SMO) by co-precipitation method.
• Characterization of the samples by XRD, SEM and DLS for particle size.
• Observation of orange-red emission and blue-green emission from the Eu-doped and Tb-doped samples, respectively.
• Optimization of the dopant ion concentration for white light emission from the co-doped sample.
• Observation of cool day light white light emission with CCT 6863 K from the co-doped system (Eu-0.5 mol% and Tb-1 mol%).

Nano ceramics of undoped and Eu and Tb-doped strontium molybdate (SMO) were synthesized via co-precipitation route and characterized by XRD, SEM and DLS techniques. It was observed that the average particle size for the samples was 90 nm. A bluish emission attributed to the tetrahedral molybdate moiety was observed for the undoped system. The single-doped sample Eu3+:SMO gave orange-red emission, whereas the Tb3+:SMO sample showed blue-green emission. From the emission data, the site symmetry of the ions was estimated. Based on the emission data of single-doped samples, the co-dopant ions concentrations were tuned to extract white light emission from the system. It was observed that when doped with 0.5 mol% Eu3+ and 1 mol% Tb3+ and excited with 230 nm, the system gave a ‘cool day light’ white light emission with a correlated color temperature (CCT) 6863 K.

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