This study investigates a series of bromine-substituted alkoxy biphenyl derivatives to explore their potential as
luminescent and optical materials for applications in display technologies, sensors, and photonic devices. Four
compounds were synthesized, including 5-Br, 6-Br, 7-Br, and a comparative non-halogenated molecule 6-H. The
findings reveal that the bromine-substituted derivatives exhibit enhanced thermal stability as the alkoxy chain
length increases, though none of the compounds displayed liquid crystalline phases, likely due to molecular
flexibility and steric hindrance from the bromine atoms. Photophysical studies showed that the compounds
exhibit tunable emission colors ranging from green to blue, depending on the side chain length and the presence
or absence of bromine. Importantly, the introduction of bromine was found to enhance the photophysical
properties, including increased quantum yields and longer emission lifetimes, compared to the non-halogenated
analog. Moreover, these luminescent molecules can maintain strong fluorescence both in solution and when
forming aggregates. Furthermore, the optical properties, such as dielectric constant, extinction coefficient,
refractive index, and optical conductivity, were thoroughly examined. The results indicate that structural variations,
including alkyl chain length and bromine substitution, significantly influence the capability of these
materials to store and dissipate electrical energy. Their strong optical responses, high energy storage capabilities,
and sensitivity to structural modifications suggest that the studied materials have substantial potential for applications
in energy storage, sensing, optoelectronics, and non-linear optics. These findings offer important
guidelines for the rational design of multifunctional luminescent and optical materials, representing a significant
step forward in the development of practical applications of smart materials and advanced photonic devices.