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Structural, optical, and photoluminescence properties of Zn0.95Si0.05−xFexO (0≤x≤0.05) nano-crystallites prepared by sol-gel process has been investigated thoroughly revealing enhanced red emission in co-doped samples originating from oxygen interstitials. Greater ionic charge and smaller size of the substituent ions helps generate more interstitials forming defect states within the bandgap. The correlation...