• Uday Ghosh

Titanium dioxide (TiO₂) thin films are widely explored for optical and photocatalytic applications due to their stability, non-toxicity, and tunable electronic structure. This review clearly explains a complete analysis of recent advances in sol–gel dip-coated TiO₂ thin films, with special focus on defect-mediated photoluminescence (PL) and its interrelationship with photocatalytic performance. The sol–gel dip-coating technique allow good/specific control over film thickness, crystal structure, and defect density, which collectively control charge-carrier recombination dynamics and surface reactivity. Rather than a coincidental observation, a principal outcome of this review is the identification of the inverse PL–photocatalysis relationship as a practical materials design principle. Key challenges, unresolved issues, and future research directions for rational defect and interface engineering are discussed, and also highlighting pathways how to better control toward optimized TiO₂ thin films for environmental remediation and optoelectronic applications. This review explains annealing-temperature effects, film thickness control, atmospheric processing, and dopant-induced defect modulation, and how these factors are important for environmental remediation and optoelectronic device integration.

Titanium dioxide (TiO₂); Sol–gel dip-coated thin films; Photoluminescence (PL); Defect engineering; Charge-carrier recombination; Photocatalysis; Electronic and optoelectronic applications.

"Recent Advances in Sol–Gel Dip-Coated TiO₂ Thin Films: Defect-Mediated Photoluminescence and Photocatalytic Performance", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.13, Issue 2, page no.b111-b119, February-2026, Available :http://www.jetir.org/papers/JETIR2602115.pdf

"Recent Advances in Sol–Gel Dip-Coated TiO₂ Thin Films: Defect-Mediated Photoluminescence and Photocatalytic Performance", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.13, Issue 2, page no. ppb111-b119, February-2026, Available at : http://www.jetir.org/papers/JETIR2602115.pdf