<p>The solvent-dependent UV-visible and photoluminescence properties of aluminum quinolate complexes, such as tris(8-hydroxyquinolinato)aluminum(III) [AlQ₃], tris(2-methyl-8-hydroxyquinolinato)aluminum(III) [Al(MeQ)₃], and tris(5,7-dichloro-8-hydroxyquinolinato) aluminum(III) [Al(Cl₂Q)₃], have been investigated in detail. Density functional theory (DFT) calculations were employed to estimate the HOMO and LUMO energy levels under different solvent conditions, providing insight into the electronic structure and charge transport potential of these materials. The thermal stability of the complexes was confirmed using thermogravimetric analysis (TGA), revealing their suitability for organic electronic device applications. Atomic force microscopy (AFM) imaging of thin films deposited via vacuum thermal evaporation (10⁻⁶ Torr) demonstrated excellent film-forming properties, further supporting their application in optoelectronic devices. Transient electroluminescence (EL) studies were conducted to estimate electron mobility, which ranged from 5.67&#xa0;×&#xa0;10⁻⁵ to 1&#xa0;×&#xa0;10⁻³ cm²/V&#xa0;s under an applied electric field of 1000–1200 (V/cm)^½. Finally, organic field-effect transistors (OFETs) were fabricated using a bottom-gate, top-contact configuration on a Si/SiO₂ substrate, achieving a high on/off current ratio of&#xa0;~&#xa0;10⁵. The metal complexes Al(Cl₂Q)₃ exhibited the highest electron mobility of 9.24&#xa0;×&#xa0;10⁻³ cm²/V·s, making it a promising candidate for future organic semiconductor applications.</p> Graphical Abstract <p></p> <p>Molecular structure of aluminum complexes, Effect of solvents on photoluminescent properties and HOMO–LUMO energy gap diagram</p>