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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...
ZnO is known to have oxygen vacancies which count for green emission. The oxygen deficient ZnO system has a bandgap of 3.12eV with an Urbach tail of 0.083eV which hints at structural irregularities in the material. This inherent property of oxygen deficiency is reduced by substituting with Si4+, most probably due to the extra charge on the substituent ions, improving the structural regularity and...
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